Error modes.

[asheshambasta]

Needed for the user error response fixes.

May need minor adjustments based on actual use (which I'm working on next).

--

This will let us start servers with the correct mode and respond with
errors in HTML or in JSON, depending on the use case.

A future improvement would be to do this via a middleware: and detect
the mode based off the the client's "Accept" header.

[noteed]

This will let us start servers with the correct mode and respond with errors in HTML or in JSON, depending on the use case.

Do you mean something like cty-serve --html and cty-serve --json ?

A future improvement would be to do this via a middleware: and detect the mode based off the the client's "Accept" header.

I think Servant already support detecting the "Accept" header and I've used it here in start-servant:
https://github.com/noteed/start-servant/blob/main/src/Prototype/Server/Legacy.hs#L57

[asheshambasta]

@noteed putting this on hold until further research based on today's discussion.