BadRequest creates a new error response representing a bad request (HTTP 400).

Forbidden creates a new error response representing an authorization failure (HTTP 403).

Handler creates a middleware that handles panics and errors encountered during HTTP request processing.

InternalServerError creates a new error response representing an internal server error (HTTP 500).

InvalidInput creates a new error response representing a data validation error (HTTP 400).

NotFound creates a new error response representing a resource-not-found error (HTTP 404).

Unauthorized creates a new error response representing an authentication/authorization failure (HTTP 401).

Response is the response that represents an error.