NAME

       CURLOPT_REDIR_PROTOCOLS_STR - protocols allowed to redirect to

SYNOPSIS

       #include <curl/curl.h>

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

DESCRIPTION

       Pass  a pointer to a string that holds a comma-separated list of case insensitive protocol
       names (URL schemes). That list limits what protocols libcurl may use in a transfer that it
       follows  to  in  a  redirect when CURLOPT_FOLLOWLOCATION(3) is enabled. This option allows
       applications to limit specific transfers to only be allowed to use a subset  of  protocols
       in redirections.

       Protocols denied by CURLOPT_PROTOCOLS_STR(3) are not overridden by this option.

       By  default  libcurl  will  allow  HTTP,  HTTPS, FTP and FTPS on redirects (since 7.65.2).
       Older versions of libcurl allowed all protocols on redirect except  several  disabled  for
       security  reasons:  Since  7.19.4 FILE and SCP are disabled, and since 7.40.0 SMB and SMBS
       are also disabled.

       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.

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

DEFAULT

       HTTP, HTTPS, FTP and FTPS (Added in 7.65.2).

       Older versions defaulted to all protocols except FILE, SCP and since 7.40.0 SMB and SMBS.

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 redirects to HTTP and HTTPS URLs */
         curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS_STR, "http,https");

         /* 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

       CURLOPT_PROTOCOLS_STR(3),