Dunno about the raw Java handler, but it appears that a custom CF 404
handler does have full access to URL, FORM, CGI, etc.
I threw together a CF template with this body and called it dsp.404.cfm:
<h1>I am a 404 handler</h1>
<form action="nofile.cfm" method="post">
<input type="Text" name="varString" value="string variable" />
<br />
<input type="Submit" value="post" />
</form>
<br />
<cfdump var="#form#" label="FORM" />
<cfdump var="#url#" label="URL" />
<cfdump var="#cgi#" label="CGI" />
Then in IIS, I set the custom Error for 404 to Message Type: URL, URL:
/dsp.404.cfm and then when you post that little form, the form vars show in
the first dump on the custom 404 page.
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