CURLOPT_HTTP09_ALLOWED(3)

CURLOPT_HTTP09_ALLOWED3

Allow http/0.9 response

Usage

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP09_ALLOWED, long allowed);

Overview

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

Examples

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);
  }
}

Return value

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

Releases

32 releases since macOS 12.0.1; the text changed 9 times.

  1. 12.0.1–12.2
  2. 12.3–12.5
  3. 13.0
  4. 13.1
  5. 13.2
  6. 13.3
  7. 13.4
  8. 13.5–14.1
  9. 14.2–14.4
  10. 14.5–26.5

Availability

Option added in 7.64.0, present along with HTTP.

From curl 166.0.0.0.1 in macOS 26.5. Parsed by carta from the page's man source.