||The server, while acting as a gateway or proxy, received an invalid response
from the upstream server it accessed in attempting to fulfill the request.
||The request could not be understood by the server due to malformed syntax.
||The request could not be completed due to a conflict with the current state
of the resource.
||The server, while acting as a gateway or proxy, did not receive a timely
response from the upstream server specified by the URI (e.g.
||The requested resource is no longer available at the server and no forwarding
address is known.
||The server encountered an unexpected condition which prevented it from
fulfilling the request.
||The method specified in the Request-Line is not allowed for the resource
identified by the request-target.
||The resource identified by the request is only capable of generating response
entities which have content characteristics not acceptable according to the
accept headers sent in the request.
||The server has not found anything matching the request-target.
||The server does not support the functionality required to fulfill the
||Base class for HTTP exceptions.
||The server is currently unable to handle the request due to a temporary
overloading or maintenance of the server.
||The server is refusing to service the request because the entity of the
request is in a format not supported by the requested resource for the