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CURLOPT_HTTP09 - allow HTTP/0.9 response #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP09_ALLOWED, long allowed); Pass the long argument allowed set to 1L to allow HTTP/0.9 responses. A 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! 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. HTTP

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);
}

Option added in 7.64.0, present along with HTTP. Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not. CURLOPT_SSLVERSION "(3), " CURLOPT_HTTP_VERSION "(3), "