curl_multi_setopt

Parameters

multi_handle

A cURL multi handle returned by curl_multi_init().

option

One of the CURLMOPT_* constants.

value

The value to be set on option.

value should be an int for the following values of the option parameter:

Option	Set value to
CURLMOPT_PIPELINING	Pass 1 to enable or 0 to disable. Enabling pipelining on a multi handle will make it attempt to perform HTTP Pipelining as far as possible for transfers using this handle. This means that if you add a second request that can use an already existing connection, the second request will be "piped" on the same connection. As of cURL 7.43.0, the value is a bitmask, and you can also pass 2 to try to multiplex the new transfer over an existing HTTP/2 connection if possible. Passing 3 instructs cURL to ask for pipelining and multiplexing independently of each other. As of cURL 7.62.0, setting the pipelining bit has no effect. Instead of integer literals, you can also use the CURLPIPE_* constants if available.
CURLMOPT_MAXCONNECTS	Pass a number that will be used as the maximum amount of simultaneously open connections that libcurl may cache. By default the size will be enlarged to fit four times the number of handles added via curl_multi_add_handle(). When the cache is full, curl closes the oldest one in the cache to prevent the number of open connections from increasing.
CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE	Pass a number that specifies the chunk length threshold for pipelining in bytes.
CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE	Pass a number that specifies the size threshold for pipelining penalty in bytes.
CURLMOPT_MAX_CONCURRENT_STREAMS	The set number will be used as the maximum number of concurrent streams for a connections that cURL should support on connections done using HTTP/2. Valid values range from 1 to 2147483647 (2^31 - 1). The value passed here would be honored based on other system resources properties. Default is 100.
CURLMOPT_MAX_HOST_CONNECTIONS	Pass a number that specifies the maximum number of connections to a single host.
CURLMOPT_MAX_PIPELINE_LENGTH	Pass a number that specifies the maximum number of requests in a pipeline.
CURLMOPT_MAX_TOTAL_CONNECTIONS	Pass a number that specifies the maximum number of simultaneously open connections.
CURLMOPT_PUSHFUNCTION	Pass a callable that will be registered to handle server pushes and should have the following signature: pushfunction(resource $parent_ch, resource $pushed_ch, array $headers): int parent_ch The parent cURL handle (the request the client made). pushed_ch A new cURL handle for the pushed request. headers The push promise headers. The push function is supposed to return either CURL_PUSH_OK if it can handle the push, or CURL_PUSH_DENY to reject it.