List Of HTTP Response Codes

HTTP response codes are given to the browser whenever the browser completes a task. These messages can be anything from a resource loading correctly, or your contact form failing to submit. The browser normally does not show these responces unless they are errors, although you can find a log of them if you wish. However, if an error occurs, you can easily find it in the console, and possibly display on-screen. You can learn how to set custom error pages here.

Levels of response codes

Did you know that the first number of an HTTP response will tell you what category the message is in? If you didn’t, you do now! There are five different categories, beginning with the number one, two, three, four, and five respectively. Makes sense right?

Responses beginning with one are informative responses. If it begins with the number two, it’s a successful response. Beginning with a three means that it is a redirect. If it begins with a four, that means there was a client error. Lastly, a response beginning with a five means there was a server error. Confused? Check out the table below.

Begins with a one (1) Informative 100-199 Response codes
Begins with a two (2) Success 200-299 Response codes
Begins with a three (3) Redirect 300-399 Response codes
Begins with a four (4) Client Error 400-499 Response codes
Begins with a five (5) Server Error 500-599 Response codes

Advertisement

TinkerAd

List of all response codes

Informative Responses (100-199)

Code Meaning Description
100 Continue A response meaning that everything is working properly, and the client computer should continue requesting information, unless all requests have been completed
101 Switching Protocols Indicating that the protocol is switching, and providing the new protocol to connect with
102 Processing Indicating that the server has received and is processing the request, but no other information is available yet
103 Early Hints Used to return various response headers before main content load. Not compatible with most browsers.

Successful Responses (200-299)

Code Meaning Description
200 OK The request has succeeded
201 Created Typically sent after POST requests, this response means that the request has succeeded, and as a result, a new resource has been created
202 Accepted The server has received the request, but has not begun processing it. Typically used when multiple servers are used to accept and progress requests
203 Non-Authoritative Information Returned meta-information is not the same from the origin server, and is collected locally or from a third party. Unless those requirements are met, a “200 - OK” code is used instead
204 No Content No content is available to send for the request. The user-agent device may update cache-headers for this resource
205 Reset Content Informing the user-agent device to reset the document that sent the request
206 Partial Content An XML message that by default contains a number of separate response codes depending on the number of sub-requests were made
207 Multi Status Used when the Range header sent from the client requests only part of the resource
208 Already Reported Members of a DAV binding have already been received in an earlier part of the multistatus response, and are not being included again
226 IM Used The server has completed a resource request, and the response is a representation of the result of one or more instance-manipulations applied to the current instance

Redirection Responses (300-399)

Code Meaning Description
300 Multiple Choices Used when the request has multiple possible responses. The user-agent is then responsible for selecting a response
301 Moved Permanently The requested URL has been permanently moved. Directs the user-agent to update the cache to reflect changes
302 Found The requested URI has been temporarily moved. Future changes may be made, and cache should not be updated
303 See Other This response is used when the server requests the client to get a requested resource elsewhere with a GIT parameter
304 Not Modified Used for caching purposes. This response tells the client that the response has not been changed, so the client can continue its use of the cached version
307 Temporary Redirect A response used to direct the client to a different resource at a different URI using the same method
308 Permanent Redirect The resource has been permanently moved. Similar to “301 - Moved Permanently”, except the user-agent cannot change the request method

Advertisement

TinkerAd

Client Error Responses (400-499)

Code Meaning Description
400 Bad Request Learn More - The server could not understand the request
401 Unauthorized Learn More - Technically “Aunauthorcated“. Meaning that the client needs to authenticate to gain access
402 Payment Required Reserved for future use. The idea was to use it for online payment, but the code is rarely used, and in some instances, not implemented
403 Forbidden Learn More - The client does not have the rights to access this content. Learn how to customize the error page
404 Not Found Learn More - The most common 400 error code. Per it’s name, the response means that the requested resource cannot be found. Learn how to customize this error page
405 Method Not Allowed The methods used in the request are supported on the server, but are not supported by the resource
406 Not Acceptable Sent when the server doesn’t find any matching content after performing server-driven content negotiation
407 Proxy Authorization Required Similar to “401 - Unauthorized” except authorization must be completed by a proxy
408 Request Timeout Learn More - Used when the server wished to close the connection. Sometimes sent on idle server connections. Some servers do not send the message, but abruptly shut down instead
409 Conflict A response sent when a request conflicts with the server
410 Gone Response returned when requested content has been removed from the server, without a forwarding address listed. The user agent should purge any cache on the resource
411 Length Required Used when the “Content Length” header is not defined, but the server requires it
412 Precondition Failed Client has conditions defined in the headers that the server does not meet
413 Payload Too Large Request is larger than server defined limits. The server may close the connection or send a 409 responce
414 URI Too Long Used when the server is not willing to interpret a client’s long URI
415 Unsupported Media Type Request rejected by the server, as the requested media format of requested data is not supported by the server
416 Range Not Satisfiable Range specified on the header cannot be completed. The range may be outside the size of the target URI’s data
417 Expectation Failed Response code used to indicate that the “Expect” header field cannot be met by the server
418 I'm a teapot Learn More - Used when the server refuses to brew coffee with a teapot
421 Misdirected Request Used when the request is sent to a server that cannot produce a response. Can also be sent by servers not configured to send responses
425 Too Early Used when the server is unwilling to process a possible duplicate request
428 Precondition Required The server requires a conditional request that is not met by the user-agent
429 Too Many Requests Learn More - The client has sent too many requests in a given timeframe, and has been temporarily blocked by the server
431 Request Header Fields Too Large The server refuses to process the request because the headers are too large. If headers are reduced in size, the request may be accepted by the server
451 Unavailable For Legal Reasons The resource cannot be legally provided by the server per the servers configuration

Advertisement

TinkerAd

CServer Error Responses (500 - 599)

Code Meaning Description
500 Internal Server Error Learn More - The server encountered an unknown error.
501 Not Implemented The server does not support the request method used. Only GET and HEAD methods are required for servers to support
502 Bad Gateway This response means that the server, while trying to get a response from a different server or gateway, encountered an error
503 Service Unavailable Learn More - This response means that the server is not ready to handle requests. The server may be down for maintenance, or it may be overloaded
504 Gateway Timeout Similar to “502 Bad Gateway”, except the server is unable to set a request in the timeframe provided
505 HTTP Version Not Supported The HTTP version used in the request is not supported by the server
506 Variant Also Negotiates An internal error has occurred pertaining to the negotiation of resources
508 Loop Detected The server detected an endless loop during processing and aborted the request
510 Not Extended Additional extensions are required for the server to process the request
511 Network Authorization Required This response means that the client must authenticate to gain acess to the server network

Conclusion

That's it! Check out the Response Codes FAQ to learn more about the most popular error codes. If we messed up (After all, we are humans), please let us know!

Advertisement

Article by Tinkerman