Initializes a page redirect exception.
| Parameters | code | Refers to an HTTP status code, for example http.NOT_FOUND. 
If no message is given, code is mapped to a 
descriptive string that is used instead.
 (type: str
) | 
 | message | A short error message, for example "NOT FOUND".
 (type: str
) | 
 | response | A complete HTML document for an error page.
 (type: str
) | 
 | location | The location response-header field value. It is an absolute URI used to 
redirect the receiver to a location other than the Request-URI so the 
request can be completed.
 (type: str
) |