Only add Vary header if there is more than one serializer
Only add Vary header if there is more than one serializer

dbabox/Nancy,fly19890211/Nancy,jchannon/Nancy,tparnell8/Nancy,nicklv/Nancy,jmptrader/Nancy,AcklenAvenue/Nancy,Crisfole/Nancy,EliotJones/NancyTest,sloncho/Nancy,NancyFx/Nancy,guodf/Nancy,dbolkensteyn/Nancy,murador/Nancy,lijunle/Nancy,tsdl2013/Nancy,sadiqhirani/Nancy,sroylance/Nancy,asbjornu/Nancy,Crisfole/Nancy,jeff-pang/Nancy,jchannon/Nancy,asbjornu/Nancy,AcklenAvenue/Nancy,sadiqhirani/Nancy,guodf/Nancy,nicklv/Nancy,blairconrad/Nancy,charleypeng/Nancy,AlexPuiu/Nancy,asbjornu/Nancy,dbabox/Nancy,jonathanfoster/Nancy,tparnell8/Nancy,wtilton/Nancy,davidallyoung/Nancy,xt0rted/Nancy,albertjan/Nancy,SaveTrees/Nancy,murador/Nancy,jeff-pang/Nancy,VQComms/Nancy,asbjornu/Nancy,AlexPuiu/Nancy,felipeleusin/Nancy,duszekmestre/Nancy,thecodejunkie/Nancy,anton-gogolev/Nancy,daniellor/Nancy,damianh/Nancy,xt0rted/Nancy,sadiqhirani/Nancy,felipeleusin/Nancy,Novakov/Nancy,lijunle/Nancy,sroylance/Nancy,anton-gogolev/Nancy,sloncho/Nancy,VQComms/Nancy,blairconrad/Nancy,AIexandr/Nancy,daniellor/Nancy,AlexPuiu/Nancy,tparnell8/Nancy,jmptrader/Nancy,AIexandr/Nancy,xt0rted/Nancy,dbolkensteyn/Nancy,albertjan/Nancy,jongleur1983/Nancy,malikdiarra/Nancy,felipeleusin/Nancy,horsdal/Nancy,MetSystem/Nancy,davidallyoung/Nancy,MetSystem/Nancy,hitesh97/Nancy,thecodejunkie/Nancy,cgourlay/Nancy,adamhathcock/Nancy,wtilton/Nancy,anton-gogolev/Nancy,jonathanfoster/Nancy,JoeStead/Nancy,tsdl2013/Nancy,dbolkensteyn/Nancy,ccellar/Nancy,jmptrader/Nancy,EIrwin/Nancy,khellang/Nancy,davidallyoung/Nancy,jongleur1983/Nancy,danbarua/Nancy,JoeStead/Nancy,tareq-s/Nancy,jchannon/Nancy,fly19890211/Nancy,sloncho/Nancy,NancyFx/Nancy,AlexPuiu/Nancy,VQComms/Nancy,tareq-s/Nancy,cgourlay/Nancy,JoeStead/Nancy,horsdal/Nancy,ayoung/Nancy,EIrwin/Nancy,SaveTrees/Nancy,phillip-haydon/Nancy,daniellor/Nancy,phillip-haydon/Nancy,joebuschmann/Nancy,rudygt/Nancy,rudygt/Nancy,adamhathcock/Nancy,hitesh97/Nancy,joebuschmann/Nancy,daniellor/Nancy,jonathanfoster/Nancy,xt0rted/Nancy,ayoung/Nancy,duszekmestre/Nancy,Worthaboutapig/Nancy,blairconrad/Nancy,SaveTrees/Nancy,malikdiarra/Nancy,ayoung/Nancy,AIexandr/Nancy,wtilton/Nancy,EliotJones/NancyTest,EliotJones/NancyTest,felipeleusin/Nancy,dbabox/Nancy,joebuschmann/Nancy,khellang/Nancy,phillip-haydon/Nancy,AcklenAvenue/Nancy,adamhathcock/Nancy,khellang/Nancy,tsdl2013/Nancy,kekekeks/Nancy,horsdal/Nancy,Crisfole/Nancy,AIexandr/Nancy,EliotJones/NancyTest,damianh/Nancy,albertjan/Nancy,EIrwin/Nancy,damianh/Nancy,charleypeng/Nancy,MetSystem/Nancy,jeff-pang/Nancy,duszekmestre/Nancy,NancyFx/Nancy,grumpydev/Nancy,jonathanfoster/Nancy,lijunle/Nancy,danbarua/Nancy,malikdiarra/Nancy,sadiqhirani/Nancy,tsdl2013/Nancy,sloncho/Nancy,sroylance/Nancy,murador/Nancy,jeff-pang/Nancy,fly19890211/Nancy,charleypeng/Nancy,asbjornu/Nancy,nicklv/Nancy,JoeStead/Nancy,phillip-haydon/Nancy,wtilton/Nancy,AIexandr/Nancy,cgourlay/Nancy,ccellar/Nancy,grumpydev/Nancy,davidallyoung/Nancy,cgourlay/Nancy,charleypeng/Nancy,vladlopes/Nancy,SaveTrees/Nancy,horsdal/Nancy,rudygt/Nancy,vladlopes/Nancy,thecodejunkie/Nancy,kekekeks/Nancy,Novakov/Nancy,ccellar/Nancy,Worthaboutapig/Nancy,hitesh97/Nancy,jongleur1983/Nancy,davidallyoung/Nancy,adamhathcock/Nancy,tareq-s/Nancy,VQComms/Nancy,malikdiarra/Nancy,murador/Nancy,ccellar/Nancy,jchannon/Nancy,danbarua/Nancy,charleypeng/Nancy,vladlopes/Nancy,lijunle/Nancy,albertjan/Nancy,fly19890211/Nancy,jongleur1983/Nancy,khellang/Nancy,dbabox/Nancy,EIrwin/Nancy,AcklenAvenue/Nancy,ayoung/Nancy,guodf/Nancy,sroylance/Nancy,hitesh97/Nancy,rudygt/Nancy,duszekmestre/Nancy,grumpydev/Nancy,Novakov/Nancy,blairconrad/Nancy,dbolkensteyn/Nancy,jmptrader/Nancy,guodf/Nancy,tareq-s/Nancy,Novakov/Nancy,Worthaboutapig/Nancy,anton-gogolev/Nancy,grumpydev/Nancy,kekekeks/Nancy,NancyFx/Nancy,joebuschmann/Nancy,Worthaboutapig/Nancy,MetSystem/Nancy,nicklv/Nancy,VQComms/Nancy,vladlopes/Nancy,jchannon/Nancy,danbarua/Nancy,thecodejunkie/Nancy,tparnell8/Nancy