FTP File Upload with HTTP Proxy

Question

Is there a way to upload a file to a FTP server when behind an HTTP proxy ?

It seems that uploading a file is not supported behind an HTTP Proxy using .Net Webclient

Answer 1

The standard way of uploading content to an ftp:// URL via an HTTP proxy would be using an HTTP PUT request. An HTTP proxy acts as an HTTP<->FTP gateway when dealing with ftp:// URLs, speaking HTTP to the requesting client and FTP to the requested FTP server.

At least the Squid HTTP Proxy supports PUT to ftp:// URLs, not sure what other proxies do.

The more common way is by abusing the CONNECT method to esablish tunnels over the proxy. But this is often not allowed due to security implications of allowing bidirectional tunnels over the proxy.