Process request custom headers

[ert78gb]

Description

The emulator is not process the custom headers from the request. The GCloud Functions is processes additional headers successful.

Steps to reproduce

1. create a function with console.log(JSON.stringify(req.headers)); command
2. deploy the function
3. call the function curl -X POST -H "Content-Type:application/json" -H "x-api-key: any" http://localhost:xx/end-point path -d '{"email": "[email protected]", "message":"test message" }'
4. check logs. functions logs read The x-api-key is missing. Only contains: {"host":"127.0.0.1:57515","accept-encoding":"gzip, deflate","user-agent":"node-superagent/3.4.1","content-type":"application/json","content-length":"53","connection":"close"} The x-api-key is missing
   <steps_to_reproduce>

Thanks!

[ert78gb]

thx, but I have not tested yet ;)