CURLMOPT_MAX_PIPELINE_LENGTH man page
CURLMOPT_MAX_PIPELINE_LENGTH — maximum number of requests in a pipeline
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_PIPELINE_LENGTH, long max);
No function since pipelining was removed in 7.62.0.
Pass a long. The set max number will be used as the maximum amount of outstanding requests in an HTTP/1.1 pipelined connection. This option is only used for HTTP/1.1 pipelining, not for HTTP/2 multiplexing.
When this limit is reached, libcurl will use another connection to the same host (see CURLMOPT_MAX_HOST_CONNECTIONS(3)), or queue the request until one of the pipelines to the host is ready to accept a request. Thus, the total number of requests in-flight is CURLMOPT_MAX_HOST_CONNECTIONS(3) * CURLMOPT_MAX_PIPELINE_LENGTH(3).
CURLM *m = curl_multi_init(); /* set a more conservative pipe length */ curl_multi_setopt(m, CURLMOPT_MAX_PIPELINE_LENGTH, 3L);
Added in 7.30.0
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE(3), CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE(3), CURLMOPT_PIPELINING(3), curl_multi_setopt(3).