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,  POP3,
       POP3S, RTMP, RTMPE, RTMPS, RTMPT, RTMPTE, RTMPTS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS,
       TELNET, TFTP

       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

       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_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_REDIR_PROTOCOLS_STR(3), CURLOPT_URL(3), curl_version_info(3), CURLINFO_SCHEME(3),