.\" generated by cd2nroff 0.1 from CURLOPT_HTTP09_ALLOWED.md
.TH CURLOPT_HTTP09_ALLOWED 3 "2026-06-24" libcurl
.SH NAME
CURLOPT_HTTP09_ALLOWED \- allow HTTP/0.9 response
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP09_ALLOWED, long allowed);
.fi
.SH DESCRIPTION
Pass the long argument \fIallowed\fP 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.
.SH DEFAULT
0
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
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);
  }
}
.fi
.SH 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
responses.
.SH AVAILABILITY
Added in curl 7.64.0
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_HTTP_VERSION (3),
.BR CURLOPT_SSLVERSION (3)