Function http_get_accept_language_header

http.c:2201–2211

* Get an Accept-Language header which indicates user's preferred languages. * * Examples: * LANGUAGE= -> "" * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1" * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1" * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1" * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1

 *   LANGUAGE= LANG=C -> ""
 */
const char *http_get_accept_language_header(void)
{
	if (!cached_accept_language) {
		struct strbuf buf = STRBUF_INIT;
		write_accept_language(&buf);
		if (buf.len > 0)
			cached_accept_language = strbuf_detach(&buf, NULL);
	}

	return cached_accept_language;
}

static void http_opt_request_remainder(CURL *curl, off_t pos)
{