NAME

       CURLOPT_DEFAULT_PROTOCOL - default protocol to use if the URL is missing a scheme name

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEFAULT_PROTOCOL,
                                 char *protocol);

DESCRIPTION

       This option tells libcurl to use protocol if the URL is missing a scheme name.

       Use one of these protocol (scheme) names:

       dict,  file, ftp, ftps, gopher, http, https, imap, imaps, ldap, ldaps, pop3, pop3s, rtsp, scp, sftp, smb,
       smbs, smtp, smtps, telnet, tftp

       An unknown or unsupported protocol causes error CURLE_UNSUPPORTED_PROTOCOL  when  libcurl  parses  a  URL
       without  a  scheme.  Parsing  happens  when  curl_easy_perform(3) or curl_multi_perform(3) is called. The
       protocol set supported by libcurl vary depending on how it was built.  Use  curl_version_info(3)  if  you
       need a list of protocol names supported by the build of libcurl that you are using.

       This option does not change the default proxy protocol (http).

       Without this option libcurl would make a guess based on the host, see CURLOPT_URL(3) for details.

       The application does not have to keep the string around after setting this option.

       Using  this option multiple times makes the last set string override the previous ones. Set it to NULL to
       disable its use again.

DEFAULT

       NULL (make a guess based on the host)

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           /* set a URL without a scheme */
           curl_easy_setopt(curl, CURLOPT_URL, "example.com");

           /* set the default protocol (scheme) for schemeless URLs */
           curl_easy_setopt(curl, CURLOPT_DEFAULT_PROTOCOL, "https");

           /* Perform the request */
           curl_easy_perform(curl);
         }
       }

AVAILABILITY

       Added in curl 7.45.0

RETURN VALUE

       CURLE_OK if the option is supported.

       CURLE_OUT_OF_MEMORY if there was insufficient heap space.

       CURLE_UNKNOWN_OPTION if the option is not supported.

SEE ALSO

       CURLINFO_PROTOCOL(3), CURLINFO_SCHEME(3), CURLOPT_URL(3)

libcurl                                            2025-03-05                        CURLOPT_DEFAULT_PROTOCOL(3)