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deps/curl/docs/libcurl/opts/CURLMOPT_MAX_HOST_CONNECTIONS.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLMOPT_MAX_HOST_CONNECTIONS
+Section: 3
+Source: libcurl
+See-also:
+  - CURLMOPT_MAXCONNECTS (3)
+  - CURLMOPT_MAX_TOTAL_CONNECTIONS (3)
+---
+
+# NAME
+
+CURLMOPT_MAX_HOST_CONNECTIONS - max number of connections to a single host
+
+# SYNOPSIS
+
+~~~c
+#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.
+
+# DEFAULT
+
+0
+
+# PROTOCOLS
+
+HTTP(S)
+
+# EXAMPLE
+
+~~~c
+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 7.30.0
+
+# RETURN VALUE
+
+Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.