Added res.header() chaining test
Added res.header() chaining test

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