HTTP Status codes

1xx informational

  • 100 Client should continue with request
  • 101 Server is switching protocols
  • 102 Server has received and is processing the request
  • 103 resume aborted PUT or POST requests
  • 104 Connection reset by peer the closing a socket result in a RST rather than FIN.
  • 122 URI is longer than a maximum of 2083 characters

2xx success

  • 200 standard response for successful HTTP requests
  • 201 request has been fulfilled; new resource created
  • 202 request accepted, processing pending
  • 203 request processed, information may be from another source
  • 204 request processed, no content returned
  • 205 request processed, no content returned, reset document view
  • 206 partial resource return due to request header
  • 207 XMLl, can contain multiple separate responses
  • 208 results previously returned
  • 226 request fulfilled, reponse is instance-manipulations

3xx redirection

  • 300 multiple options for the resource delivered
  • 301 this and all future requests directed to the given URI
  • 302 response to request found via alternative URI
  • 303 response to request found via alternative URI
  • 304 resource has not been modified since last requested
  • 305 content located elsewhere, retrieve from there
  • 306 subsequent requests should use the specified proxy
  • 307 connect again to different uri as provided
  • 308 resumable HTTP Requests

4xx client error

  • 400 request cannot be fulfilled due to bad syntax
  • 401 authentication is possible but has failed
  • 402 payment required, reserved for future use
  • 403 server refuses to respond to request
  • 404 requested resource could not be found
  • 405 request method not supported by that resource
  • 406 content not acceptable according to the Accept headers
  • 407 client must first authenticate itself with the proxy
  • 408 server timed out waiting for the request
  • 409 request could not be processed because of conflict
  • 410 resource is no longer available and will not be available again
  • 411 request did not specify the length of its content
  • 412 server does not meet request preconditions
  • 413 request is larger than the server is willing or able to process
  • 414 URI provided was too long for the server to process
  • 415 server does not support media type
  • 416 client has asked for unprovidable portion of the file
  • 417 server cannot meet requirements of Expect request-header field
  • 418 I'm a teapot
  • 420 Twitter rate limiting
  • 422 request unable to be followed due to semantic errors
  • 423 resource that is being accessed is locked
  • 424 request failed due to failure of a previous request
  • 426 client should switch to a different protocol
  • 428 origin server requires the request to be conditional
  • 429 user has sent too many requests in a given amount of time
  • 431 server is unwilling to process the request
  • 444 server returns no information and closes the connection
  • 449 request should be retried after performing action
  • 450 Windows Parental Controls blocking access to webpage
  • 451 The server cannot reach the client's mailbox.
  • 499 connection closed by client while HTTP server is processing

5xx server error

  • 500 generic error message
  • 501 server does not recognise method or lacks ability to fulfill
  • 502 server received an invalid response from upstream server
  • 503 server is currently unavailable
  • 504 gateway did not receive response from upstream server
  • 505 server does not support the HTTP protocol version
  • 506 content negotiation for the request results in a circular reference
  • 507 server is unable to store the representation
  • 508 server detected an infinite loop while processing the request
  • 509 bandwidth limit exceeded
  • 510 further extensions to the request are required
  • 511 client needs to authenticate to gain network access
  • 598 network read timeout behind the proxy
  • 599 network connect timeout behind the proxy


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