4xx Client Error
4xx codes are error responses that indicate an issue on the client's end, potentially due to a network problem.
4xxcodes 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
HEADrequest. - Custom rules can return any response code in the range of
400–499on 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.
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 filtering for specific Ray ID, which can be useful to investigate HTTP Errors.
For a complete description of this error refer to the Error 400 page.