fixes #1826: res.redirect('toString') fails with 500
fixes #1826: res.redirect('toString') fails with 500

Removed the unused map and corrected the doc comment.
nodejs-camp/booklog-archer,shanawarkhan/express,maraoz/express,Jonekee/express,flomotlik/express,dreamingblackcat/express,dongseop/express,buildsample/express,fakedarren/express,pstrike/express,nodejs-camp/booklog-ben,jinghuizhai/express,nodejs-camp/booklog-s890506,wesleytodd/express,FernAbby/express,nodejs-camp/booklog-ansaga,ZackBotkin/express,KodkodGates/express,llwanghong/express,nodejs-camp/booklog-tonebeta,tianhengzhou/express,devgeniem/express,dsupera13/express,gdeividas/express,ifraixedes/express,BaggersIO/express,countdracular/express,topaxi/express,maraoz/express,nbeydoon/express,PeterWangPo/express,jenalgit/express,featurist/express,fakedarren/express,xtidt/express,srichatala/express,youprofit/express,hl198181/express,christopheranderson/express,codeforgeek/express,ericlu88/express,1amageek/express,grigorkh/express,demohi/express,emvici/emvici-reqres-tify,wtony/express,dotnetCarpenter/express,v10258/express,fuse-mars/express,frootloops/express,mcanthony/express,Flip120/express,nodejs-camp/booklog-polo,dsupera13/express,smcmurray/express,swarajgiri/express,auth0/express,stewartml/express,abhi3/express,stevemao/express,stewartml/express,svnh/express,codeforgeek/express,CrazySherman/express,sarvex/express,btleffler/express,mauricionr/express,1amageek/express,aifeld/express,friederbluemle/express,stevemao/express,countdracular/express,qitianchan/express,nodejs-camp/booklog-chle,listepo/express,dieuly/express,elkingtonmcb/express,vidyar/express,Faiz7412/express,r14r-work/fork_express_master,fuse-mars/express,lian774739140/express,micha149/express,rgrove/express,weilixia/express,tjmehta/express,nodejs-camp/booklog-tonebeta-update,mcanthony/express,jenia0jenia/express,dgofman/express,RanadeepPolavarapu/express,wesleytodd/express,kentcdodds/express,simplyianm/express,fanzetao/express,adjohnson916/express,philxia/ex-tst-framework,blairzhang/express,nodejs-camp/booklog-homa,xiaofuzi/express,swarajgiri/express,Jonekee/express,fakedarren/express,ralic/express,gdeividas/express,TestingCI/express,jinghuizhai/express,JulyZhu/express,lian774739140/express,YR/express,Lexine/express,pathirana/express,Haru1990/express,juanpastas/express,swstack/express,Flip120/express,philxia/ex-tst-framework,LestaD/express,evilboss/express,KodkodGates/express,svnh/express,JulyZhu/express,RanadeepPolavarapu/express,YR/express,kubrickology/express,kylezhang/express,udhayam/express,Eric-Vandenberg/express,coreypnorris/express,sarvex/express,ci-test2/express,LestaD/express,Faiz7412/express,hpcslag/express,hacksparrow/express,hacksparrow/express,fanzetao/express,hl198181/express,qitianchan/express,vinodhalaharvi/express,nodejs-camp/booklog-linkchen,Lexine/express,za-creature/express,ZackBotkin/express,mimaidms/express,featurist/express,elkingtonmcb/express,smcmurray/express,dongooo/express,pathirana/express,caiocutrim/express,abdulhannanali/express,blairzhang/express,Ju2ender/express,cflynn07/express,blakeembrey/express,demohi/express,corporateanon/express,hdngr/express,Eric-Vandenberg/express,BaggersIO/express,WangCao/express,WangCao/express,v10258/express,topaxi/express,TestingCI/express,simudream/express,simplyianm/express,PUSEN/express,soyuka/express,udhayam/express,expressjs/express,smcmurray/express,kylezhang/express,mauricionr/express,saisai/express,r14r/fork_express_master,methuz/express,gretac/express,kylezhang/express,philxia/ex-tst-framework,rupanjanbaidya/express,mikewesthad/express,XueQian/express,cflynn07/express,dieuly/express,jimmykuo/express,nodejs-camp/booklog-Zak,mikewesthad/express,devgeniem/express,adjohnson916/express,lemelon/express,chuym/express,nodejs-camp/booklog-linkchen,jenia0jenia/express,jimmykuo/express,igarciaes/express,christopheranderson/express,vinodhalaharvi/express,michaeljunlove/express,WebStyle/express,blakeembrey/express,xiaofuzi/express,vnglst/express,thepont/express,stoskov/express,youprofit/express,drzorm/express,nodejs-camp/booklog-leo,philxia/ex-tst-framework,XueQian/express,v10258/express,juandav/express,tjmehta/express,qq645381995/express,vidyar/express,chrisinajar/express,nodejs-camp/booklog-homa,microlv/express,lmtdit/express,sibura/express,nodejs-camp/booklog-polo,supasate/express,samuelcastro/express,WangCao/express,strongloop/express,hpcslag/express,ifraixedes/express,llwanghong/express,coreypnorris/express,heicx/express,robomc/express,sujianping/express,vnglst/express,RickyDan/express,dongseop/express,nodejs-camp/booklog-tonebeta,stevemao/express,evanlucas/express,nodejs-camp/booklog-leo,Ju2ender/express,listepo/express,nodejs-camp/booklog-chenyou,dafabulousteach/express,gnowoel/express,VegeChou/express,andriyl/express,andriyl/express,dafabulousteach/express,1amageek/express,rgrove/express,auth0/express,igarciaes/express,simudream/express,dafabulousteach/express,fineday32/express,caiocutrim/express,hdngr/express,r14r-work/fork_express_master,methuz/express,tyler-johnson/express,gnowoel/express,Ju2ender/express,tianhengzhou/express,topaxi/express,flomotlik/express,grigorkh/express,yinhe007/express,nodejs-camp/booklog-jollen,nbeydoon/express,kunalpict/express,srichatala/express,kunalpict/express,svnh/express,strongloop/express,evanlucas/express,nodejs-camp/booklog-tonebeta-update,michaeljunlove/express,PUSEN/express,ahdinosaur/express,benshiue/booklog-ben,wtony/express,hanweifish/express,danielrohers/express,jenia0jenia/express,mimaidms/express,supasate/express,dreamingblackcat/express,samuelcastro/express,supasate/express,vinodhalaharvi/express,blakeembrey/express,Matrixbirds/express,Riokai/express,listepo/express,wtony/express,Talkyunyun/express,coreypnorris/express,micha149/express,bercanozcan/express,nodejs-camp/booklog-ausir,btleffler/express,leiqiang75/express,nodejs-camp/booklog-chenyou,Kevnz/express,KodkodGates/express,fineday32/express,za-creature/express,HXYNODE/express,r14r/fork_express_master,aifeld/express,dotnetCarpenter/express,Riokai/express,junxiong/express,stoskov/express,baldurh/express,danielrohers/express,awronka/express,rupanjanbaidya/express,kubrickology/express,angelsanz/express,youprofit/express,hanqingnan/express,awronka/express,nathan818fr/express,juanpastas/express,nodejs-camp/booklog-ausir,gnowoel/express,luxe-eng/valet-express.express,lemelon/express,expressjs/express,sibura/express,sujianping/express,neomadara/express,Eric-Vandenberg/express,tyler-johnson/express,bjrmatos/express,xtidt/express,dotnetCarpenter/express,featurist/express,XueQian/express,1verson/express,corporateanon/express,MoraLin/mora-test,PeterWangPo/express,jinghuizhai/express,lmtdit/express,nodejs-camp/booklog-mora,abhi3/express,evilboss/express,buildsample/express,ZackBotkin/express,MoraLin/mora-test,nathan818fr/express,heicx/express,swarajgiri/express,bercanozcan/express,weilixia/express,VegeChou/express,blainsmith/express,pstrike/express,Matrixbirds/express,junxiong/express,vnglst/express,andrejewski/express,Ivanwangcy/express,qitianchan/express,nodejs-camp/booklog-archer,ci-test2/express,saisai/express,blairzhang/express,WebStyle/express,grigorkh/express,leiqiang75/express,hpcslag/express,hanweifish/express,Haru1990/express,CrazySherman/express,nodejs-camp/booklog-jollen,nbeydoon/express,Faiz7412/express,hanqingnan/express,ralic/express,jenalgit/express,juandav/express,maraoz/express,pshomov/express,benshiue/booklog-ben,nodejs-camp/booklog-jason,nodejs-camp/booklog-jason,abdulhannanali/express,1verson/express,ahdinosaur/express,qq645381995/express,buildsample/express,microlv/express,robomc/express,yinhe007/express,dongseop/express,jenalgit/express,frootloops/express,Talkyunyun/express,corporateanon/express,evilboss/express,hightechweb/express,bercanozcan/express,andrejewski/express,stoskov/express,michaeljunlove/express,hightechweb/express,baldurh/express,luxe-eng/valet-express.express,Flip120/express,nodejs-camp/booklog-ansaga,chuym/express,simudream/express,HXYNODE/express,jymsy/express,angelsanz/express,shanawarkhan/express,vidyar/express,TestingCI/express,chrisinajar/express,friederbluemle/express,abdulhannanali/express,hdngr/express,dgofman/express,stewartml/express,nodejs-camp/booklog-Zak,LestaD/express,friederbluemle/express,BaggersIO/express,angelsanz/express,xiaofuzi/express,Riokai/express,gretac/express,kunalpict/express,Ivanwangcy/express,ci-test2/express,nodejs-camp/booklog-mora,chrisinajar/express,FernAbby/express,devgeniem/express,nodejs-camp/booklog-chle,RickyDan/express,thepont/express,sarvex/express,bjrmatos/express,neomadara/express,za-creature/express,soyuka/express,drzorm/express,lmtdit/express,nodejs-camp/booklog-ben,qq645381995/express,luxe-eng/valet-express.express,blainsmith/express,dongooo/express,jymsy/express,nodejs-camp/booklog-s890506,swstack/express,dreamingblackcat/express,pshomov/express,Kevnz/express,junxiong/express,nodejs-camp/booklog-polo,abhi3/express,kentcdodds/express,ericlu88/express