---
title: 4xx Client Error · Cloudflare Support docs
description: 4xx codes are error responses that indicate an issue on the
  client's end, potentially due to a network problem.
lastUpdated: 2025-11-06T12:25:45.000Z
chatbotDeprioritize: false
source_url:
  html: https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/
  md: https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/index.md
---

`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 to build queries](https://developers.cloudflare.com/log-explorer/log-search/) filtering for 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.
