--- title: Status codes description: Analyze HTTP status code distribution per data center. image: https://developers.cloudflare.com/core-services-preview.png --- > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/analytics/llms.txt > Use this file to discover all available pages before exploring further. [Skip to content](#%5Ftop) # Status codes Note Status Codes analytics by data center is exclusive to the [enterprise level of service ↗](https://www.cloudflare.com/plans/enterprise/contact/). Status Codes metrics in the Cloudflare dashboard **Analytics** app provide customers with a deeper insight into the distribution of errors that are occurring on their website per data center. A data center facility is where Cloudflare runs its servers that make up our edge network ([current locations ↗](https://www.cloudflare.com/network/)). HTTP status codes that appear in a response passing through our edge are displayed in analytics. The `Origin Status Code` can help you investigate issues on your origin. If your origin returns a `5xx` error, Cloudflare's edge will forward this error to the end user. Comparing the `Edge Status Code` and `Origin Status Code` can help determine whether the issue is occurring on your origin or on the Cloudflare edge. Errors that originate from our edge servers (blank `502`, `503`, or `504` error page with just `Cloudflare`) are not reported as part of the error analytics. You can filter out specific error(s) by selecting one or more in the legend. You can also exclude a particular error and it will no longer display as part of the graph. Note Users may also see `100x` errors which are not reported. These will be displayed as either `403` or `409` (edge) errors. ![Error analytics by Cloudflare data center](https://developers.cloudflare.com/_astro/status-codes.BbTZPg-P_ZDqqiT.webp) --- ## Common edge status codes * `400` \- Bad Request intercepted at the Cloudflare Edge (for example, missing or bad HTTP header) * `403` \- Security functionality (for example, Web Application Firewall, Browser Integrity Check, [Cloudflare challenges](https://developers.cloudflare.com/cloudflare-challenges/), and most 1xxx error codes) * `409` \- DNS errors typically in the form of 1000 or 1001 error code * `413` \- File size upload exceeded the maximum size allowed (configured in the dashboard under **Network** \> **Maximum Upload Size**.) * `444` \- Used by Nginx to indicate that the server has returned no information to the client, and closed the connection. This error code is internal to Nginx and is **not** returned to the client. * `499` \- Used by Nginx to indicate when a connection has been closed by the client while the server is still processing its request, making the server unable to send a status code back. For more information, refer to [4xx Client Error](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/). --- ## Common origin status codes * `400` \- Origin rejected the request due to bad, or unsupported syntax sent by the application. * `404` \- Only if the origin triggered a 404 response for a request. * `4xx` * `50x` For more information, refer to [4xx Client Error](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/) and [Troubleshooting Cloudflare 5XX errors](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/). --- ## 52x errors * `520` \- This is essentially a "catch-all" response for when the origin server returns something unexpected, or something that is not tolerated/cannot be interpreted by our edge (that is, protocol violation or empty response). * `522` \- Our edge could not establish a TCP connection to the origin server. * `523` \- Origin server is unreachable (for example, the origin IP changed but DNS was not updated, or due to network issues between our edge and the origin). * `524` \- Our edge established a TCP connection, but the origin did not reply with a HTTP response before the connection timed out. * `525` \- This error indicates that the SSL handshake between Cloudflare and the origin web server failed, either due to a network issue or a certificate issue at the origin. * `526` \- The certificate configured at the origin is not valid. For more information, refer to [Troubleshooting Cloudflare 5XX errors](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/). ```json {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/analytics/","name":"Analytics"}},{"@type":"ListItem","position":3,"item":{"@id":"/analytics/account-and-zone-analytics/","name":"Account and zone analytics"}},{"@type":"ListItem","position":4,"item":{"@id":"/analytics/account-and-zone-analytics/status-codes/","name":"Status codes"}}]} ```