Page Status Codes Report
The Page Status Codes report gives you insight into what pages did not load as expected on your site. These are pages that returned something other than 200-level codes from the server.
Tags are collected from all pages, including pages that return non-200 level status codes. If a page shows up in this report because it has been redirected (301), is forbidden (404) or otherwise inaccessible, tags are collected for the page and the pages are counted in the total number of pages scanned.
Common Status Codes
This class of status code indicates the client must take additional action to complete the request, such as reload a different page. Many of these status codes are used in URL redirection. A browser may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request. A browser should detect and intervene to prevent cyclical redirects.
4xx: Client Error
The 4xx class of status code is intended for situations in which the client seems to have erred. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents should display any included entity to the user.
5xx: Server Error
The server failed to fulfill an apparently valid request. Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents should display any included entity to the user. These response codes are applicable to any request method.
More information about server status codes can be found at the w3c site.
Clicking the bars in the chart will filter the report. The Selection Summary at the top reflects the filtered metrics. See Audit Overview for information about the Selection Summary.