May be standard îr most used method ?

I found 3 modules like FormXML but it seems they do not work with multipart/form-data forms (with files)

And also they work different ways.

Thanx.

Not something I've done, but I've had a look round in response to your question.  I suppose I should start by asking why you want to save an http request as XML - if it's for interchange with some other system, then the format to go for would be that used by the other system.  There seems to be something of a Microsoft standard around - I've been reading

http://developer.apple.com/internet/webcontent/xmlhttpreq.html
http://jibbering.com/2002/4/httprequest.html
http://www.devguru.com/Technologies/xmldom/quickref/obj_httpRequest.html

None of the above mentions Perl, but it's probably a sensible standard to look for / go with if you can even if you have to write your own XML generator

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