Replace some 503 with 502.
Replace some 503 with 502.

darcs-hash:20080330184517-4cc09-c956fd43c5fbc24bcc9a5a59328bac739b5926d2.gz

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