Fix incorrect caching of 301/302 replies.
Fix incorrect caching of 301/302 replies.

Reported by J. P. Larocque.

darcs-hash:20061217221736-4cc09-02afd6ce78431649bb9c2a6fb200bddbd659e0d2.gz

galeksandrp/polipo,feijilei/polipo,berkley4/polipo,fqtools/polipo,Android-Apps/polipo,ajmgh/polipo,akkakks/polipo,clowwindy/polipo,toke/polipo,nxtreaming/chumen,lkraider/polipo,strongwillow/polipo,Android-Apps/polipo,ssb22/polipo2,gorakhargosh/polipo,dxq-git/polipo,feijilei/polipo,berkley4/polipo,lkraider/polipo,jeromelebel/polipo,fqtools/polipo,jech/polipo,doublec/namecoin-polipo,jech/polipo,galeksandrp/polipo,akkakks/polipo,nxtreaming/chumen,ssb22/polipo2,berkley4/polipo,danchr/polipo,fqtools/polipo,dxq-git/polipo,lkraider/polipo,jech/polipo,galeksandrp/polipo,fukusaka/polipo,strongwillow/polipo,caeies/polipo-caeies,akkakks/polipo,Psiphon-Inc/polipo,dxq-git/polipo,nxtreaming/chumen,TierraDelFuego/opilop,ssb22/polipo2,feijilei/polipo