All HTTP status codes

Every standard HTTP status code, what it means in plain English, and how to fix it when something goes wrong.

1xx Informational

100
Continue
The server received the request headers and is asking the client to continue.
 101
Switching Protocols
The server is switching protocols as requested by the client.
 102
Processing
The server has received and is processing the request, but no response is available yet.
 103
Early Hints
The server is sending preliminary headers before the final response.

2xx Success

200
OK
The request succeeded. The page loaded normally.
 201
Created
The request succeeded and a new resource was created.
 202
Accepted
The request was accepted but has not been processed yet.
 203
Non-Authoritative Information
The request succeeded, but the response was modified by a proxy.
 204
No Content
The request succeeded but there is no content to return.
 205
Reset Content
The request succeeded and the client should reset its view.
 206
Partial Content
The server is delivering only part of the resource.
 207
Multi-Status
The response contains multiple status codes for different operations.
 208
Already Reported
The members of a WebDAV binding have already been enumerated.
 226
IM Used
The server has fulfilled a GET request using delta encoding.

3xx Redirection

300
Multiple Choices
The request has multiple possible responses to choose from.
 301
Moved Permanently
The page has been permanently moved to a new URL.
 302
Found
The page has been temporarily moved to a different URL.
 303
See Other
The response can be found at a different URL using a GET request.
 304
Not Modified
The cached version of the resource is still valid.
 305
Use Proxy
The requested resource must be accessed through a proxy.
 307
Temporary Redirect
The page has temporarily moved, and the request method must not change.
 308
Permanent Redirect
The page has permanently moved, and the request method must not change.

4xx Client Error

400
Bad Request
The server could not understand the request due to a problem on the client side.
 401
Unauthorized
Authentication is required and either missing or invalid.
 402
Payment Required
Payment is required to access this resource.
 403
Forbidden
The server understood the request but refuses to authorize it.
 404
Not Found
The server could not find the requested page.
 405
Method Not Allowed
The HTTP method is not allowed for this resource.
 406
Not Acceptable
The server cannot produce a response matching the client's accept headers.
 407
Proxy Authentication Required
Authentication is required for the proxy server.
 408
Request Timeout
The server timed out waiting for the request.
 409
Conflict
The request conflicts with the current state of the server.
 410
Gone
The resource is permanently gone and will not return.
 411
Length Required
The server requires a Content-Length header.
 412
Precondition Failed
A precondition in the request headers was not met.
 413
Payload Too Large
The request body is larger than the server is willing to process.
 414
URI Too Long
The URL is longer than the server is willing to interpret.
 415
Unsupported Media Type
The server does not support the media type of the request.
 416
Range Not Satisfiable
The requested byte range cannot be served.
 417
Expectation Failed
The server cannot meet the requirements of the Expect header.
 418
I'm a teapot
The server refuses to brew coffee because it is a teapot.
 421
Misdirected Request
The request was directed to a server that cannot produce a response.
 422
Unprocessable Entity
The request was well-formed but contained semantic errors.
 423
Locked
The resource is locked and cannot be modified.
 424
Failed Dependency
The request failed because of a previous failed request.
 425
Too Early
The server is unwilling to risk processing a request that might be replayed.
 426
Upgrade Required
The client must upgrade to a different protocol.
 428
Precondition Required
The server requires the request to be conditional.
 429
Too Many Requests
The client has sent too many requests in a given time period.
 431
Request Header Fields Too Large
The request headers are too large for the server to process.
 451
Unavailable For Legal Reasons
The resource is unavailable due to legal restrictions.

5xx Server Error

500
Internal Server Error
The server encountered an unexpected error.
 501
Not Implemented
The server does not support the functionality required.
 502
Bad Gateway
The server received an invalid response from an upstream server.
 503
Service Unavailable
The server is temporarily unavailable, often due to overload or maintenance.
 504
Gateway Timeout
The upstream server did not respond in time.
 505
HTTP Version Not Supported
The server does not support the HTTP version used in the request.
 506
Variant Also Negotiates
The server has an internal configuration error in content negotiation.
 507
Insufficient Storage
The server cannot store the data needed to complete the request.
 508
Loop Detected
The server detected an infinite loop while processing the request.
 510
Not Extended
Further extensions to the request are required for the server to fulfill it.
 511
Network Authentication Required
The client must authenticate to access the network.