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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_EXPECT_100_TIMEOUT_MS
Section: 3
Source: libcurl
See-also:
- CURLOPT_HTTPPOST (3)
- CURLOPT_POST (3)
Protocol:
- HTTP
Added-in: 7.36.0
---
# NAME
CURLOPT_EXPECT_100_TIMEOUT_MS - timeout for Expect: 100-continue response
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_EXPECT_100_TIMEOUT_MS,
long milliseconds);
~~~
# DESCRIPTION
Pass a long to tell libcurl the number of *milliseconds* to wait for a
server response with the HTTP status 100 (Continue), 417 (Expectation Failed)
or similar after sending an HTTP request containing an Expect: 100-continue
header. If this times out before a response is received, the request body is
sent anyway.
# DEFAULT
1000 milliseconds
# %PROTOCOLS%
# EXAMPLE
~~~c
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* wait 3 seconds for 100-continue */
curl_easy_setopt(curl, CURLOPT_EXPECT_100_TIMEOUT_MS, 3000L);
curl_easy_perform(curl);
}
}
~~~
# %AVAILABILITY%
# 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).
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