Add fix for 304 Not Modified
Add fix for 304 Not Modified

--HG--
branch : 1.2

ferd/lhttpc,cs-codesocial/lhttpc,spilgames/lhttpc,blt/lhttpc,Licenser/lhttpc,esl/fusco,SiftLogic/lhttpc,hirotnk/lhttpc,hukl/lhttpc,whisper1/lhttpc,waisbrot/lhttpc,lpgauth/lhttpc,talko/lhttpc