|900: QC Tool errors|
||Pseudo HTTP error
||Assigned by QC tools when an SSL (https) error is encountered. If the site works fine for you, clear the error and republish it.
|500: Server errors|
||HTTP Version Not Supported
||The server does not support the HTTP protocol version that was used in the request message. Should never happen with Robozilla; if it does, the server might be misconfigured.
||A server being used by this server has not responded in time.
||Service temporarily overloaded. The server cannot process the request due to a high load.
||The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request. Might be transient; hold for a few days and see if it clears up.
||Function not implemented in Web server software. Might occur when a site is moved to a different platform (operating system). Look for an updated URL.
||Sometimes happens due to a server misconfiguration. Usually this is transient, and goes away, but check first.
|400: Client errors
||The expectation given in an Expect request-header field could not be met by this server. Should never happen to Robozilla.
||Requested Range Not Satisfiable
||A browser which sends information on acceptable file size as part of its request, has requested a file that does not fit these parameters. Since Robozilla does not send this header, this shouldn't happen unless the server is misconfigured.
||Unsupported Media Type
||The server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method. Back up a few levels and see if there's an alternate version of the page you're looking for.
||Request-URI Too Large
||The URL (usually created by a GET form request) is too large for the server to handle. Check to see that a lot of garbage didn't somehow get pasted in after the URL.
||Request Entity Too Large
||The server is refusing to process a request because the request entity is larger than the server is willing or able to process. Should never occur for Robozilla.
||The precondition given in one or more of the request-header fields evaluated to false when it was tested on the server. Should never occur for Robozilla.
||The server requires a content-length in the request. Should never occur for Robozilla.
||The resource doesn't exist at all. The page was removed by the webmaster. This page should be deleted.
||The request could not be completed due to a conflict with the current state of the resource. Typically indicates defective programming of the Web server.
||The server took longer than expected to return a page, and timed out. Similar to -5, but generated by the server, rather than Robozilla.
||Proxy Authentication Required
||This code is similar to 401 (Unauthorised), but indicates that the client must first authenticate itself with the proxy. Since Robozilla doesn't use a proxy, this should never occur unless on a faulty server.
||The server cannot generate a response that the requester is willing to accept.
||Method Not Allowed
||Usually happens when a CGI script doesn't allow GET requests any longer. Backtrack the URL and see if you can find another way to show the data.
||The resource doesn't exist on this server. The page was probably removed.
||You can't see this resource on the server. The admin may have turned off the pages because of load or for some other reason.
||This resource cannot be accessed without payment.
||You can't see this resource on the server. Perhaps a password is now required, or the resource you're looking for has moved.
||Usually occurs due to a space in the URL or other malformed URL syntax. Try converting spaces to %20 and see if that fixes the error.
||The page has a new URL. Update the listing to the new URL.
||The page has a new URL temporarily (in theory; in practice, this is often used as a synonym for code 301). Check and update the listing to the new URL.
||The page has a new URL. Check and update the listing to the new URL.
||The page has moved to one of several possibilities. Pick the one that's closest to the original page, and update the URL.
|0/negative: Connection errors
||Probably a DNS error.
||Unable to Resolve Host
||Probably a typo in the host name or they didn't pay their bill for their Domain name.
||We can't connect to the HTTP server. The server is there but it didn't want to talk to Robozilla on the specified port.
||Robozilla connected OK, and sent the request but Robozilla timed out waiting to fetch the page. This happens sometimes on really busy servers.
||There was a problem with the format of the URL. Perhaps http:// is missing? Note: when you click on the  link for a URL missing http://, the edit page for the site comes up with http:// helpfully attached by the DMOZ software, and the URL link therefore works. You still have to click Update (not "This URL works for me") in order for the update to take effect.
||The server returned an unknown error code, and is probably misconfigured. The page may still show up okay, but it's a good idea to check it just in case.
||This code is assigned when an editor manually moves a listing to unreviewed as having an error. See the editor notes for more information on the reason.