I make some requests to a site and i want to see, what kind of variables has been sent to the server..
May be its possible with fiddler
but i can\'t fig
You can do this in Fiddler using the following steps.
Locate the request in fiddler that relates to the post - you should be able to see the URL you expect in the URL column.
Select that line and the detailed view will open. There is a WebForms tab (inside "Inspectors") that displays the POST data in a neat table. You can also see it in the Raw tab, but it isn't nicely formatted like the WebForms tab.
I have made a screenshot to help you: