Man page - curlopt_maxlifetime_conn(3)

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Manual

CURLOPT_MAXLIFETIME_CONN

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO

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

This functionality affects all supported 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

Added in curl 7.80.0

RETURN VALUE

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3) .