Allows http router.attach() to be called more than once.
Allows http router.attach() to be called more than once.

fadeit/director,ks3dev/director,ks3dev/director,tanzhihang/director,pandoraui/director,maxogden/director,stonegithubs/director,andradedev/director,cpg1111/director,vitalsource/director,webx32/director,webx32/director,mylikes/director,pocketjoso/director,flatiron/director,lzhengms/director,GerHobbelt/director,tanzhihang/director,andradedev/director,pocketjoso/director,stonegithubs/director,GerHobbelt/director,sheldonzf/director,sheldonzf/director,lzhengms/director,fadeit/director,mylikes/director,meleslilijing/director,vitalsource/director,cpg1111/director,meleslilijing/director,kiritoe/director,kiritoe/director,pandoraui/director