--- description: Analyze HTTP status code distribution per data center. title: Status codes image: https://developers.cloudflare.com/analytics/account-and-zone-analytics/status-codes/og.png?v=ec5f8027bbabadf9 --- [Skip to content](#main-content) > 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. # Status codes Last updated May 6, 2026|Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/analytics/account-and-zone-analytics/status-codes/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/) 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/cdn-cgi/image/onerror=redirect,width=1458,height=940,format=webp/_astro/status-codes.BbTZPg-P.png) --- ## 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/). Was this helpful? YesNo ## On this page [![](https://developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/analytics/account-and-zone-analytics/status-codes/#page","headline":"Status codes","description":"Analyze HTTP status code distribution per data center.","url":"https://developers.cloudflare.com/analytics/account-and-zone-analytics/status-codes/","inLanguage":"en","image":"https://developers.cloudflare.com/analytics/account-and-zone-analytics/status-codes/og.png?v=ec5f8027bbabadf9","dateModified":"2026-05-06","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. 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