Redirections and port / http-https change

From: Jicea via curl-library <curl-library_at_lists.haxx.se>
Date: Fri, 3 Oct 2025 18:28:33 +0000

Hi all,

I would like to have precision on redirections, I've tried to get it from the docs without success.

In https://curl.se/libcurl/c/CURLOPT_FOLLOWLOCATION.html:

> By default, libcurl only sends Authentication: or explicitly set Cookie: headers to the initial host given
> in the original URL, to avoid leaking username + password to other sites. CURLOPT_UNRESTRICTED_AUTH is provided to change that behavior.

My questions are about port and HTTPS/HTTP

- are the Authentication/Cookie headers filtered when ports change (even with the same hostname) ?
- are the Authentication/Cookie headers filtered when going from https:// to http:// ?

Contrary to the doc, in the code port / protocol seem to be taken into account (unless "host" in the doc stands for protocol + host + port ?)

/*
 * Curl_auth_ollowed_to_host() tells if authentication, cookies or other
 * "sensitive data" can (still) be sent to this host.
 */
bool Curl_auth_allowed_to_host(struct Curl_easy *data)
{
  struct connectdata *conn = data->conn;
  return !data->state.this_is_a_follow ||
         data->set.allow_auth_to_other_hosts ||
         (data->state.first_host &&
          curl_strequal(data->state.first_host, conn->host.name) &&
          (data->state.first_remote_port == conn->remote_port) &&
          (data->state.first_remote_protocol == conn->handler->protocol));
}

Thanks!


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Received on 2025-10-03