.\" generated by cd2nroff 0.1 from CURLOPT_REDIR_PROTOCOLS.md
.TH CURLOPT_REDIR_PROTOCOLS 3 "2026-09-10" libcurl
.SH NAME
CURLOPT_REDIR_PROTOCOLS \- protocols allowed to redirect to
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REDIR_PROTOCOLS, long bitmask);
.fi
.SH DESCRIPTION
This option is deprecated. We strongly recommend using
\fICURLOPT_REDIR_PROTOCOLS_STR(3)\fP 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 \fICURLOPT_FOLLOWLOCATION(3)\fP is enabled. This allows you to limit
specific transfers to only be allowed to use a subset of protocols in
redirections.

Protocols denied by \fICURLOPT_PROTOCOLS(3)\fP are not overridden by this
option.

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

These are the available protocol defines:
.nf
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
.fi
.SH DEFAULT
HTTP, HTTPS, FTP and FTPS
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
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);
  }
}
.fi
.SH HISTORY
\fBCURLPROTO_\fP* macros became \fIlong\fP types in 8.16.0, prior to this version
a \fIlong\fP cast was necessary when passed to \fIcurl_easy_setopt(3)\fP.
.SH DEPRECATED
Deprecated since 7.85.0.
.SH AVAILABILITY
Added in curl 7.19.4
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLINFO_SCHEME (3),
.BR CURLOPT_DEFAULT_PROTOCOL (3),
.BR CURLOPT_PROTOCOLS (3),
.BR CURLOPT_REDIR_PROTOCOLS_STR (3)