CURLOPT_REDIR_PROTOCOLS(3)                            Library Functions Manual

NAME
       CURLOPT_REDIR_PROTOCOLS - protocols allowed to redirect to

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REDIR_PROTOCOLS, long bitmask);

DESCRIPTION
       This option is deprecated. We strongly recommend using
       CURLOPT_REDIR_PROTOCOLS_STR(3) instead because this option cannot
       control all available protocols.

       Pass a long that holds a bitmask of protocol bits. If used, this
       bitmask limits what protocols libcurl may use in a transfer that it
       follows to in a redirect when CURLOPT_FOLLOWLOCATION(3) is enabled.
       This allows you to limit specific transfers to only be allowed to use a
       subset of protocols in redirections.

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

       By default libcurl allows HTTP, HTTPS, FTP and FTPS on redirect
       (7.65.2).  CURLPROTO_ALL enables all protocols on redirect, including
       those otherwise disabled for security.

       These are the available protocol defines:
       CURLPROTO_DICT
       CURLPROTO_FILE
       CURLPROTO_FTP
       CURLPROTO_FTPS
       CURLPROTO_GOPHER
       CURLPROTO_HTTP
       CURLPROTO_HTTPS
       CURLPROTO_IMAP
       CURLPROTO_IMAPS
       CURLPROTO_LDAP
       CURLPROTO_LDAPS
       CURLPROTO_MQTT
       CURLPROTO_POP3
       CURLPROTO_POP3S
       CURLPROTO_RTMP
       CURLPROTO_RTMPE
       CURLPROTO_RTMPS
       CURLPROTO_RTMPT
       CURLPROTO_RTMPTE
       CURLPROTO_RTMPTS
       CURLPROTO_RTSP
       CURLPROTO_SCP
       CURLPROTO_SFTP
       CURLPROTO_SMB
       CURLPROTO_SMBS
       CURLPROTO_SMTP
       CURLPROTO_SMTPS
       CURLPROTO_TELNET
       CURLPROTO_TFTP

DEFAULT
       HTTP, HTTPS, FTP and FTPS

PROTOCOLS
       This functionality affects http only

EXAMPLE
       int main(int argc, char *argv[])
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode result;
           /* 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,
                            CURLPROTO_HTTP | CURLPROTO_HTTPS);

           /* Perform the request */
           result = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

HISTORY
       CURLPROTO_* macros became long types in 8.16.0, prior to this version a
       long cast was necessary when passed to curl_easy_setopt(3).

DEPRECATED
       Deprecated since 7.85.0.

AVAILABILITY
       Added in curl 7.19.4

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLINFO_SCHEME(3), CURLOPT_DEFAULT_PROTOCOL(3), CURLOPT_PROTOCOLS(3),
       CURLOPT_REDIR_PROTOCOLS_STR(3)

libcurl                           2026-09-02        CURLOPT_REDIR_PROTOCOLS(3)