The users may get an error while sending a request to a server. Definitely, the user has seen such messages frequently.
Here you can find the list of Hypertext Transfer Protocol (HTTP) response status codes. These codes are used to respond to the request of the client made to the server. There are 5 classes of HTTP response status codes. Let’s go through each class:
If you receive a response that is not included in this list, this means that it is a non-standard response, perhaps custom to the software of the server.
1xx: Information
Status code
Message
Description
100
Continue
Means that the server has received request headers and the client should continue to send request body.
101
Switching Protocols
Means that the client, who made a request, has asked the server to change protocols.
103
Checkpoint
Means that it is used in the resumable requests proposal to resume aborted PUT or POST requests.
2xx: Successful
Status code
Message
Description
200
OK
Means that the request is OK. It is standard response for successful HTTP requests.
201
Created
Means that the request has been fulfilled and a new resource is created.
202
Accepted
Means that the request has been accepted for processing, but the processing is going on.
203
Non-Authoritative Information
Means that the request has been successfully processed, but it is returning information which may be from another source.
204
No Content
Means that the request has been successfully processed, but it is not giving any content.
205
Reset Content
Means that the request has been processed, but it is not returning any content and it requires that the requester reset the document view.
206
Partial Content
Means that the server commits only a part of the resource, because of a range header, which was sent by the client.
3xx: Redirection
Status code
Message
Description
300
Multiple Choices
Is a link list which means that the user can select a link and go there. It can contain maximum five addresses.
301
Moved Permanently
Means that the page has been moved to a new URL.
302
Found
Means that the requested page has been moved to a new URL temporarily.
303
See Other
Means that the requested page can be found in another URL.
304
Not Modified
Means that the requested page hasn’t been modified since the last request.
306
Switch Proxy
Is not used anymore.
307
Temporary Redirect
Means that the requested page has been moved to a new URL temporarily.
308
Resume Incomplete
Is used in resumable requests proposal to continue aborted PUT or POST requests.
4xx: Client Error
Status code
Message
Description
400
Bad Request
Means that the request can be fulfilled because of the bad syntax.
401
Unauthorized
Means that the request was legal, but the server is rejecting to answer it. For the use when authentication is required and has failed or has not yet been provided.
402
Payment Required
Is reserved for a future use.
403
Forbidden
Means that the request is legal, but the server is rejecting to answer it.
404
Not Found
Means that the requested page cannot be found at the moment, but it may be available again in the future.
405
Method Not Allowed
Means that the request was made of a page that uses an unsupported request method for that page.
406
Not Acceptable
Means that the server can only generate an answer which the client doesn’t accept.
407
Proxy Authentication Required
Means that the client first authenticate itself with the proxy.
408
Request Timeout
Means that the server timed out waiting for the request.
409
Conflict
Means that the request cannot be completed, because of a conflict in the request.
410
Gone
Means that the requested page is not available anymore.
411
Length Required
Means that the content length is not defined and the server won’t accept the request without it.
412
Precondition Failed
Means that precondition, which is given in the request, is evaluated to false by the server.
413
Request Entity Too Large
Means that the request entity is too large and that’s why the server won’t accept the request.
414
Request-URI Too Long
Means that the URL is too long and that’s why the server won’t accept the request. It happens when you convert a POST request to a GET request with a long query information.
415
Unsupported Media Type
Means that the media type is not supported and that’s why the server won’t accept the request.
416
Requested Range Not Satisfiable
Means that the client asked for a part of the file but the server cannot supply that part.
417
Expectation Failed
Means that the server cannot meet the requirements of the expected request header field.
5xx: Server Error
Status code
Message
Description
500
Internal Server Error
Is a generic error and users receive this error message when there is no more suitable specific message.
501
Not Implemented
Means that the server doesn’t recognize the request method or it lacks the ability to fulfill the request.
502
Bad Gateway
Means that the server was acting as a gateway or proxy and it received an invalid answer from the upstream server.
503
Service Unavailable
Means that the server is not available now (It may be overloaded or down).
504
Gateway Timeout
Means that the server was acting as a gateway or proxy and it didn’t get answer on time from the upstream server.
505
HTTP Version Not Supported
Means that the HTTP protocol version, used in the request, is not supported by the server.
511
Network Authentication Required
Means that the client needs to authenticate to gain network access.
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