CURLOPT_REDIR_PROTOCOLS - protocols allowed to redirect to

Added in curl 7.19.4

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.

Deprecated since 7.85.0.

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_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

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 redirects to HTTP and HTTPS URLs */ curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, (long) CURLPROTO_HTTP | CURLPROTO_HTTPS); /* Perform the request */ curl_easy_perform(curl); } }

CURLOPT_REDIR_PROTOCOLS - protocols allowed to redirect to

This functionality affects http only

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).

CURLINFO_SCHEME(3), CURLOPT_DEFAULT_PROTOCOL(3), CURLOPT_PROTOCOLS(3), CURLOPT_REDIR_PROTOCOLS_STR(3) libcurl 2025-06-16 CURLOPT_REDIR_PROTOCOLS(3)

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REDIR_PROTOCOLS, long bitmask);