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        !            23: .TH CURLOPT_HTTP09_ALLOWED 3 "August 05, 2019" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_HTTP09 \- allow HTTP/0.9 response
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP09_ALLOWED, long allowed);
        !            31: .SH DESCRIPTION
        !            32: Pass the long argument \fIallowed\fP set to 1L to allow HTTP/0.9 responses.
        !            33: 
        !            34: A HTTP/0.9 response is a server response entirely without headers and only a
        !            35: body. You can connect to lots of random TCP services and still get a response
        !            36: that curl might consider to be HTTP/0.9!
        !            37: .SH DEFAULT
        !            38: curl allowed HTTP/0.9 responses by default before 7.66.0
        !            39: 
        !            40: Since 7.66.0, libcurl requires this option set to 1L to allow HTTP/0.9
        !            41: responses.
        !            42: .SH PROTOCOLS
        !            43: HTTP
        !            44: .SH EXAMPLE
        !            45: .nf
        !            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: .fi
        !            54: .SH AVAILABILITY
        !            55: Option added in 7.64.0, present along with HTTP.
        !            56: .SH RETURN VALUE
        !            57: Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
        !            58: .SH "SEE ALSO"
        !            59: .BR CURLOPT_SSLVERSION "(3), " CURLOPT_HTTP_VERSION "(3), "