.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) 1998 - 2017, 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 7.52.0" "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 This option is for connecting to an HTTPS proxy, not an HTTPS server. Pass a char * to a zero terminated string naming a file holding one or more certificates to verify the HTTPS proxy with. If \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP is zero and you avoid verifying the server's certificate, \fICURLOPT_PROXY_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. The application does not have to keep the string around after setting this option. .SH DEFAULT Built-in system specific .SH PROTOCOLS Used with HTTPS proxy .SH EXAMPLE .nf CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); /* using an HTTPS proxy */ curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:443"); curl_easy_setopt(curl, CURLOPT_PROXY_CAINFO, "/etc/certs/cabundle.pem"); ret = curl_easy_perform(curl); curl_easy_cleanup(curl); } .fi .SH AVAILABILITY Added in 7.52.0 For TLS backends that don't support certificate files, the \fICURLOPT_PROXY_CAINFO(3)\fP 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_PROXY_CAPATH "(3), " .BR CURLOPT_PROXY_SSL_VERIFYPEER "(3), " CURLOPT_PROXY_SSL_VERIFYHOST "(3), " .BR CURLOPT_CAPATH "(3), " .BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "