[SQU] ftp-proxy query!

Hi,
  This is a general ftp proxy question. But, I want to know how squid does
it. After the data connection is established between the client and
ftp-proxy, I want to know when proxy makes the data connection with the
web server. Is it that, the proxy reads the client request first, i.e,
"get" or "put", and after verifying the request, it makes the data
connection with web server or is it that, it establishes the data
connection with the web server, first and later closes it, depending on
the request, the client has sent.
If someone can send me the pseudocode of squid ftp proxy, or a good
documentation links, describing how squid ftp proxy woks, it will really
nice.

bye
saugata

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