CURLOPT_PROTOCOLS_STR(3)   Library Functions Manual   CURLOPT_PROTOCOLS_STR(3)

NAME
       CURLOPT_PROTOCOLS_STR - allowed protocols

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROTOCOLS_STR, char *spec);

DESCRIPTION
       Pass a pointer to a string that holds a comma-separated list of case
       insensitive protocol names (URL schemes) to allow in the transfer. This
       option allows applications to use libcurl built to support a wide range
       of protocols but still limit specific transfers to only be allowed to
       use a subset of them. By default, libcurl accepts all protocols it was
       built with support for. See also CURLOPT_REDIR_PROTOCOLS_STR(3).

       If trying to set a non-existing protocol or if no matching protocol at
       all is set, it returns error.

       These are the available protocols:

       DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP,
       LDAPS, MQTT, POP3, POP3S, RTMP, RTMPE, RTMPS, RTMPT, RTMPTE, RTMPTS,
       RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS, WSS

       You can set "ALL" as a short-cut to enable all protocols. Note that by
       setting all, you may enable protocols that were not supported the day
       you write this but are introduced in a future libcurl version.

       curl_version_info(3) can be used to get a list of all supported
       protocols in the current libcurl. CURLINFO_SCHEME(3) is the recommended
       way to figure out the protocol used in a previous transfer.

DEFAULT
       All protocols built-in

PROTOCOLS
       All

EXAMPLE
       int main(int argc, char **argv)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           /* pass in the URL from an external source */
           curl_easy_setopt(curl, CURLOPT_URL, argv[1]);

           /* only allow HTTP, TFTP and SFTP */
           curl_easy_setopt(curl, CURLOPT_PROTOCOLS_STR, "http,tftp,sftp");

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

AVAILABILITY
       Added in 7.85.0

RETURN VALUE
       Returns CURLE_UNKNOWN_OPTION if the option is not implemented,
       CURLE_UNSUPPORTED_PROTOCOL if a listed protocol is not supported or
       disabled, CURLE_BAD_FUNCTION_ARGUMENT if no protocol is listed else
       CURLE_OK.

SEE ALSO
       CURLINFO_SCHEME(3), CURLOPT_DEFAULT_PROTOCOL(3),
       CURLOPT_REDIR_PROTOCOLS_STR(3), CURLOPT_URL(3), curl_version_info(3)

libcurl                          April 26 2024        CURLOPT_PROTOCOLS_STR(3)