LIST and RETR still appear to work as intended on ftp:// URLs after my changes. I wasn't able to test STOR because the browser doesn't appear to support FTP uploads at this time (although our FTP implementation appears perfectly capable of doing an FTP upload.)
If I understood the issue correctly, though, what we're doing is ensuring that we receive a preliminary 100 response from the FTP server for a given action before jumping to the 200 code describing what we do if the action was completed. Even though it makes no logical sense for a server to say an action was completed before it was initiated, someone could write a really annoying FTP server that takes advantage of this fact to crash the browser if they wanted.
athenian200
wolfbeast
Matt A. Tobin