Enter an HTTP request, like the ones you can capture using the LiveHTTPHeaders addon for Firefox.
Note the request must be properly formated. For example:
GET / HTTP/1.1 Host: tap.rubyforge.org User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) Gecko/20080201 Firefox/2.0.0.12 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive
Proper formatting for POST requires an empty line between the headers and body. Without it you get a WEBrick::HTTPStatus::BadRequest error.