What HTTP Status Codes Should Programmers be Concerned With?

Question

So, if you look at the List of HTTP Status Codes, there are probably a number of them that would be useful while programming. The server might handle some things, like protocols

Answer 1

The ones I've used most are:

• 301 - Moved Permanently - Use this if the resource is permanently moved to the new url.
• 302 - Moved Temporarily - Use this for redirecting when you can't have a permanent redirect.
• 404 - Not Found. Your server should be configured to serve this for invalid urls. You should monitor these in your logs--too many 404s is a sign of a bad push.
• 500 - Internal Server Error. Your server should be configured to properly send these when there are errors. You should monitor 5xx errors in your logs.