GNURLOPT_REDIR_PROTOCOLS(3)

📦 version 7.72.0, in nixos 26.05, nixpkgs unstable

💅 GNURLOPT_REDIR_PROTOCOLS(3) — redirect protocols, but make it a vibe check ✨

Okay bestie, this is the GNURLOPT_REDIR_PROTOCOLS(3) page from the curl_easy_setopt options manual. We're talking CURLOPT_REDIR_PROTOCOLS, and it's giving “you can follow that redirect, but only if your protocol is invited to the group chat.” 🎀

🌸 NAME 🌸

CURLOPT_REDIR_PROTOCOLS — set protocols allowed to redirect to

✨ SYNOPSIS ✨

#include <gnurl/curl.h>

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

🦋 DESCRIPTION 🦋

Okay so you pass a long that holds a bitmask of CURLPROTO_* defines. If you use it, 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 lets you limit specific transfers to only be allowed to use a subset of protocols in redirections. Lowkey powerful, highkey useful. 💖

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

By default libcurl will allow HTTP, HTTPS, FTP and FTPS on redirect (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. CURLPROTO_ALL enables all protocols on redirect, including those 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

🎀 DEFAULT 🎀

HTTP, HTTPS, FTP and FTPS (Since 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,
                          CURLPROTO_HTTP | CURLPROTO_HTTPS);

         /* Perform the request */
         curl_easy_perform(curl);
       }

👑 AVAILABILITY 👑

Added in 7.19.4, before then it would follow all protocols.

💜 RETURN VALUE 💜

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

🫶 SEE ALSO 🫶

Mwah 💋 that's the whole page. It's from libcurl 7.37.0, dated 19 Jun 2014, and yes bestie, it's the GNURLOPT_REDIR_PROTOCOLS(3) page. Go protect your redirects fr fr 🦋✨

📦 where this page comes from