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* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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CURLOPT_TELNETOPTIONS - custom telnet options #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TELNETOPTIONS, struct curl_slist *cmds); Provide a pointer to a curl_slist with variables to pass to the telnet negotiations. The variables should be in the format <option=value>. libcurl supports the options 'TTYPE', 'XDISPLOC' and 'NEW_ENV'. See the TELNET standard for details. NULL TELNET

CURL *curl = curl_easy_init();
if(curl) {
 struct curl_slist *options;
 options = curl_slist_append(NULL, "TTTYPE=vt100");
 options = curl_slist_append(options, "USER=foobar");
 curl_easy_setopt(curl, CURLOPT_URL, "telnet://example.com/");
 curl_easy_setopt(curl, CURLOPT_TELNETOPTIONS, options);
 ret = curl_easy_perform(curl);
 curl_easy_cleanup(curl);
 curl_slist_free_all(options);
}

Along with TELNET Returns CURLE_OK if TELNET is supported, and CURLE_UNKNOWN_OPTION if not. CURLOPT_HTTPHEADER "(3), " CURLOPT_QUOTE "(3), "