This is a request for better documentation regarding the closing of the
body in the http package as a side effect of writing.
After finding out I needed to call ParseForm before writing anything (if I
wanted the POSTed form) I went back to look at the documentation thinking I
had missed something obvious, but it's not clearly stated in any place I
checked. The closest is " Body is closed after it is sent." in the Write()
documentation, which is not the obvious thing to check when one seems to be
having a reading problem. FormValue, ParseForm and probably others should
mention this restriction.