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CURLPIPE_HTTP1 is deprecated

Description

CURLPIPE_HTTP1 is a flag that used to enable HTTP/1.1 pipelining when passed to curl_multi_setopt() with the CURLMOPT_PIPELINING option. Support for HTTP/1.1 pipelining was removed from libcurl itself in version 7.62.0, because it proved fragile and was superseded by HTTP/2 multiplexing.

When PHP is linked against a libcurl older than 7.62.0, setting this flag still works but now raises an E_DEPRECATED notice. When linked against libcurl 7.62.0 or later (the common case on current systems), the same code instead raises an E_WARNING stating that CURLPIPE_HTTP1 is no longer supported, and the flag has no effect either way.

Example

<?php

$mh = curl_multi_init();
curl_multi_setopt($mh, CURLMOPT_PIPELINING, CURLPIPE_HTTP1);

?>

Alternatives

  • Remove CURLPIPE_HTTP1 from the value passed to curl_multi_setopt($mh, CURLMOPT_PIPELINING, ...).
  • Use CURLPIPE_MULTIPLEX to enable HTTP/2 multiplexing instead.

Changed Behavior

This error may appear following an evolution in behavior, in previous versions. See curl_multi_setopt