CURLOPT_CO...TTIMEOUT_MS(3) Library Functions ManualCURLOPT_CO...TTIMEOUT_MS(3)
NAME
CURLOPT_CONNECTTIMEOUT_MS - timeout for the connect phase
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONNECTTIMEOUT_MS,
long timeout);
DESCRIPTION
Pass a long. It sets the maximum time in milliseconds that you allow the
connection phase to take. This timeout only limits the connection phase,
it has no impact once libcurl has connected. The connection phase in-
cludes the name resolve (DNS) and all protocol handshakes and negotia-
tions until there is an established connection with the remote side.
Set this option to zero to switch to the default built-in connection
timeout - 300 seconds. See also the CURLOPT_TIMEOUT_MS(3) option.
CURLOPT_CONNECTTIMEOUT(3) is the same function but set in seconds.
If both CURLOPT_CONNECTTIMEOUT(3) and CURLOPT_CONNECTTIMEOUT_MS(3) are
set, the value set last is used.
The connection timeout is included in the general all-covering CUR-
LOPT_TIMEOUT_MS(3):
With CURLOPT_CONNECTTIMEOUT_MS(3) set to 3000 and CURLOPT_TIMEOUT_MS(3)
set to 5000, the operation can never last longer than 5000 milliseconds,
and the connection phase cannot last longer than 3000 milliseconds.
With CURLOPT_CONNECTTIMEOUT_MS(3) set to 4000 and CURLOPT_TIMEOUT_MS(3)
set to 2000, the operation can never last longer than 2000 milliseconds.
Including the connection phase.
This option may cause libcurl to use the SIGALRM signal to timeout sys-
tem calls on builds not using asynch DNS. In Unix-like systems, this
might cause signals to be used unless CURLOPT_NOSIGNAL(3) is set.
DEFAULT
300000
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* complete connection within 10000 milliseconds */
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT_MS, 10000L);
curl_easy_perform(curl);
}
}
AVAILABILITY
Added in curl 7.16.2
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_LOW_SPEED_LIMIT(3), CURLOPT_MAX_RECV_SPEED_LARGE(3), CUR-
LOPT_TIMEOUT_MS(3)
libcurl 2026-07-12 CURLOPT_CO...TTIMEOUT_MS(3)
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