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authorDaniel Stenberg <daniel@haxx.se>2019-04-14 23:20:01 +0200
committerDaniel Stenberg <daniel@haxx.se>2019-04-21 23:06:23 +0200
commite649432e7234dfe6905f4663bd0ce7b37ef2c5e7 (patch)
treeec343333607d509a68fa8ad74cdb9833c1f380ba /docs
parent060f870b85a6ee85668caeb791935fe98f4da56d (diff)
CURLOPT_MAXAGE_CONN: set the maximum allowed age for conn reuse
... and disconnect too old ones instead of trying to reuse. Default max age is set to 118 seconds. Ref: #3722 Closes #3782
Diffstat (limited to 'docs')
-rw-r--r--docs/TODO11
-rw-r--r--docs/libcurl/curl_easy_setopt.32
-rw-r--r--docs/libcurl/opts/CURLOPT_MAXAGE_CONN.365
-rw-r--r--docs/libcurl/opts/Makefile.inc1
-rw-r--r--docs/libcurl/symbols-in-versions1
5 files changed, 69 insertions, 11 deletions
diff --git a/docs/TODO b/docs/TODO
index c51a90206..912eefc1a 100644
--- a/docs/TODO
+++ b/docs/TODO
@@ -35,7 +35,6 @@
1.16 Try to URL encode given URL
1.17 Add support for IRIs
1.18 try next proxy if one doesn't work
- 1.19 Timeout idle connections from the pool
1.20 SRV and URI DNS records
1.21 Have the URL API offer IDN decoding
1.22 CURLINFO_PAUSE_STATE
@@ -373,16 +372,6 @@
https://github.com/curl/curl/issues/896
-1.19 Timeout idle connections from the pool
-
- libcurl currently keeps connections in its connection pool for an indefinite
- period of time, until it either gets reused, gets noticed that it has been
- closed by the server or gets pruned to make room for a new connection.
-
- To reduce overhead (especially for when we add monitoring of the connections
- in the pool), we should introduce a timeout so that connections that have
- been idle for N seconds get closed.
-
1.20 SRV and URI DNS records
Offer support for resolving SRV and URI DNS records for libcurl to know which
diff --git a/docs/libcurl/curl_easy_setopt.3 b/docs/libcurl/curl_easy_setopt.3
index fc361d80c..1f18a3494 100644
--- a/docs/libcurl/curl_easy_setopt.3
+++ b/docs/libcurl/curl_easy_setopt.3
@@ -468,6 +468,8 @@ Maximum number of connections in the connection pool. See \fICURLOPT_MAXCONNECTS
Use a new connection. \fICURLOPT_FRESH_CONNECT(3)\fP
.IP CURLOPT_FORBID_REUSE
Prevent subsequent connections from re-using this. See \fICURLOPT_FORBID_REUSE(3)\fP
+.IP CURLOPT_MAXAGE_CONN
+Limit the age of connections for reuse. See \fICURLOPT_MAXAGE_CONN(3)\fP
.IP CURLOPT_CONNECTTIMEOUT
Timeout for the connection phase. See \fICURLOPT_CONNECTTIMEOUT(3)\fP
.IP CURLOPT_CONNECTTIMEOUT_MS
diff --git a/docs/libcurl/opts/CURLOPT_MAXAGE_CONN.3 b/docs/libcurl/opts/CURLOPT_MAXAGE_CONN.3
new file mode 100644
index 000000000..f91bf7a8d
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_MAXAGE_CONN.3
@@ -0,0 +1,65 @@
+.\" **************************************************************************
+.\" * _ _ ____ _
+.\" * Project ___| | | | _ \| |
+.\" * / __| | | | |_) | |
+.\" * | (__| |_| | _ <| |___
+.\" * \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 2019, 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_MAXAGE_CONN 3 "18 Apr 2019" "libcurl 7.65.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_MAXAGE_CONN \- max idle time allowed for reusing a connection
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAXAGE_CONN, long maxage);
+.SH DESCRIPTION
+Pass a long as parameter containing \fImaxage\fP - the maximum time in seconds
+that you allow an existing connection to have to be considered for reuse for
+this request.
+
+The "connection cache" that holds previously used connections. When a new
+request is to be done, it will consider any connection that matches for
+reuse. The \fICURLOPT_MAXAGE_CONN(3)\fP limit prevents libcurl from trying
+very old connections for reuse, since old connections have a high risk of not
+working and thus trying them is a performance loss and sometimes service loss
+due to the difficulties to figure out the situation. If a connection is found
+in the cache that is older than this set \fImaxage\fP, it will instead be
+closed.
+.SH DEFAULT
+Default maxage is 118 seconds.
+.SH PROTOCOLS
+All
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+ curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
+
+ /* only allow 30 seconds idle time */
+ curl_easy_setopt(curl, CURLOPT_MAXAGE_CONN, 30L);
+
+ curl_easy_perform(curl);
+}
+.fi
+.SH AVAILABILITY
+Added in libcurl 7.65.0
+.SH RETURN VALUE
+Returns CURLE_OK.
+.SH "SEE ALSO"
+.BR CURLOPT_TIMEOUT "(3), " CURLOPT_FORBID_REUSE "(3), "
+.BR CURLOPT_FRESH_CONNECT "(3), "
diff --git a/docs/libcurl/opts/Makefile.inc b/docs/libcurl/opts/Makefile.inc
index 07547503b..c8e15a5ed 100644
--- a/docs/libcurl/opts/Makefile.inc
+++ b/docs/libcurl/opts/Makefile.inc
@@ -189,6 +189,7 @@ man_MANS = \
CURLOPT_MAIL_AUTH.3 \
CURLOPT_MAIL_FROM.3 \
CURLOPT_MAIL_RCPT.3 \
+ CURLOPT_MAXAGE_CONN.3 \
CURLOPT_MAXCONNECTS.3 \
CURLOPT_MAXFILESIZE.3 \
CURLOPT_MAXFILESIZE_LARGE.3 \
diff --git a/docs/libcurl/symbols-in-versions b/docs/libcurl/symbols-in-versions
index 0f43aee31..36c510139 100644
--- a/docs/libcurl/symbols-in-versions
+++ b/docs/libcurl/symbols-in-versions
@@ -463,6 +463,7 @@ CURLOPT_LOW_SPEED_TIME 7.1
CURLOPT_MAIL_AUTH 7.25.0
CURLOPT_MAIL_FROM 7.20.0
CURLOPT_MAIL_RCPT 7.20.0
+CURLOPT_MAXAGE_CONN 7.65.0
CURLOPT_MAXCONNECTS 7.7
CURLOPT_MAXFILESIZE 7.10.8
CURLOPT_MAXFILESIZE_LARGE 7.11.0