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* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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CURLOPT_SERVICE_NAME - authentication service name #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SERVICE_NAME, char *name); Pass a char * as parameter to a string holding the name of the service for DIGEST-MD5, SPNEGO and Kerberos 5 authentication mechanisms. The default service names are "ftp", "HTTP", "imap", "pop" and "smtp". This option allows you to change them. The application does not have to keep the string around after setting this option. See above HTTP, FTP, IMAP, POP and SMTP

CURL *curl = curl_easy_init();
if(curl) {
 CURLcode ret;
 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
 curl_easy_setopt(curl, CURLOPT_SERVICE_NAME, "custom");
 ret = curl_easy_perform(curl);
}

Added in 7.43.0 for HTTP, 7.49.0 for FTP, IMAP, POP3 and SMTP. Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. CURLOPT_PROXY "(3), " CURLOPT_PROXYTYPE "(3), "