[Bug 54883] FTP task should support proxies

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=54883

--- Comment #1 from Arno Unkrig <ar...@unkrig.de> ---
I found out that FTPHTTPClient implements only ONE variety of FTP proxy support
("FTP over HTTP"), while there seem to exist at least SIX ways to do it, see

http://www.codeproject.com/Articles/9547/How-Proxy-Server-serves-FTP-clients

The proxy that I use supports at least these:

(1) USER u1, PASS p1, SITE x, USER u2,   PASS p2
(2) USER u1, PASS p1, OPEN x, USER u2,   PASS p2
(3) USER u1, PASS p1,         USER u2@x, PASS p2

, where "x" is the target FTP server, "u1/p1" are the credentials for the FTP
proxy, and "u2/p2" are the credentials for the target FTP server.

I will dig deeper into this to develop a plan as to how FTP proxying should be
implemented.

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