Common HTTP Status Codes

1XX (Informational Purpose)

• These response codes are used to send some provisional message to the client while the server is still processing the request.

1) 100 - Continue

This status code indicates that the server has received request headers and the client can continue to send request body.

2) 101 - Switching Protocols

This status code is sent when the server is switching protocols as requested by the client.

3) 102 - Processing

The server is taking time to process the request and updates the client to wait until the server processes the request without timing out the request.

2XX (Success)

• This set of status codes indicates that the request has been successfully received, understood, and accepted.

4) 200 - OK

This status code indicates that the request sent by the client is OK.

5) 201 - Created

It indicates that a new resource has been created as requested by the client.

6) 202 - Accepted

It indicates that the request has been accepted for processing but processing is not complete yet.

7) 203 - Non-Authoritative Information

It indicates that enclosing information is modified by the transforming proxy server from an original server.

8) 204 - No Content

This status code indicates that the request has been processed successfully and the response doesn’t contain any content.

3XX (Redirection)

• This category of HTTP status codes is related to URL redirection. These status codes indicate that the client needs to take additional action to complete the request.

9) 300 - Multiple Choices

It returns with multiple choices of links that a user can select and go to that location.

10) 301 - Moved Permanently

It indicates that the requested page has been moved permanently to the given URL.

11) 302 - Found

The requested page has been moved temporarily to a new URL.

12) 303 - See Other

The requested page can be found under another URL.

13) 304 - Not Modified

It indicates that the requested page has not been modified since the specified date.

14) 305 - Use Proxy

The requested page can be accessed only through the proxy and the address of that proxy is provided in the response.

15) 306 - No Longer Used

This status code is no longer used and it is reserved for now. Previously it was used to switch proxy.

16) 307 - Temporary Redirect

The requested page has been moved temporarily to a new URL and the user has to make a fresh request using the specified URL without changing the method type.

17) 308 - Moved Permanently

The requested page has been moved permanently to a new URL and the user has to make a fresh request using the specified URL without changing the method type.

4XX (Client Errors)

This category of HTTP status codes represents errors on the client side.

18) 400 - Bad Request

It is sent when a request syntax is wrong or request size is too large or invalid construction of the request message.

19) 401 - Unauthorized

It is sent when authorization is required and the user doesn’t provide them.

20) 402 - Payment Required

It is still not in use. It is reserved for future use but some developers use it when a payment is required for the service.

21) 403 - Forbidden

It is sent when a user doesn’t have permission to access the requested page.

22) 404 - Not Found

It is sent when a requested page or resource is not found.

23) 405 - Method Not Allowed

It is sent when a request method (GET or POST) is not allowed for a requested resource or page.

24) 406 - Not Acceptable

It is sent when the server is unable to generate content that is acceptable to the client.

25) 407 - Proxy Authentication Required

It is sent when an authentication of a proxy server is required.

26) 408 - Request Time Out

It occurs when a server is timed out waiting for the request.

27) 409 - Conflict

It is sent when a request is not processed because of a conflict. It happens when a requested resource is not in the expected state or serving the request will cause conflict in the requested resource.

28) 410 - Gone

It is sent when a requested page or resource is no longer available.

29) 411 - Length Required

It is sent when a request doesn’t specify a content-length parameter and it is required by the server.

30) 412 - Precondition Failed

It occurs when a server fails to meet the preconditions specified by the requester.

31) 413 - Payload Too Large

It is sent when a server is not able to process the request because it is too large. Previously it was called Request Entity Is Too Large.

32) 414 - URI Too Long

It is sent when a requested URL is too long to process.

33) 415 - Unsupported Media Type

It is sent when a client uploads an unsupported media type.

34) 429 - Too Many Requests

It occurs when a client sends too many requests in a specified period of time.

5XX (Server Errors)

This category of error codes represents server-side errors.

35) 500 - Internal Server Error

It occurs when a server meets with an unexpected condition.

36) 501 - Not Implemented

It indicates that a server doesn’t recognize the requested method or it is unable to process that type of request.

37) 502 - Bad Gateway

It happens when a server receives an invalid response from an upstream server.

38) 503 - Service Unavailable

It indicates that the server is temporarily down for maintenance or overloaded.

39) 504 - Gateway Timeout

It occurs when a server doesn’t receive a response on time from the upstream server.

40) 505 - HTTP Version Not Supported

It indicates that the server doesn’t support the HTTP protocol version used in the request.

41) 507 - Insufficient Storage

It indicates that the server doesn’t have sufficient storage to complete this request.

42) 511 - Network Authentication Required

The client needs to authenticate to gain network access.