curl/docs/libcurl/opts/CURLOPT_MAXLIFETIME_CONN.md

c	SPDX-License-Identifier	Title	Section	Source	See-also	Protocol	Added-in
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	CURLOPT_MAXLIFETIME_CONN	3	libcurl	CURLOPT_FORBID_REUSE (3) CURLOPT_FRESH_CONNECT (3) CURLOPT_MAXAGE_CONN (3) CURLOPT_TIMEOUT (3)	All	7.80.0

NAME

CURLOPT_MAXLIFETIME_CONN - max lifetime (since creation) allowed for reusing a connection

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAXLIFETIME_CONN,
                          long maxlifetime);

DESCRIPTION

Pass a long as parameter containing maxlifetime - the maximum time in seconds, since the creation of the connection, that you allow an existing connection to have to be considered for reuse for this request.

libcurl features a connection cache that holds previously used connections. When a new request is to be done, libcurl considers any connection that matches for reuse. The CURLOPT_MAXLIFETIME_CONN(3) limit prevents libcurl from trying too old connections for reuse. This can be used for client-side load balancing. If a connection is found in the cache that is older than this set maxlifetime, it is instead marked for closure.

If set to 0, this behavior is disabled: all connections are eligible for reuse.

DEFAULT

0 seconds (i.e., disabled)

%PROTOCOLS%

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    /* only allow each connection to be reused for 30 seconds */
    curl_easy_setopt(curl, CURLOPT_MAXLIFETIME_CONN, 30L);

    curl_easy_perform(curl);
  }
}

%AVAILABILITY%

RETURN VALUE

Returns CURLE_OK.