Add HTTP 304 support to source maps server
Add HTTP 304 support to source maps server

wied03/opal,jannishuebl/opal,iliabylich/opal,c42engineering/opal,Mogztter/opal,suyesh/opal,kachick/opal,Mogztter/opal,jannishuebl/opal,gabrielrios/opal,wied03/opal,kachick/opal,castwide/opal,fazibear/opal,Flikofbluelight747/opal,kachick/opal,suyesh/opal,suyesh/opal,bbatsov/opal,Ajedi32/opal,Ajedi32/opal,opal/opal,wied03/opal,merongivian/opal,bbatsov/opal,opal/opal,opal/opal,merongivian/opal,merongivian/opal,Flikofbluelight747/opal,c42engineering/opal,iliabylich/opal,gabrielrios/opal,gabrielrios/opal,gausie/opal,Flikofbluelight747/opal,gausie/opal,jgaskins/opal,Mogztter/opal,castwide/opal,opal/opal,Mogztter/opal,Ajedi32/opal,kachick/opal,jgaskins/opal,bbatsov/opal,c42engineering/opal,jgaskins/opal,gausie/opal,castwide/opal,fazibear/opal,iliabylich/opal,fazibear/opal,jannishuebl/opal