proxy: Support HTTPS proxy and SOCKS+HTTP(s)

* HTTPS proxies:

An HTTPS proxy receives all transactions over an SSL/TLS connection.
Once a secure connection with the proxy is established, the user agent
uses the proxy as usual, including sending CONNECT requests to instruct
the proxy to establish a [usually secure] TCP tunnel with an origin
server. HTTPS proxies protect nearly all aspects of user-proxy
communications as opposed to HTTP proxies that receive all requests
(including CONNECT requests) in vulnerable clear text.

With HTTPS proxies, it is possible to have two concurrent _nested_
SSL/TLS sessions: the "outer" one between the user agent and the proxy
and the "inner" one between the user agent and the origin server
(through the proxy). This change adds supports for such nested sessions
as well.

A secure connection with a proxy requires its own set of the usual SSL
options (their actual descriptions differ and need polishing, see TODO):

  --proxy-cacert FILE        CA certificate to verify peer against
  --proxy-capath DIR         CA directory to verify peer against
  --proxy-cert CERT[:PASSWD] Client certificate file and password
  --proxy-cert-type TYPE     Certificate file type (DER/PEM/ENG)
  --proxy-ciphers LIST       SSL ciphers to use
  --proxy-crlfile FILE       Get a CRL list in PEM format from the file
  --proxy-insecure           Allow connections to proxies with bad certs
  --proxy-key KEY            Private key file name
  --proxy-key-type TYPE      Private key file type (DER/PEM/ENG)
  --proxy-pass PASS          Pass phrase for the private key
  --proxy-ssl-allow-beast    Allow security flaw to improve interop
  --proxy-sslv2              Use SSLv2
  --proxy-sslv3              Use SSLv3
  --proxy-tlsv1              Use TLSv1
  --proxy-tlsuser USER       TLS username
  --proxy-tlspassword STRING TLS password
  --proxy-tlsauthtype STRING TLS authentication type (default SRP)

All --proxy-foo options are independent from their --foo counterparts,
except --proxy-crlfile which defaults to --crlfile and --proxy-capath
which defaults to --capath.

Curl now also supports %{proxy_ssl_verify_result} --write-out variable,
similar to the existing %{ssl_verify_result} variable.

Supported backends: OpenSSL, GnuTLS, and NSS.

* A SOCKS proxy + HTTP/HTTPS proxy combination:

If both --socks* and --proxy options are given, Curl first connects to
the SOCKS proxy and then connects (through SOCKS) to the HTTP or HTTPS
proxy.

TODO: Update documentation for the new APIs and --proxy-* options.
Look for "Added in 7.XXX" marks.

20 files changed, 1164 insertions, 0 deletions

diff --git a/docs/libcurl/opts/CURLINFO_PROXY_SSL_VERIFYRESULT.3 b/docs/libcurl/opts/CURLINFO_PROXY_SSL_VERIFYRESULT.3
new file mode 100644
index 000000000..8f09df5c4
--- /dev/null
+++ b/docs/libcurl/opts/CURLINFO_PROXY_SSL_VERIFYRESULT.3
@@ -0,0 +1,44 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLINFO_PROXY_SSL_VERIFYRESULT 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_getinfo options"
+.SH NAME
+CURLINFO_PROXY_SSL_VERIFYRESULT \- get the result of the proxy certification verification
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PROXY_SSL_VERIFYRESULT, long *result);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a pointer to a long to receive the result of the certification
+verification that was requested (using the \fICURLOPT_SSL_VERIFYPEER(3)\fP
+option.
+.SH PROTOCOLS
+All using TLS
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+Added in 7.5
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_CAINFO.3 b/docs/libcurl/opts/CURLOPT_PROXY_CAINFO.3
new file mode 100644
index 000000000..31fc562e8
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_CAINFO.3
@@ -0,0 +1,64 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_CAINFO 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_CAINFO \- path to proxy Certificate Authority (CA) bundle
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAINFO, char *path);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a char * to a zero terminated string naming a file holding one or more
+certificates to verify the peer with.
+
+If \fICURLOPT_SSL_VERIFYPEER(3)\fP is zero and you avoid verifying the
+server's certificate, \fICURLOPT_CAINFO(3)\fP need not even indicate an
+accessible file.
+
+This option is by default set to the system path where libcurl's cacert bundle
+is assumed to be stored, as established at build time.
+
+If curl is built against the NSS SSL library, the NSS PEM PKCS#11 module
+(libnsspem.so) needs to be available for this option to work properly.
+
+(iOS and macOS only) If curl is built against Secure Transport, then this
+option is supported for backward compatibility with other SSL engines, but it
+should not be set. If the option is not set, then curl will use the
+certificates in the system and user Keychain to verify the peer, which is the
+preferred method of verifying the peer's certificate chain.
+.SH DEFAULT
+Built-in system specific
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+For SSL engines that don't support certificate files the CURLOPT_PROXY_CAINFO option
+is ignored. Refer to https://curl.haxx.se/docs/ssl-compared.html
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_CAPATH "(3), "
+.BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_CAPATH.3 b/docs/libcurl/opts/CURLOPT_PROXY_CAPATH.3
new file mode 100644
index 000000000..7c984538a
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_CAPATH.3
@@ -0,0 +1,54 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_CAPATH 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_CAPATH \- specify directory holding proxy CA certificates
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAPATH, char *capath);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a char * to a zero terminated string naming a directory holding multiple
+CA certificates to verify the peer with. If libcurl is built against OpenSSL,
+the certificate directory must be prepared using the openssl c_rehash utility.
+This makes sense only when used in combination with the
+\fICURLOPT_SSL_VERIFYPEER(3)\fP option.
+
+The \fICURLOPT_CAPATH(3)\fP function apparently does not work in Windows due
+to some limitation in openssl.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+This option is supported by the OpenSSL, GnuTLS and PolarSSL backends. The NSS
+backend provides the option only for backward compatibility.
+.SH RETURN VALUE
+Returns CURLE_OK if TLS enabled, and CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_CAINFO "(3), "
+.BR CURLOPT_STDERR "(3), " CURLOPT_DEBUGFUNCTION "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_CRLFILE.3 b/docs/libcurl/opts/CURLOPT_PROXY_CRLFILE.3
new file mode 100644
index 000000000..956cc5691
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_CRLFILE.3
@@ -0,0 +1,61 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_CRLFILE 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_CRLFILE \- specify a proxy Certificate Revocation List file
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CRLFILE, char *file);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a char * to a zero terminated string naming a \fIfile\fP with the
+concatenation of CRL (in PEM format) to use in the certificate validation that
+occurs during the SSL exchange.
+
+When curl is built to use NSS or GnuTLS, there is no way to influence the use
+of CRL passed to help in the verification process. When libcurl is built with
+OpenSSL support, X509_V_FLAG_CRL_CHECK and X509_V_FLAG_CRL_CHECK_ALL are both
+set, requiring CRL check against all the elements of the certificate chain if
+a CRL file is passed.
+
+This option makes sense only when used in combination with the
+\fICURLOPT_SSL_VERIFYPEER(3)\fP option.
+
+A specific error code (\fICURLE_SSL_CRL_BADFILE\fP) is defined with the
+option. It is returned when the SSL exchange fails because the CRL file cannot
+be loaded.  A failure in certificate verification due to a revocation
+information found in the CRL does not trigger this specific error.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS-based protocols
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+Added in 7.51.1
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_KEYPASSWD.3 b/docs/libcurl/opts/CURLOPT_PROXY_KEYPASSWD.3
new file mode 100644
index 000000000..5f328020e
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_KEYPASSWD.3
@@ -0,0 +1,46 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_KEYPASSWD 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_KEYPASSWD \- set passphrase to proxy private key
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_KEYPASSWD, char *pwd);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a pointer to a zero terminated string as parameter. It will be used as
+the password required to use the \fICURLOPT_SSLKEY(3)\fP or
+\fICURLOPT_SSH_PRIVATE_KEYFILE(3)\fP private key.  You never needed a pass
+phrase to load a certificate but you need one to load your private key.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH RETURN VALUE
+Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_SSLKEY "(3), " CURLOPT_SSH_PRIVATE_KEYFILE "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLCERT.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERT.3
new file mode 100644
index 000000000..8ce38592d
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERT.3
@@ -0,0 +1,56 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSLCERT 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSLCERT \- set SSL proxy client certificate
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERT, char *cert);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a pointer to a zero terminated string as parameter. The string should be
+the file name of your client certificate. The default format is "P12" on
+Secure Transport and "PEM" on other engines, and can be changed with
+\fICURLOPT_SSLCERTTYPE(3)\fP.
+
+With NSS or Secure Transport, this can also be the nickname of the certificate
+you wish to authenticate with as it is named in the security database. If you
+want to use a file from the current directory, please precede it with "./"
+prefix, in order to avoid confusion with a nickname.
+
+When using a client certificate, you most likely also need to provide a
+private key with \fICURLOPT_SSLKEY(3)\fP.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+If built TLS enabled.
+.SH RETURN VALUE
+Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_SSLCERTTYPE "(3), " CURLOPT_SSLKEY "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLCERTTYPE.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERTTYPE.3
new file mode 100644
index 000000000..297cc0c30
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERTTYPE.3
@@ -0,0 +1,49 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSLCERTTYPE 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSLCERTTYPE \- specify type of the proxy client SSL certificate
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERTTYPE, char *type);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a pointer to a zero terminated string as parameter. The string should be
+the format of your certificate. Supported formats are "PEM" and "DER", except
+with Secure Transport. OpenSSL (versions 0.9.3 and later) and Secure Transport
+(on iOS 5 or later, or OS X 10.7 or later) also support "P12" for
+PKCS#12-encoded files.
+.SH DEFAULT
+"PEM"
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+If built TLS enabled.
+.SH RETURN VALUE
+Returns CURLE_OK if TLS is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_SSLCERT "(3), " CURLOPT_SSLKEY "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLKEY.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEY.3
new file mode 100644
index 000000000..6301ae8f4
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEY.3
@@ -0,0 +1,51 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSLKEY 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSLKEY \- specify private keyfile for TLS and SSL proxy client cert
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEY, char *keyfile);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a pointer to a zero terminated string as parameter. The string should be
+the file name of your private key. The default format is "PEM" and can be
+changed with \fICURLOPT_SSLKEYTYPE(3)\fP.
+
+(iOS and Mac OS X only) This option is ignored if curl was built against
+Secure Transport. Secure Transport expects the private key to be already
+present in the keychain or PKCS#12 file containing the certificate.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+If built TLS enabled.
+.SH RETURN VALUE
+Returns CURLE_OK if TLS is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_SSLKEYTYPE "(3), " CURLOPT_SSLCERT "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLKEYTYPE.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEYTYPE.3
new file mode 100644
index 000000000..8c81b49f0
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEYTYPE.3
@@ -0,0 +1,51 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSLKEYTYPE 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSLKEYTYPE \- set type of the proxy private key file
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEYTYPE, char *type);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a pointer to a zero terminated string as parameter. The string should be
+the format of your private key. Supported formats are "PEM", "DER" and "ENG".
+
+The format "ENG" enables you to load the private key from a crypto engine. In
+this case \fICURLOPT_SSLKEY(3)\fP is used as an identifier passed to the
+engine. You have to set the crypto engine with \fICURLOPT_SSLENGINE(3)\fP.
+\&"DER" format key file currently does not work because of a bug in OpenSSL.
+.SH DEFAULT
+"PEM"
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+If built TLS enabled.
+.SH RETURN VALUE
+Returns CURLE_OK if TLS is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_SSLKEY "(3), " CURLOPT_SSLCERT "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLVERSION.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLVERSION.3
new file mode 100644
index 000000000..ef65b169c
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLVERSION.3
@@ -0,0 +1,81 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSLVERSION 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSLVERSION \- set proxy preferred TLS/SSL version
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLVERSION, long version);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a long as parameter to control which version of SSL/TLS to attempt to
+use.
+
+Use one of the available defines for this purpose. The available options are:
+.RS
+.IP CURL_SSLVERSION_DEFAULT
+The default action. This will attempt to figure out the remote SSL protocol
+version.
+.IP CURL_SSLVERSION_TLSv1
+TLSv1.x
+.IP CURL_SSLVERSION_SSLv2
+SSLv2
+.IP CURL_SSLVERSION_SSLv3
+SSLv3
+.IP CURL_SSLVERSION_TLSv1_0
+TLSv1.0 (Added in 7.34.0)
+.IP CURL_SSLVERSION_TLSv1_1
+TLSv1.1 (Added in 7.34.0)
+.IP CURL_SSLVERSION_TLSv1_2
+TLSv1.2 (Added in 7.34.0)
+.IP CURL_SSLVERSION_TLSv1_3
+TLSv1.3 (Added in 7.51.1)
+.RE
+.SH DEFAULT
+CURL_SSLVERSION_DEFAULT
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+
+  /* ask libcurl to use TLS version 1.0 or later */
+  curl_easy_setopt(curl, CURLOPT_PROXY_SSLVERSION, CURL_SSLVERSION_TLSv1);
+
+  /* Perform the request */
+  curl_easy_perform(curl);
+}
+.fi
+.SH AVAILABILITY
+SSLv2 is disabled by default since 7.18.1. Other SSL versions availability may
+vary depending on which backend libcurl has been built to use.
+
+SSLv3 is disabled by default since 7.39.0.
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_USE_SSL "(3), " CURLOPT_HTTP_VERSION "(3), "
+.BR CURLOPT_IPRESOLVE "(3) "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSL_CIPHER_LIST.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSL_CIPHER_LIST.3
new file mode 100644
index 000000000..a7cbc6af7
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSL_CIPHER_LIST.3
@@ -0,0 +1,66 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSL_CIPHER_LIST 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSL_CIPHER_LIST \- specify ciphers to use for proxy TLS
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_CIPHER_LIST, char *list);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a char *, pointing to a zero terminated string holding the list of
+ciphers to use for the SSL connection. The list must be syntactically correct,
+it consists of one or more cipher strings separated by colons. Commas or
+spaces are also acceptable separators but colons are normally used, \&!, \&-
+and \&+ can be used as operators.
+
+For OpenSSL and GnuTLS valid examples of cipher lists include 'RC4-SHA',
+\'SHA1+DES\', 'TLSv1' and 'DEFAULT'. The default list is normally set when you
+compile OpenSSL.
+
+You'll find more details about cipher lists on this URL:
+
+ https://www.openssl.org/docs/apps/ciphers.html
+
+For NSS, valid examples of cipher lists include 'rsa_rc4_128_md5',
+\'rsa_aes_128_sha\', etc. With NSS you don't add/remove ciphers. If one uses
+this option then all known ciphers are disabled and only those passed in are
+enabled.
+
+You'll find more details about the NSS cipher lists on this URL:
+
+ http://git.fedorahosted.org/cgit/mod_nss.git/plain/docs/mod_nss.html#Directives
+.SH DEFAULT
+NULL, use internal default
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+If built TLS enabled.
+.SH RETURN VALUE
+Returns CURLE_OK if TLS is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_SSLVERSION "(3), " CURLOPT_USE_SSL "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSL_OPTIONS.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSL_OPTIONS.3
new file mode 100644
index 000000000..6b4cbaeb4
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSL_OPTIONS.3
@@ -0,0 +1,62 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSL_OPTIONS 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSL_OPTIONS \- set proxy SSL behavior options
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_OPTIONS, long bitmask);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a long with a bitmask to tell libcurl about specific SSL behaviors.
+
+\fICURLSSLOPT_ALLOW_BEAST\fP tells libcurl to not attempt to use any
+workarounds for a security flaw in the SSL3 and TLS1.0 protocols.  If this
+option isn't used or this bit is set to 0, the SSL layer libcurl uses may use a
+work-around for this flaw although it might cause interoperability problems
+with some (older) SSL implementations. WARNING: avoiding this work-around
+lessens the security, and by setting this option to 1 you ask for exactly that.
+This option is only supported for DarwinSSL, NSS and OpenSSL.
+
+Added in 7.44.0:
+
+\fICURLSSLOPT_NO_REVOKE\fP tells libcurl to disable certificate revocation
+checks for those SSL backends where such behavior is present. \fBCurrently this
+option is only supported for WinSSL (the native Windows SSL library), with an
+exception in the case of Windows' Untrusted Publishers blacklist which it seems
+can't be bypassed.\fP This option may have broader support to accommodate other
+SSL backends in the future.
+https://curl.haxx.se/docs/ssl-compared.html
+
+
+.SH DEFAULT
+0
+.SH PROTOCOLS
+All TLS-based protocols
+.SH EXAMPLE
+TODO
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_SSLVERSION "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSL_VERIFYHOST.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSL_VERIFYHOST.3
new file mode 100644
index 000000000..9a0d69ab6
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSL_VERIFYHOST.3
@@ -0,0 +1,88 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSL_VERIFYHOST 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSL_VERIFYHOST \- verify the proxy certificate's name against host
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYHOST, long verify);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a long as parameter specifying what to \fIverify\fP.
+
+This option determines whether libcurl verifies that the server cert is for
+the server it is known as.
+
+When negotiating TLS and SSL connections, the server sends a certificate
+indicating its identity.
+
+When \fICURLOPT_SSL_VERIFYHOST(3)\fP is 2, that certificate must indicate that
+the server is the server to which you meant to connect, or the connection
+fails. Simply put, it means it has to have the same name in the certificate as
+is in the URL you operate against.
+
+Curl considers the server the intended one when the Common Name field or a
+Subject Alternate Name field in the certificate matches the host name in the
+URL to which you told Curl to connect.
+
+When the \fIverify\fP value is 1, \fIcurl_easy_setopt\fP will return an error
+and the option value will not be changed.  It was previously (in 7.28.0 and
+earlier) a debug option of some sorts, but it is no longer supported due to
+frequently leading to programmer mistakes. Future versions will stop returning
+an error for 1 and just treat 1 and 2 the same.
+
+When the \fIverify\fP value is 0, the connection succeeds regardless of the
+names in the certificate. Use that ability with caution!
+
+The default value for this option is 2.
+
+This option controls checking the server's certificate's claimed identity.
+The server could be lying.  To control lying, see
+\fICURLOPT_SSL_VERIFYPEER(3)\fP.  If libcurl is built against NSS and
+\fICURLOPT_SSL_VERIFYPEER(3)\fP is zero, \fICURLOPT_SSL_VERIFYHOST(3)\fP is
+also set to zero and cannot be overridden.
+.SH DEFAULT
+2
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+
+  /* Set the default value: strict name check please */
+  curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYHOST, 2L);
+
+  curl_easy_perform(curl);
+}
+.fi
+.SH AVAILABILITY
+If built TLS enabled.
+.SH RETURN VALUE
+Returns CURLE_OK if TLS is supported, and CURLE_UNKNOWN_OPTION if not.
+
+If 1 is set as argument, \fICURLE_BAD_FUNCTION_ARGUMENT\fP is returned.
+.SH "SEE ALSO"
+.BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_CAINFO "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSL_VERIFYPEER.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSL_VERIFYPEER.3
new file mode 100644
index 000000000..294c77b37
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSL_VERIFYPEER.3
@@ -0,0 +1,82 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_SSL_VERIFYPEER 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_SSL_VERIFYPEER \- verify the proxy peer's SSL certificate
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYPEER, long verify);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a long as parameter to enable or disable.
+
+This option determines whether curl verifies the authenticity of the peer's
+certificate. A value of 1 means curl verifies; 0 (zero) means it doesn't.
+
+When negotiating a TLS or SSL connection, the server sends a certificate
+indicating its identity.  Curl verifies whether the certificate is authentic,
+i.e. that you can trust that the server is who the certificate says it is.
+This trust is based on a chain of digital signatures, rooted in certification
+authority (CA) certificates you supply.  curl uses a default bundle of CA
+certificates (the path for that is determined at build time) and you can
+specify alternate certificates with the \fICURLOPT_CAINFO(3)\fP option or the
+\fICURLOPT_CAPATH(3)\fP option.
+
+When \fICURLOPT_SSL_VERIFYPEER(3)\fP is enabled, and the verification fails to
+prove that the certificate is authentic, the connection fails.  When the
+option is zero, the peer certificate verification succeeds regardless.
+
+Authenticating the certificate is not enough to be sure about the server. You
+typically also want to ensure that the server is the server you mean to be
+talking to.  Use \fICURLOPT_SSL_VERIFYHOST(3)\fP for that. The check that the
+host name in the certificate is valid for the host name you're connecting to
+is done independently of the \fICURLOPT_SSL_VERIFYPEER(3)\fP option.
+
+WARNING: disabling verification of the certificate allows bad guys to
+man-in-the-middle the communication without you knowing it. Disabling
+verification makes the communication insecure. Just having encryption on a
+transfer is not enough as you cannot be sure that you are communicating with
+the correct end-point.
+.SH DEFAULT
+By default, curl assumes a value of 1.
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+
+  /* Set the default value: strict certificate check please */
+  curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYPEER, 1L);
+
+  curl_easy_perform(curl);
+}
+.fi
+.SH AVAILABILITY
+If built TLS enabled.
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_SSL_VERIFYHOST "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_PASSWORD.3 b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_PASSWORD.3
new file mode 100644
index 000000000..ed2544bd1
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_PASSWORD.3
@@ -0,0 +1,48 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_TLSAUTH_PASSWORD 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_TLSAUTH_PASSWORD \- password to use for proxy TLS authentication
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_PASSWORD, char *pwd);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a char * as parameter, which should point to the zero terminated password
+to use for the TLS authentication method specified with the
+\fICURLOPT_TLSAUTH_TYPE(3)\fP option. Requires that the
+\fICURLOPT_TLSAUTH_USERNAME(3)\fP option also be set.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS-based protocols
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+Added in 7.21.4
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_TLSAUTH_TYPE "(3), " CURLOPT_TLSAUTH_USERNAME "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_TYPE.3 b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_TYPE.3
new file mode 100644
index 000000000..f30256ab7
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_TYPE.3
@@ -0,0 +1,53 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_TLSAUTH_TYPE 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_TLSAUTH_TYPE \- set proxy TLS authentication methods
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_TYPE, char *type);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a pointer to a zero terminated string as parameter. The string
+should be the method of the TLS authentication. Supported method is "SRP".
+
+.IP SRP
+TLS-SRP authentication. Secure Remote Password authentication for TLS is
+defined in RFC5054 and provides mutual authentication if both sides have a
+shared secret. To use TLS-SRP, you must also set the
+\fICURLOPT_TLSAUTH_USERNAME(3)\fP and \fICURLOPT_TLSAUTH_PASSWORD(3)\fP
+options.
+.SH DEFAULT
+blank
+.SH PROTOCOLS
+All TLS-based protocols
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+You need to build libcurl with GnuTLS or OpenSSL with TLS-SRP support for this
+to work.
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_TLSAUTH_USERNAME "(3), " CURLOPT_TLSAUTH_PASSWORD "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_USERNAME.3 b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_USERNAME.3
new file mode 100644
index 000000000..53c8378a4
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_USERNAME.3
@@ -0,0 +1,46 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_PROXY_TLSAUTH_USERNAME 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_PROXY_TLSAUTH_USERNAME \- user name to use for proxy TLS authentication
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_USERNAME, char *user);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a char * as parameter, which should point to the zero terminated username
+to use for the TLS authentication method specified with the
+\fICURLOPT_TLSAUTH_TYPE(3)\fP option. Requires that the
+\fICURLOPT_TLSAUTH_PASSWORD(3)\fP option also be set.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS-based protocols
+.SH EXAMPLE
+TODO
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_TLSAUTH_TYPE "(3), " CURLOPT_TLSAUTH_PASSWORD "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_SOCKS_PROXY.3 b/docs/libcurl/opts/CURLOPT_SOCKS_PROXY.3
new file mode 100644
index 000000000..bddb40a18
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_SOCKS_PROXY.3
@@ -0,0 +1,88 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SOCKS_PROXY 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_SOCKS_PROXY \- set socks proxy to use
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS_PROXY, char *proxy);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Set the \fIproxy\fP to use for the upcoming request. The parameter should be a
+char * to a zero terminated string holding the host name or dotted numerical
+IP address. A numerical IPv6 address must be written within [brackets].
+
+To specify port number in this string, append :[port] to the end of the host
+name. The proxy's port number may optionally be specified with the separate
+option \fICURLOPT_PROXYPORT(3)\fP. If not specified, libcurl will default to
+using port 1080 for proxies.
+
+The proxy string may be prefixed with [scheme]:// to specify which kind of
+proxy is used. Use socks4://, socks4a://, socks5:// or socks5h:// (the last
+one to enable socks5 and asking the proxy to do the resolving, also known as
+\fICURLPROXY_SOCKS5_HOSTNAME\fP type) to request the specific SOCKS version to
+be used. No scheme specified or http://, will be treated as HTTP proxies.
+
+Without a scheme prefix, \fICURLOPT_PROXYTYPE(3)\fP can be used to specify
+which kind of proxy the string identifies.
+
+When you tell the library to use a HTTP proxy, libcurl will transparently
+convert operations to HTTP even if you specify an FTP URL etc. This may have
+an impact on what other features of the library you can use, such as
+\fICURLOPT_QUOTE(3)\fP and similar FTP specifics that don't work unless you
+tunnel through the HTTP proxy. Such tunneling is activated with
+\fICURLOPT_HTTPPROXYTUNNEL(3)\fP.
+
+libcurl respects the environment variables \fBhttp_proxy\fP, \fBftp_proxy\fP,
+\fBall_proxy\fP etc, if any of those are set. The \fICURLOPT_PROXY(3)\fP
+option does however override any possibly set environment variables.
+
+Setting the proxy string to "" (an empty string) will explicitly disable the
+use of a proxy, even if there is an environment variable set for it.
+
+A proxy host string can also include protocol scheme (http://) and embedded
+user + password.
+.SH DEFAULT
+Default is NULL, meaning no proxy is used.
+
+When you set a host name to use, do not assume that there's any particular
+single port number used widely for proxies. Specify it!
+.SH PROTOCOLS
+All except file://. Note that some protocols don't do very well over proxy.
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+Since 7.14.1 the proxy environment variable names can include the protocol
+scheme.
+
+Since 7.21.7 the proxy string supports the socks protocols as "schemes".
+
+Since 7.50.2, unsupported schemes in proxy strings cause libcurl to return
+error.
+.SH RETURN VALUE
+Returns CURLE_OK if proxies are supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_PROXYPORT "(3), " CURLOPT_HTTPPROXYTUNNEL "(3), "
+.BR CURLOPT_PROXYTYPE "(3)"
diff --git a/docs/libcurl/opts/CURLOPT_SOCKS_PROXYTYPE.3 b/docs/libcurl/opts/CURLOPT_SOCKS_PROXYTYPE.3
new file mode 100644
index 000000000..789bfb877
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_SOCKS_PROXYTYPE.3
@@ -0,0 +1,55 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SOCKS_PROXYTYPE 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_SOCKS_PROXYTYPE \- socks proxy protocol type
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS_PROXYTYPE, long type);
+.SH DESCRIPTION
+TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
+Pass a long with this option to set type of the proxy. Available options for
+this are \fICURLPROXY_HTTP\fP, \fICURLPROXY_HTTP_1_0\fP
+\fICURLPROXY_SOCKS4\fP, \fICURLPROXY_SOCKS5\fP, \fICURLPROXY_SOCKS4A\fP and
+\fICURLPROXY_SOCKS5_HOSTNAME\fP. The HTTP type is default.
+
+If you set \fICURLOPT_PROXYTYPE(3)\fP to \fICURLPROXY_HTTP_1_0\fP, it will
+only affect how libcurl speaks to a proxy when CONNECT is used. The HTTP
+version used for "regular" HTTP requests is instead controlled with
+\fICURLOPT_HTTP_VERSION(3)\fP.
+
+Often it is more convenient to specify the proxy type with the scheme part of
+the \fICURLOPT_PROXY(3)\fP string.
+.SH DEFAULT
+CURLPROXY_HTTP
+.SH PROTOCOLS
+Most
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+Always
+.SH RETURN VALUE
+Returns CURLE_OK
+.SH "SEE ALSO"
+.BR CURLOPT_PROXY "(3), " CURLOPT_PROXYPORT "(3), "
diff --git a/docs/libcurl/opts/Makefile.am b/docs/libcurl/opts/Makefile.am
index 8cb1b52b8..1ef4f2bc1 100644
--- a/docs/libcurl/opts/Makefile.am
+++ b/docs/libcurl/opts/Makefile.am
@@ -49,6 +49,7 @@ man_MANS =                                      \
  CURLINFO_PRIMARY_IP.3                          \
  CURLINFO_PRIMARY_PORT.3                        \
  CURLINFO_PRIVATE.3                             \
+ CURLINFO_PROXY_SSL_VERIFYRESULT.3              \
  CURLINFO_PROXYAUTH_AVAIL.3                     \
  CURLINFO_REDIRECT_COUNT.3                      \
  CURLINFO_REDIRECT_TIME.3                       \
@@ -223,6 +224,24 @@ man_MANS =                                      \
  CURLOPT_PROXYUSERPWD.3                         \
  CURLOPT_PROXY_SERVICE_NAME.3                   \
  CURLOPT_PROXY_TRANSFER_MODE.3                  \
+ CURLOPT_PROXY_CAINFO.3                         \
+ CURLOPT_PROXY_CAPATH.3                         \
+ CURLOPT_PROXY_CRLFILE.3                        \
+ CURLOPT_PROXY_KEYPASSWD.3                      \
+ CURLOPT_PROXY_SSLCERT.3                        \
+ CURLOPT_PROXY_SSLCERTTYPE.3                    \
+ CURLOPT_PROXY_SSLKEY.3                         \
+ CURLOPT_PROXY_SSLKEYTYPE.3                     \
+ CURLOPT_PROXY_SSLVERSION.3                     \
+ CURLOPT_PROXY_SSL_CIPHER_LIST.3                \
+ CURLOPT_PROXY_SSL_OPTIONS.3                    \
+ CURLOPT_PROXY_SSL_VERIFYHOST.3                 \
+ CURLOPT_PROXY_SSL_VERIFYPEER.3                 \
+ CURLOPT_PROXY_TLSAUTH_PASSWORD.3               \
+ CURLOPT_PROXY_TLSAUTH_TYPE.3                   \
+ CURLOPT_PROXY_TLSAUTH_USERNAME.3               \
+ CURLOPT_SOCKS_PROXY.3                          \
+ CURLOPT_SOCKS_PROXYTYPE.3                      \
  CURLOPT_PUT.3                                  \
  CURLOPT_QUOTE.3                                \
  CURLOPT_RANDOM_FILE.3                          \