CURLOPT_EXPECT_100_TIMEOUT_MS(3) Library Functions Manual CURLOPT_EXPECT_100_TIMEOUT_MS(3)

CURLOPT_EXPECT_100_TIMEOUT_MS - timeout for Expect: 100-continue response

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_EXPECT_100_TIMEOUT_MS,
                          long milliseconds);

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.

1000 milliseconds

HTTP

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);
  }
}

Added in 7.36.0

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

CURLOPT_HTTPPOST(3), CURLOPT_POST(3)

2024-05-22 libcurl