You need to do a POST instead of a GET. In the input fields, for example you have name=blah1 and name=blah2
You do a: POST /file.php?blah1=informationtosend&blah2=samething HTTP/1.1
Well, it depends on the context, sometimes it works like that. For example, with the cookies, it won't work like that, you'll have to add lines after the Host: ...
I didn't try the POST method a lot, only when I needed to, so try it, you'll see by yourself =]
I hope it will work. good luck.