Understanding of HTTP Response Code

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HTTP status code is very much important in the restful webservice and we should use appropriate status code from the server. HTTP provides response codes to inform clients of the status of their request. Use them carefully!
Don’t return a 200 response code every time , even in case of an error, it means, don’t use 200 Ok , if something is wrong.

These are the Series status code as:

  • 1XX: for Informational
  • 2XX: for Success
  • 3XX: for redirection
  • 4XX: for Client side error code
  • 5XX: for Server side error code

I tried to brief with one or two error code for each section, with example

2xx – Success codes

  • 200 – OK, this should be used when all goes well , it means if request executed successfully without any exception.
  • 201 – Created, this should be used when a new resource has been created. Location header contains the address of the new resource.
  • 202 – Accepted, a clients request is pending and will be completed later. Location header contains the expected address of the new resource, so it can be checked later.

3xx – Redirection codes

  • 301 – Moved Permanently, the API has moved a resource in response to the request, or an old resource is requested. Location cont
    ains the new URI.
  • 302 – Moved temporarily.
  • 304 – Not Modified, the client already has this data, used when the client provided a If-Modified-Since header and the data hasn’t been modified. Date header is required, ETag and Content-Location should be same as a 200, Expires, Cache-Control and Vary are required if they’ve changed since last sent.

4xx – Client side error

  • 400 – Bad Request, there is a client-side problem, the document in the entity-body should contain more info on the problem
  • 401 – Unauthorized, wrong credentials provided, or no credentials provided, resource is not authorize to access.
  • 404 – Not Found, no resource matches the requested URI, there is no reference to it on the server.

5xx – Server side error

  • 500 – Internal Server Error, there is an error on the server



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