CURLMOPT_MAX_HOST_CONNECTIONS - max number of connections to a single host
#include <curl/curl.h> CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_HOST_CONNECTIONS, long max);
curl_multi_setopt options CURLMOPT_MAX_HOST_CONNECTIONS(3) NAME CURLMOPT_MAX_HOST_CONNECTIONS - max number of connections to a single host SYNOPSIS #include <curl/curl.h> CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_HOST_CONNECTIONS, long max); DESCRIPTION Pass a long to indicate max. The set number will be used as the maximum amount of simultaneously open connections to a single host (a host being the same as a host name + port number pair). For each new session to a host, libcurl will open a new connection up to the limit set by CURLMOPT_MAX_HOST_CONNECTIONS(3). When the limit is reached, the ses- sions will be pending until a connection becomes available. If CURL- MOPT_PIPELINING(3) is enabled, libcurl will try to pipeline if the host is capable of it. The default max value is 0, unlimited. However, for backwards compati- bility, setting it to 0 when CURLMOPT_PIPELINING(3) is 1 will not be treated as unlimited. Instead it will open only 1 connection and try to pipeline on it. This set limit is also used for proxy connections, and then the proxy is considered to be the host for which this limit counts. When more transfers are added to the multi handle than what can be per- formed due to the set limit, they will be queued up waiting for their chance. When that happens, the CURLOPT_TIMEOUT_MS(3) timeout will be counted inclusive of the waiting time, meaning that if you set a too narrow timeout in such a case the transfer might never even start before it times out. Even in the queued up situation, the CURLOPT_CONNECTTIMEOUT_MS(3) time- out is however treated as a per-connect timeout. DEFAULT 0 PROTOCOLS HTTP(S) EXAMPLE CURLM *m = curl_multi_init(); /* do no more than 2 connections per host */ curl_multi_setopt(m, CURLMOPT_MAX_HOST_CONNECTIONS, 2L); AVAILABILITY Added in 7.30.0 RETURN VALUE Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLMOPT_MAXCONNECTS(3), CURLMOPT_MAX_TOTAL_CONNECTIONS(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 November 26, 2021 CURLMOPT_MAX_HOST_CONNECTIONS(3)