check web redirect url status code checker

Check server response of

Server response
NS records
Whois domain
Response headers
Request headers
Raw HTML code
400 Bad Request - why9.com
HTTP Status: 400
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Cache-Control: private
Content-Type: text/html
Server: nginx2018
Set-Cookie: ASPSESSIONIDSASRASQS=KIGDOGACFFGAKFKIHHPBOPGG; path=/
X-Powered-By: ASP.NET
Date: Fri, 02 May 2025 14:38:39 GMT
Content-Length: 15

HTTP Code 400 Bad Request

400 http status code indicates that the server cannot process the request due to client error.

When is Code 400 used?

  • When the request is malformed or contains invalid parameters
  • When required data is missing in the request
  • When sending an incorrect JSON or XML payload

What does Code 400 mean for the user?

The user receives an error message indicating that their request is incorrect and needs to be fixed.

GET / HTTP/1.1
Host: why9.com
Accept: */*
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])

错误的请求

Whois info of domain