How to Decipher HTTP Response Codes

Below are a list of some of the most common HTTP codes.  These status codes are generally visible in either the access log, or the error log. Check your web server’s documentation for details about where to find those logs.

HTTP Codes – 200 Ok – Standard response for successful HTTP requests. The information returned with the response is dependent on the method used in the request, for example:

• GET an entity corresponding to the requested resource is sent in the response
• HEAD  the entity-header fields corresponding to the requested resource are sent in the response without any message-body
• POST  an entity describing or containing the result of the action
• TRACE  an entity containing the request message as received by the end server.

HTTP Codes – 301 Moved Permanently – This and all future requests should be directed to the new URL you are redirected to.

HTTP Codes – 401 Unauthorized – Authentication is possible and has failed or has not yet been provided.

HTTP Codes – 403 Forbidden – The request was legitimate but the server is configured not to respond to it.

HTTP Codes – 404 Not Found – The requested resource could not be found. This status code is commonly used when the server does not wish to reveal exactly why the request has been refused, or when no other response is applicable.

HTTP Codes – 500 Internal Server Error – A generic error message.  Generally, an indication of a script or configuration error.

HTTP Codes – 503 Service Unavailable – The server is currently unavailable.  503 is usually due to overloading or maintenance.

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