ClientHTTPStatusAndError returns error and http status that is "safe" to return to client without exposing any implementation details.

NewPrepopulateMiddleware creates a middleware which will parse incoming http forms.

ResponseJSONMiddleware sets the Content-Type header to JSON if it's not set.

WriteError write a go error with the correct status code.

StatusClientClosedRequest is the status code for when a client request cancellation of an http request.