Define custom HTTP headers in code

[aidansunbury]

Originally proposed here: iway1#27

[sudo-vaibhav]

another issue is headers are not able to be set via the gui (atleast on the demo app: https://trpc.aidansunbury.dev/?path=userRouter)

i tried adding a header but the ui keeps loosing focus

[aidansunbury]

another issue is headers are not able to be set via the gui (atleast on the demo app: trpc.aidansunbury.dev?path=userRouter)

i tried adding a header but the ui keeps loosing focus

That issue was actually fixed in #60, I've just been lazy and haven't updated the demo app to use the latest version of the package. I will update the CI/CD so that the demo app is always using the latest version.