Fix Headers interface
Fix Headers interface

SaschaNaz/TypeScript,mihailik/TypeScript,TukekeSoft/TypeScript,SaschaNaz/TypeScript,microsoft/TypeScript,kitsonk/TypeScript,alexeagle/TypeScript,RyanCavanaugh/TypeScript,TukekeSoft/TypeScript,donaldpipowitch/TypeScript,weswigham/TypeScript,Eyas/TypeScript,nojvek/TypeScript,synaptek/TypeScript,RyanCavanaugh/TypeScript,microsoft/TypeScript,basarat/TypeScript,kitsonk/TypeScript,Eyas/TypeScript,kpreisser/TypeScript,weswigham/TypeScript,nojvek/TypeScript,nojvek/TypeScript,Eyas/TypeScript,chuckjaz/TypeScript,synaptek/TypeScript,donaldpipowitch/TypeScript,nojvek/TypeScript,Eyas/TypeScript,kitsonk/TypeScript,synaptek/TypeScript,microsoft/TypeScript,chuckjaz/TypeScript,Microsoft/TypeScript,SaschaNaz/TypeScript,basarat/TypeScript,minestarks/TypeScript,donaldpipowitch/TypeScript,basarat/TypeScript,weswigham/TypeScript,TukekeSoft/TypeScript,donaldpipowitch/TypeScript,kpreisser/TypeScript,mihailik/TypeScript,chuckjaz/TypeScript,synaptek/TypeScript,mihailik/TypeScript,minestarks/TypeScript,RyanCavanaugh/TypeScript,minestarks/TypeScript,Microsoft/TypeScript,alexeagle/TypeScript,basarat/TypeScript,mihailik/TypeScript,chuckjaz/TypeScript,SaschaNaz/TypeScript,kpreisser/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript