Fixed incompliance of AB when used with a proxy as reported by

Fixed incompliance of AB when used with a proxy as reported by
Taisuke Yamada <tai@iij.ad.jp>. Added error trapping to the
write function (important on systems with defered errors
after a connect). Documented the weakness of the write()
function - it assumes the whole RQ can always be fully
written to the socket. Fixed a compiler warning which
pointed out that 'bad' was both a label and a variable.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@94354 13f79535-47bb-0310-9956-ffa450edef68