The http protocol has the following methods:
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GET: Requests a representation of the specified resource (at the URI). The GET method is typically used to request a web page. It can also be used to call a web service.
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POST: Submits data to be processed (e.g. from an HTML form) to the specified resource (at the URI). The POST method is used typically when you submit a HTML form or call a web service.
To successfully call the web server using this method, the HTTP request must have the Content-Type header which describes how the post data is encoded. To do this the user would click on the Headers button in the request settings dialog and add the Content-Type header.