1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_HTTP09_ALLOWED 5Section: 3 6Source: libcurl 7Protocol: 8 - HTTP 9See-also: 10 - CURLOPT_HTTP_VERSION (3) 11 - CURLOPT_SSLVERSION (3) 12--- 13 14# NAME 15 16CURLOPT_HTTP09_ALLOWED - allow HTTP/0.9 response 17 18# SYNOPSIS 19 20~~~c 21#include <curl/curl.h> 22 23CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP09_ALLOWED, long allowed); 24~~~ 25 26# DESCRIPTION 27 28Pass the long argument *allowed* set to 1L to allow HTTP/0.9 responses. 29 30An HTTP/0.9 response is a server response entirely without headers and only a 31body. You can connect to lots of random TCP services and still get a response 32that curl might consider to be HTTP/0.9! 33 34# DEFAULT 35 36curl allowed HTTP/0.9 responses by default before 7.66.0 37 38Since 7.66.0, libcurl requires this option set to 1L to allow HTTP/0.9 39responses. 40 41# EXAMPLE 42 43~~~c 44int main(void) 45{ 46 CURL *curl = curl_easy_init(); 47 if(curl) { 48 CURLcode ret; 49 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); 50 curl_easy_setopt(curl, CURLOPT_HTTP09_ALLOWED, 1L); 51 ret = curl_easy_perform(curl); 52 } 53} 54~~~ 55 56# AVAILABILITY 57 58Option added in 7.64.0, present along with HTTP. 59 60# RETURN VALUE 61 62Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not. 63