Fixed Request#sendfile() 404 support even when a callback is available
Fixed Request#sendfile() 404 support even when a callback is available

dotnetCarpenter/express,nodejs-camp/booklog-polo,ci-test2/express,nodejs-camp/booklog-s890506,stevemao/express,wtony/express,angelsanz/express,bercanozcan/express,qitianchan/express,bercanozcan/express,1amageek/express,ahdinosaur/express,micha149/express,listepo/express,v10258/express,frank06/express,VegeChou/express,strongloop/express,Ju2ender/express,hpcslag/express,hacksparrow/express,chrisinajar/express,Matrixbirds/express,blainsmith/express,jimmykuo/express,dieuly/express,aifeld/express,frootloops/express,michaeljunlove/express,nodejs-camp/booklog-chenyou,sibura/express,vnglst/express,abhi3/express,TestingCI/express,fuse-mars/express,Flip120/express,jymsy/express,friederbluemle/express,1verson/express,pshomov/express,hightechweb/express,thepont/express,nodejs-camp/booklog-s890506,v10258/express,PUSEN/express,philxia/ex-tst-framework,Faiz7412/express,jenalgit/express,gdeividas/express,LestaD/express,KodkodGates/express,nodejs-camp/booklog-homa,fanzetao/express,corporateanon/express,youprofit/express,TestingCI/express,hanqingnan/express,nodejs-camp/booklog-linkchen,listepo/express,abdulhannanali/express,isaacs/express,dafabulousteach/express,gretac/express,jenia0jenia/express,saisai/express,hacksparrow/express,ericlu88/express,1amageek/express,JulyZhu/express,nodejs-camp/booklog-tonebeta,mauricionr/express,nodejs-camp/booklog-ben,vinodhalaharvi/express,lemelon/express,gretac/express,thepont/express,Riokai/express,xiaofuzi/express,awronka/express,blairzhang/express,fakedarren/express,weilixia/express,samuelcastro/express,tfe/express,1amageek/express,stoskov/express,gdeividas/express,udhayam/express,ralic/express,devgeniem/express,Ivanwangcy/express,za-creature/express,samuelcastro/express,andrejewski/express,luxe-eng/valet-express.express,nbeydoon/express,dotnetCarpenter/express,BaggersIO/express,XueQian/express,rgrove/express,andriyl/express,stoskov/express,nodejs-camp/booklog-Zak,evanlucas/express,btleffler/express,rgrove/express,hpcslag/express,XueQian/express,pstrike/express,chuym/express,Faiz7412/express,soyuka/express,gnowoel/express,vinodhalaharvi/express,jymsy/express,blainsmith/express,XueQian/express,adjohnson916/express,abhi3/express,dsupera13/express,blairzhang/express,hdngr/express,pathirana/express,vinodhalaharvi/express,lmtdit/express,WangCao/express,kunalpict/express,andrejewski/express,jinghuizhai/express,ZackBotkin/express,nodejs-camp/booklog-polo,sarvex/express,sujianping/express,mimaidms/express,nodejs-camp/booklog-ansaga,youprofit/express,dongseop/express,coreypnorris/express,mikewesthad/express,kawanet/express,PeterWangPo/express,CrazySherman/express,nodejs-camp/booklog-leo,kentcdodds/express,kunalpict/express,Haru1990/express,nodejs-camp/booklog-ansaga,Kevnz/express,dieuly/express,lian774739140/express,kubrickology/express,vnglst/express,sarvex/express,luxe-eng/valet-express.express,juandav/express,lemelon/express,VegeChou/express,srichatala/express,simudream/express,junxiong/express,stewartml/express,simplyianm/express,Eric-Vandenberg/express,RanadeepPolavarapu/express,flomotlik/express,buildsample/express,wtony/express,vidyar/express,jenia0jenia/express,bercanozcan/express,ericlu88/express,svnh/express,mcanthony/express,ci-test2/express,jenalgit/express,bjrmatos/express,dreamingblackcat/express,nodejs-camp/booklog-jollen,juanpastas/express,listepo/express,junxiong/express,stewartml/express,tianhengzhou/express,xiaofuzi/express,leiqiang75/express,hl198181/express,blakeembrey/express,juandav/express,topaxi/express,auth0/express,rupanjanbaidya/express,svnh/express,demohi/express,nbeydoon/express,micha149/express,sujianping/express,kunalpict/express,ZackBotkin/express,awronka/express,evilboss/express,r14r-work/fork_express_master,nodejs-camp/booklog-jason,igarciaes/express,grigorkh/express,ifraixedes/express,dotnetCarpenter/express,qq645381995/express,heicx/express,srichatala/express,stewartml/express,MoraLin/mora-test,Riokai/express,FernAbby/express,fineday32/express,mauricionr/express,buildsample/express,evilboss/express,swarajgiri/express,jinghuizhai/express,maraoz/express,angelsanz/express,topaxi/express,btleffler/express,mcanthony/express,drzorm/express,ahdinosaur/express,featurist/express,juanpastas/express,BaggersIO/express,stoskov/express,Lexine/express,hanweifish/express,Ju2ender/express,lian774739140/express,pstrike/express,bjrmatos/express,nodejs-camp/booklog-tonebeta,Talkyunyun/express,nodejs-camp/booklog-archer,jenia0jenia/express,fakedarren/express,llwanghong/express,jenalgit/express,devgeniem/express,junxiong/express,Ju2ender/express,nodejs-camp/booklog-ausir,Talkyunyun/express,benshiue/booklog-ben,nodejs-camp/booklog-jollen,gnowoel/express,nodejs-camp/booklog-ben,saisai/express,udhayam/express,nodejs-camp/booklog-mora,nathan818fr/express,vnglst/express,adjohnson916/express,gnowoel/express,smcmurray/express,auth0/express,nodejs-camp/booklog-linkchen,friederbluemle/express,Lexine/express,friederbluemle/express,chrisinajar/express,christopheranderson/express,tjmehta/express,codeforgeek/express,philxia/ex-tst-framework,nodejs-camp/booklog-leo,WangCao/express,neomadara/express,dsupera13/express,ZackBotkin/express,r14r-work/fork_express_master,dongseop/express,fakedarren/express,qitianchan/express,RanadeepPolavarapu/express,nodejs-camp/booklog-chle,Haru1990/express,stevemao/express,neomadara/express,sibura/express,LestaD/express,nbeydoon/express,swstack/express,isaacs/express,danielrohers/express,benshiue/booklog-ben,blairzhang/express,RickyDan/express,fineday32/express,ci-test2/express,blakeembrey/express,robomc/express,ralic/express,fuse-mars/express,elkingtonmcb/express,hanweifish/express,nathan818fr/express,llwanghong/express,za-creature/express,mikewesthad/express,BaggersIO/express,supasate/express,frank06/express,dafabulousteach/express,methuz/express,nodejs-camp/booklog-Zak,danielrohers/express,kylezhang/express,angelsanz/express,Flip120/express,Kevnz/express,KodkodGates/express,simudream/express,nodejs-camp/booklog-polo,dreamingblackcat/express,r14r/fork_express_master,baldurh/express,pshomov/express,dgofman/express,supasate/express,microlv/express,CrazySherman/express,featurist/express,countdracular/express,WangCao/express,robomc/express,chuym/express,andriyl/express,nodejs-camp/booklog-ausir,coreypnorris/express,philxia/ex-tst-framework,HXYNODE/express,Eric-Vandenberg/express,nodejs-camp/booklog-chle,hpcslag/express,caiocutrim/express,HXYNODE/express,featurist/express,lmtdit/express,devgeniem/express,emvici/emvici-reqres-tify,Flip120/express,codeforgeek/express,Matrixbirds/express,frootloops/express,yinhe007/express,abhi3/express,simplyianm/express,MoraLin/mora-test,evilboss/express,smcmurray/express,JulyZhu/express,nodejs-camp/booklog-mora,igarciaes/express,YR/express,nodejs-camp/booklog-homa,wtony/express,za-creature/express,Riokai/express,christopheranderson/express,FernAbby/express,pathirana/express,hdngr/express,v10258/express,hdngr/express,baldurh/express,evanlucas/express,nodejs-camp/booklog-chenyou,demohi/express,fanzetao/express,tyler-johnson/express,wesleytodd/express,luxe-eng/valet-express.express,xiaofuzi/express,KodkodGates/express,abdulhannanali/express,kentcdodds/express,youprofit/express,hightechweb/express,nodejs-camp/booklog-archer,swarajgiri/express,expressjs/express,grigorkh/express,corporateanon/express,soyuka/express,dongseop/express,shanawarkhan/express,brianloveswords/express,WebStyle/express,LestaD/express,buildsample/express,michaeljunlove/express,leiqiang75/express,grigorkh/express,jimmykuo/express,wesleytodd/express,blakeembrey/express,microlv/express,abdulhannanali/express,vidyar/express,tjmehta/express,smcmurray/express,weilixia/express,shanawarkhan/express,supasate/express,maraoz/express,sarvex/express,yinhe007/express,nodejs-camp/booklog-tonebeta-update,expressjs/express,dafabulousteach/express,caiocutrim/express,cflynn07/express,flomotlik/express,nodejs-camp/booklog-tonebeta-update,kylezhang/express,kubrickology/express,aifeld/express,YR/express,tianhengzhou/express,maraoz/express,Eric-Vandenberg/express,tyler-johnson/express,swstack/express,1verson/express,jinghuizhai/express,dreamingblackcat/express,xtidt/express,r14r/fork_express_master,Faiz7412/express,simudream/express,svnh/express,stevemao/express,strongloop/express,xtidt/express,cflynn07/express,topaxi/express,Jonekee/express,hl198181/express,kawanet/express,qitianchan/express,dgofman/express,ifraixedes/express,mimaidms/express,elkingtonmcb/express,kylezhang/express,chrisinajar/express,vidyar/express,countdracular/express,corporateanon/express,dongooo/express,nodejs-camp/booklog-jason,swarajgiri/express,PeterWangPo/express,drzorm/express,qq645381995/express,michaeljunlove/express,dongooo/express,philxia/ex-tst-framework,hanqingnan/express,PUSEN/express,rupanjanbaidya/express,heicx/express,qq645381995/express,lmtdit/express,WebStyle/express,Jonekee/express,TestingCI/express,methuz/express,Ivanwangcy/express,RickyDan/express,coreypnorris/express