CURLOPT_HTTP09_ALLOWED(3)  Library Functions Manual  CURLOPT_HTTP09_ALLOWED(3)

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
       Option added in 7.64.0, present along with HTTP.

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

SEE ALSO
       CURLOPT_HTTP_VERSION(3), CURLOPT_SSLVERSION(3)

libcurl                          April 02 2024       CURLOPT_HTTP09_ALLOWED(3)