HTTP Headers Check

This tool will show you the header of a website page that the server sends out. With this tool, you can determine what kind of server the website is using, what server software they are using and what the status of the page is that your browser receives. You can also see if any cookies are being set by the page and what kind of page caching they have in place.

Some Standard Status Codes:

200 OK
Standard response for a page that was loaded successfully.

301 Moved Permanently
Tells the client that the page has moved and your request should redirect to the new url for all future requests.

403 Forbidden
The request was valid but the server is refusing your connection. You might not have premission to this page.

404 Not Found
The requested page was not found on the server.

500 Internal Server Error
Generic server error message.

More codes and their definitions can be found on the Wikipedia page.