OptionalrequestThe user input serialized as a request object. The request object is unknown, so you cannot modify it directly. When work with request, you need to guard its type to e.g. HttpRequest with 'instanceof' operand
During the build phase of the execution of a middleware stack, a built request may or may not be available.
User input to a command. Reflects the userland representation of the union of data types the command can effectively handle.