curl / libcurl / API / curl_easy_setopt / CURLOPT_HTTP09_ALLOWED

CURLOPT_HTTP09_ALLOWED explained

Name

CURLOPT_HTTP09_ALLOWED - allow HTTP/0.9 response

Synopsis

#include <curl/curl.h>
 
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP09_ALLOWED, long allowed);

Description

Pass the long argument allowed set to 1L to allow HTTP/0.9 responses.

An HTTP/0.9 response is a server response entirely without headers and only a body. You can connect to lots of random TCP services and still get a response that curl might consider to be HTTP/0.9!

Default

curl allowed HTTP/0.9 responses by default before 7.66.0

Since 7.66.0, libcurl requires this option set to 1L to allow HTTP/0.9 responses.

Protocols

HTTP

Example

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode ret;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    curl_easy_setopt(curl, CURLOPT_HTTP09_ALLOWED, 1L);
    ret = curl_easy_perform(curl);
  }
}

Availability

Added in curl 7.64.0

Return value

Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.

See also

CURLOPT_HTTP_VERSION(3), CURLOPT_SSLVERSION(3)

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