• Jeremy

    Good guide. A couple of other important status codes are 503 and 304.

    503 – For planned site downtime and maintenence, return this code to signal that your site is temporarily down. This will prevent Google from indexing your maintenance pages and let them know it’s temporary.

    304 – Good for large sites. If the content has not been changed since the last time that a search bot has visited, serve this response code and they will not download the page content again. Across a site with millions of pages, this can be handy.