--- title: 4xx Client Error description: Troubleshoot 4xx client error HTTP status codes. image: https://developers.cloudflare.com/core-services-preview.png --- > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/support/llms.txt > Use this file to discover all available pages before exploring further. [Skip to content](#%5Ftop) # 4xx Client Error `4xx` codes are error responses that indicate an issue on the client's end, potentially due to a network problem. * `4xx` codes can be used as a response to any request method. * The origin server should include an explanation, which should be displayed by the User-Agent, except in the case of a `HEAD` request. * [Custom rules](https://developers.cloudflare.com/waf/custom-rules/) can return any response code in the range of `400–499` on your HTML page if the site owner has created a rule with the _Block_ action and configured a custom response code. For more details, refer to [custom response](https://developers.cloudflare.com/waf/custom-rules/create-dashboard/#configure-a-custom-response-for-blocked-requests). ## Log Explorer [Log Explorer](https://developers.cloudflare.com/log-explorer/) provides access to Cloudflare logs with all the context available within the Cloudflare platform. You can monitor security and performance issues with custom dashboards or investigate and troubleshoot issues with log search. Log explorer [allows you to build queries](https://developers.cloudflare.com/log-explorer/log-search/) filtering for a specific [Ray ID](https://developers.cloudflare.com/fundamentals/reference/cloudflare-ray-id/), which can be useful to investigate HTTP Errors. ## 400 Bad Request For a complete description of this error refer to the [Error 400](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-400/) page. ## 401 Unauthorized For a complete description of this error refer to the [Error 401](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-401/) page. ## 402 Payment Required The `402 Payment Required` status code is reserved for future use and is not yet implemented according to the standards outlined in [RFC 7231 ↗](https://tools.ietf.org/html/rfc7231). ## 403 Forbidden For a complete description of this error refer to the [Error 403](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-403/) page. ## 404 Not Found For a complete description of this error refer to the [Error 404](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-404/) page. ## 405 Method Not Allowed For a complete description of this error refer to the [Error 405](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-405/) page. ## 406 Not Acceptable For a complete description of this error refer to the [Error 406](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-406/) page. ## 407 Authentication Required For a complete description of this error refer to the [Error 407](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-407/) page. ## 408 Request Timeout For a complete description of this error refer to the [Error 408](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-408/) page. ## 409 Conflict For a complete description of this error refer to the [Error 409](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-409/) page. ## 410 Gone For a complete description of this error refer to the [Error 410](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-410/) page. ## 411 Length Required For a complete description of this error refer to the [Error 411](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-411/) page. ## 412 Precondition Failed For a complete description of this error refer to the [Error 412](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-412/) page. ## 413 Payload Too Large For a complete description of this error refer to the [Error 413](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-413/) page. ## 414 URI Too Long For a complete description of this error refer to the [Error 414](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-414/) page. ## 415 Unsupported Media Type For a complete description of this error refer to the [Error 415](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-415/) page. ## 416 Range Not Satisfiable For a complete description of this error refer to the [Error 416](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-416/) page. ## 417 Expectation Failed For a complete description of this error refer to the [Error 417](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-417/) page. ## 429 Too Many Requests For a complete description of this error refer to the [Error 429](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-429/) page. ## 451 Unavailable For Legal Reason For a complete description of this error refer to the [Error 451](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-451/) page. ## 499 Client Close Request For a complete description of this error refer to the [Error 499](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-499/) page. ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/#page","headline":"4xx Client Error · Cloudflare Support docs","description":"Troubleshoot 4xx client error HTTP status codes.","url":"https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/","inLanguage":"en","image":"https://developers.cloudflare.com/core-services-preview.png","dateModified":"2026-06-05","publisher":{"@type":"Organization","name":"Cloudflare","url":"https://www.cloudflare.com/"},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/support/","name":"Support"}},{"@type":"ListItem","position":3,"item":{"@id":"/support/troubleshooting/","name":"Troubleshooting"}},{"@type":"ListItem","position":4,"item":{"@id":"/support/troubleshooting/http-status-codes/","name":"HTTP Status Codes"}},{"@type":"ListItem","position":5,"item":{"@id":"/support/troubleshooting/http-status-codes/4xx-client-error/","name":"4xx Client Error"}}]} ```