HTTP Messages

# HTTP Status Messages

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When a browser requests a service from a web server, an error might occur.

This is a list of HTTP status messages that might be returned:

## 1xx: Information

Message: | Description:
--- | ---
100 Continue | The server has received the request headers, and the client should proceed to send the request body
101 Switching Protocols | The requester has asked the server to switch protocols
103 Checkpoint | Used in the resumable requests proposal to resume aborted PUT or POST requests

## 2xx: Successful

Message: | Description:
--- | ---
200 OK | The request is OK (this is the standard response for successful HTTP requests)
201 Created | The request has been fulfilled, and a new resource is created
202 Accepted | The request has been accepted for processing, but the processing has not been completed
203 Non-Authoritative Information | The request has been successfully processed, but is returning information that may be from another source
204 No Content | The request has been successfully processed, but is not returning any content
205 Reset Content | The request has been successfully processed, but is not returning any content, and requires that the requester reset the document view
206 Partial Content | The server is delivering only part of the resource due to a range header sent by the client

## 3xx: Redirection

Message: | Description:
--- | ---
300 Multiple Choices | A link list. The user can select a link and go to that location. Maximum five addresses
301 Moved Permanently | The requested page has moved to a new URL
302 Found | The requested page has moved temporarily to a new URL
303 See Other | The requested page can be found under a different URL
304 Not Modified | Indicates the requested page has not been modified since last requested
306 Switch Proxy | No longer used
307 Temporary Redirect | The requested page has moved temporarily to a new URL
308 Resume Incomplete | Used in the resumable requests proposal to resume aborted PUT or POST requests

## 4xx: Client Error

Message: | Description:
--- | ---
400 Bad Request | The request cannot be fulfilled due to bad syntax
401 Unauthorized | The request was a legal request, but the server is refusing to respond to it. For use when authentication is possible but has failed or not yet been provided
402 Payment Required | Reserved for future use
403 Forbidden | The request was a legal request, but the server is refusing to respond to it
404 Not Found | The requested page could not be found but may be available again in the future
405 Method Not Allowed | A request was made of a page using a request method not supported by that page
406 Not Acceptable | The server can only generate a response that is not accepted by the client
407 Proxy Authentication Required | The client must first authenticate itself with the proxy
408 Request Timeout | The server timed out waiting for the request
409 Conflict | The request could not be completed because of a conflict in the request
410 Gone | The requested page is no longer available
411 Length Required | The "Content-Length" is not defined. The server will not accept the request without it
412 Precondition Failed | The precondition given in the request evaluated to false by the server
413 Request Entity Too Large | The server will not accept the request, because the request entity is too large
414 Request-URI Too Long | The server will not accept the request, because the URL is too long. Occurs when you convert a POST request to a GET request with a long query information
415 Unsupported Media Type | The server will not accept the request, because the media type is not supported
416 Requested Range Not Satisfiable | The client has asked for a portion of the file, but the server cannot supply that portion
417 Expectation Failed | The server cannot meet the requirements of the Expect request-header field

## 5xx: Server Error

Message: | Description:
--- | ---
500 Internal Server Error | A generic error message, given when no more specific message is suitable
501 Not Implemented | The server either does not recognize the request method, or it lacks the ability to fulfill the request
502 Bad Gateway | The server was acting as a gateway or proxy and received an invalid response from the upstream server
503 Service Unavailable | The server is currently unavailable (overloaded or down)
504 Gateway Timeout | The server was acting as a gateway or proxy and did not receive a timely response from the upstream server
505 HTTP Version Not Supported | The server does not support the HTTP protocol version used in the request
511 Network Authentication Required | The client needs to authenticate to gain network access

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