Fixed a typo in `src/slave/http.cpp`.
Fixed a typo in `src/slave/http.cpp`.

abudnik/mesos,kaysoky/mesos,craimbert/mesos,craimbert/mesos,verizonlabs/mesos,Aman-Jain-14/customizedMesos,dforsyth/mesos,gsantovena/mesos,abudnik/mesos,zmalik/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,verizonlabs/mesos,chhsia0/mesos,verizonlabs/mesos,zmalik/mesos,jpeach/mesos,Aman-Jain-14/customizedMesos,Gilbert88/mesos,neilconway/mesos,reneploetz/mesos,yuquanshan/customizedMesos,zmalik/mesos,reneploetz/mesos,yuquanshan/customizedMesos,gsantovena/mesos,reneploetz/mesos,kaysoky/mesos,andschwa/mesos,jpeach/mesos,andschwa/mesos,Gilbert88/mesos,gsantovena/mesos,asamerh4/mesos,verizonlabs/mesos,neilconway/mesos,yuquanshan/customizedMesos,gsantovena/mesos,andschwa/mesos,kaysoky/mesos,chhsia0/mesos,gsantovena/mesos,craimbert/mesos,kaysoky/mesos,craimbert/mesos,Gilbert88/mesos,neilconway/mesos,zmalik/mesos,yuquanshan/customizedMesos,reneploetz/mesos,zmalik/mesos,verizonlabs/mesos,chhsia0/mesos,craimbert/mesos,yuquanshan/customizedMesos,verizonlabs/mesos,neilconway/mesos,verizonlabs/mesos,chhsia0/mesos,Aman-Jain-14/customizedMesos,dforsyth/mesos,andschwa/mesos,jpeach/mesos,reneploetz/mesos,andschwa/mesos,abudnik/mesos,asamerh4/mesos,craimbert/mesos,Gilbert88/mesos,dforsyth/mesos,neilconway/mesos,Aman-Jain-14/customizedMesos,Gilbert88/mesos,yuquanshan/customizedMesos,gsantovena/mesos,dforsyth/mesos,zmalik/mesos,asamerh4/mesos,asamerh4/mesos,kaysoky/mesos,neilconway/mesos,kaysoky/mesos,abudnik/mesos,craimbert/mesos,abudnik/mesos,chhsia0/mesos,kaysoky/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,Gilbert88/mesos,zmalik/mesos,dforsyth/mesos,Gilbert88/mesos,asamerh4/mesos,abudnik/mesos,Aman-Jain-14/customizedMesos,gsantovena/mesos,andschwa/mesos,dforsyth/mesos,jpeach/mesos,chhsia0/mesos,asamerh4/mesos,andschwa/mesos,jpeach/mesos,chhsia0/mesos,reneploetz/mesos,reneploetz/mesos,yuquanshan/customizedMesos,abudnik/mesos,neilconway/mesos,jpeach/mesos,dforsyth/mesos