+import httplib
+
+from tornado import web
+
+
+class Raiser(object):
+ code = httplib.OK
+
+ def __init__(self, reason):
+ raise web.HTTPError(self.code, reason)
+
+
+class BadRequest(Raiser):
+ code = httplib.BAD_REQUEST
+
+
+class Forbidden(Raiser):
+ code = httplib.FORBIDDEN
+
+
+class NotFound(Raiser):
+ code = httplib.NOT_FOUND
+
+
+class Unauthorized(Raiser):
+ code = httplib.UNAUTHORIZED
+
+
+class CodeTBD(object):
+ def __init__(self, code, reason):
+ raise web.HTTPError(code, reason)