Add Access-Control-Allow-Credentials for CORS settings

[TaichiHo]

This is a Feature Proposal

Description

Right now I am developing a cross origin resource sharing (CORS) application which requires sharing cookies. The server is required to return the Access-Control-Allow-Credentials header set to true to allow this. While there is way to set headers, methods and origins with serverless, there is no easy way of setting the allow-credentials header. Will have to go to aws console to enable this which is a headache for maintenance.

Similar or dependent issues:

Additional Data

• _Serverless Framework Version you're using_:
• _Operating System_:
• _Stack Trace_:
• _Provider Error messages_:

[IIapad0ks]

[str3tch]

+1, is there a fix for this anywhere?

[fruffin]

I needed that as well and now have an experimental version working for me.
I'll polish it a bit, write the tests and start the PR

[str3tch]

ha, I also have a rough and ready version too. need to polish it a lot, so you might beat me to it. Will be good to compare approaches

[fruffin]

Ready for review
Works on my machine! ;-)