HTTP Return Code

When a HTTP Request is processed by a Web Application, a number of things can happen while processing the request. Depending on what happens, the Web Application will return a different HTTP Code.

• 200 means HTTP-OK, which indicates a happy flow when processing the request.
• The 300-range contains various redirect messages.
• Errors in the 400-range, 4XX, mean that the request was understood, but there was something wrong with the request. I.e., perhaps the resource that was identified by the URI did not exist (404), or the requester does not have permission to access the resource (403), or perhaps there were so many requests in too short a time that this request could not be processed (429).
• Errors in the 500-range, 5xx, mean that something went wrong while executing the request. I.e., it could be that a backend service that is required for processing the request is offline. (502).

See these pages for more information on a few specific return codes:

• HTTP-200
• HTTP-404
• HTTP-429