Originally Posted by xenon

Actually, the POST forms have by default application/x-www-form-urlencoded as the enctype (multipart/form-data must be used in order to be able to upload files). The text/plain enctype specifies that the document in question (the form in your case) is a text container. Therefore, the form doesn't really exist anymore, as form data must be serialized before submitted to be processed server-side. Since you were using plain text as the form's contents, there was no data to submit.