# Functions
BadRequest - creates a new APIError with status code 400.
Forbidden - creates a new APIError with status code 403.
InternalServerError - creates a new APIError with status code 500.
New - creates a new APIError.
NotFound - creates a new APIError with status code 404.
Unauthorized - creates a new APIError with status code 401.
UnprocessableContent - creates a new APIError with status code 422.
# Constants
ExtraContextKey - the key used to store extra information in the context.