request cannot be fulfilled due to bad syntax
authentication is possible but has failed
payment required, reserved for future use
server refuses to respond to request
requested resource could not be found
request method not supported by that resource
content not acceptable according to the Accept headers
client must first authenticate itself with the proxy
server timed out waiting for the request
request could not be processed because of conflict
resource is no longer available and will not be available again
request did not specify the length of its content
server does not meet request preconditions
request is larger than the server is willing or able to process
URI provided was too long for the server to process
server does not support media type
client has asked for unprovidable portion of the file
server cannot meet requirements of Expect request-header field
request unable to be followed due to semantic errors
resource that is being accessed is locked
request failed due to failure of a previous request
client should switch to a different protocol
origin server requires the request to be conditional
user has sent too many requests in a given amount of time
server is unwilling to process the request
server returns no information and closes the connection
request should be retried after performing action
Windows Parental Controls blocking access to webpage
The server cannot reach the client's mailbox.
connection closed by client while HTTP server is processing