This tool is very helpful for knowing the the server response to a petition, depending on the result, you'll be helping crawlers scans. Using cutop you'll get to know if you are doing it right.

HTTP posible values:

200 OK The request has succeeded.
It is the best message and what crawlers wish to find out.

301 Moved Permanently.
Redirection. It is better to don't use this kind of redirects.

302 Found The requested resource resides temporarily
Redirection. It is better to reduce the redirections.

307 Temporary Redirect.
Redirection. It is better to reduce the redirections.

404 Not Found The server.
The web page wasn't found. You should avoid this error.