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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 re- sponse that curl might consider to be HTTP/0.9. DEFAULT 0 PROTOCOLS This functionality affects http only EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_HTTP09_ALLOWED, 1L); result = curl_easy_perform(curl); } } HISTORY 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 re- sponses. AVAILABILITY Added in curl 7.64.0 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). SEE ALSO CURLOPT_HTTP_VERSION(3), CURLOPT_SSLVERSION(3) libcurl 2026-06-11 CURLOPT_HTTP09_ALLOWED(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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