multi:SetOpt_Max_Pipeline_Length(max)
When this limit is reached, libcurl will use another connection to the same
host (see #CURLMOPT_MAX_HOST_CONNECTIONS
), 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
*
#CURLMOPT_MAX_PIPELINE_LENGTH
.