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CURLOPT_HTTP09_ALLOWED(3)           libcurl          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

       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_SSLVERSION(3), CURLOPT_HTTP_VERSION(3),

ibcurl 8.1.2                    April 26, 2023       CURLOPT_HTTP09_ALLOWED(3)

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