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CURLOPT_PIPEWAIT

Section: curl_easy_setopt options (3)
Updated: May 01, 2016
Index Return to Main Contents

 

NAME

CURLOPT_PIPEWAIT - wait for pipelining/multiplexing  

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PIPEWAIT, long wait);  

DESCRIPTION

Set wait to 1L to tell libcurl to prefer to wait for a connection to confirm or deny that it can do pipelining or multiplexing before continuing.

When about to perform a new transfer that allows pipelining or multiplexing, libcurl will check for existing connections to re-use and pipeline on. If no such connection exists it will immediately continue and create a fresh new connection to use.

By setting this option to 1 - and having CURLMOPT_PIPELINING(3) enabled for the multi handle this transfer is associated with - libcurl will instead wait for the connection to reveal if it is possible to pipeline/multiplex on before it continues. This enables libcurl to much better keep the number of connections to a minimum when using pipelining or multiplexing protocols.

The effect thus becomes that with this option set, libcurl prefers to wait and re-use an existing connection for pipelining rather than the opposite: prefer to open a new connection rather than waiting.

The waiting time is as long as it takes for the connection to get up and for libcurl to get the necessary response back that informs it about its protocol and support level.  

DEFAULT

0 (off)  

PROTOCOLS

HTTP(S)  

EXAMPLE

 

AVAILABILITY

Added in 7.43.0  

RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.  

SEE ALSO

CURLOPT_FORBID_REUSE(3), CURLOPT_FRESH_CONNECT(3), CURLMOPT_PIPELINING(3), CURLMOPT_MAX_HOST_CONNECTIONS(3),


 

Index

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO





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