Hi,
Well what you want is achieved by two this ... 404 error page and with mod_rewrite
So mod_rewrite is not out of scope..
Let me explain you mod_rewrite here ..
If you request a page say
http://www.example.com/abc.html
than what your Web server(apache) does with mod rewrite it will read the url, if it is in form
/[a-zA-Z-].html than it will execute /index.html though the Browser never comes to know that a different page is executed.
If you don't believe me try some Price comparison sites they mostly use mod_Rewrite. and in technical term its URL rewriting..
and for post data well you have to be careful and I am not sure if you can achieve it with 404 page also 404 will not keep this
Quote:
The most important thing is the URL must stay the same
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it willbe achieve by mod_Rewrite module of apache..