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  is  used  as  the  maximum  amount of
       simultaneously open connections to a single host (a host being the same as  a  hostname  +
       port  number pair). For each new session to a host, libcurl might open a new connection up
       to the limit set by CURLMOPT_MAX_HOST_CONNECTIONS(3).  When  the  limit  is  reached,  new
       sessions are kept pending until a connection becomes available.

       The  default max value is 0, unlimited. 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 performed  due  to  the
       set  limit,  they  are  queued  up  waiting  for  their  chance.  When  that  happens, the
       CURLOPT_TIMEOUT_MS(3) timeout is 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) timeout is however
       treated as a per-connect timeout.

       Changing this value when there are transfers in progress is possible, and the new value is
       then  used  the  next time checks are performed. Lowering the value does however not close
       down any active transfers, it simply does not allow new ones to get made.

DEFAULT

       0

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         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 curl 7.30.0

RETURN VALUE

       Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.

SEE ALSO

       CURLMOPT_MAXCONNECTS(3), CURLMOPT_MAX_TOTAL_CONNECTIONS(3)