About the Header Checker Tool
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Use the HTTP Response Code Checker tool to see which response code your web server is returning for a requested URL. This (header checker tool) can provide valuable information on the status of a requested URL. Simply type or paste the URL in the box below, and then click Ninja Check.
Note: There may be more than one response code returned by the HTTP header checker tool if the original URL is redirected to another URL.
The most commonly returned HTTP response codes include the following:
- 200: The page at the URL requested was successfully processed by the web server.
- 301: The URL requested has been permanently reassigned to another URL, and the page at that URL will be requested.
- 302: The URL requested has been temporarily reassigned to another URL, and the page at that URL will be requested.
- 404: The page at the URL requested couldn't be found on the web server.
- 503: The web server is temporarily unavailable and cannot process the URL request.
For a comprehensive list of the HTTP status response codes produced by a http response code checker and their definitions, explore the following links:
- The Internet Assigned Numbers Authority: HTTP Status Code Registry
- The World Wide Web Consortium: HTTP Status Code Definitions
- Google Help: HTTP status codes
- Microsoft IIS 7.0 HTTP status codes
Note: Using the correct type of URL redirect is very important for search engine optimization (SEO) purposes. Therefore, the use of a http header checker can often prove to be quite invaluable). For detailed information on using URL http response code checker redirects for SEO, see The Ultimate How-To Guide on 301 Redirects blog post.
HTTP Header Checker Response Code Key
100's Informational Responses
- 100 Trying: extended search being performed may take a significant time so a forking proxy must send a 100 Trying response
- 180 Ringing
- 181 Call Is Being Forwarded
- 182 Queued
- 183 Session Progress
200's Successful Responses
- 200 OK
- 202 accepted: It Indicates that the request has been understood but actually can't be processed
- 204 No Notification [RFC5839]
300's Redirection Responses
- 300 Multiple Choices
- 301 Moved Permanently
- 302 Moved Temporarily
- 305 Use Proxy
- 380 Alternative Service
400's Client Failure Responses
- 400 Bad Request
- 401 Unauthorized (Used only by registrars or user agents. Proxies should use proxy authorization 407)
- 402 Payment Required (Reserved for future use)
- 403 Forbidden
- 404 Not Found (User not found)
- 405 Method Not Allowed
- 406 Not Acceptable
- 407 Proxy Authentication Required
- 408 Request Timeout (Couldn't find the user in time)
- 409 Conflict
- 410 Gone (The user existed once, but is not available here any more.)
- 412 Conditional Request Failed
- 413 Request Entity Too Large
- 414 Request-URI Too Long
- 415 Unsupported Media Type
- 416 Unsupported URI Scheme
- 417 Unknown Resource-Priority
- 420 Bad Extension (Bad SIP Protocol Extension used, not understood by the server)
- 421 Extension Required
- 422 Session Interval Too Small
- 423 Interval Too Brief
- 424 Bad Location Information
- 428 Use Identity Header
- 429 Provide Referrer Identity
- 433 Anonymity Disallowed
- 436 Bad Identity-Info
- 437 Unsupported Certificate
- 438 Invalid Identity Header
- 480 Temporarily Unavailable
- 481 Call/Transaction Does Not Exist
- 482 Loop Detected
- 483 Too Many Hops
- 484 Address Incomplete
- 485 Ambiguous
- 486 Busy Here
- 487 Request Terminated
- 488 Not Acceptable Here
- 489 Bad Event
- 491 Request Pending
- 493 Undecipherable (Could not decrypt S/MIME body part)
- 494 Security Agreement Required
500's Server Failure Responses
- 500 Server Internal Error
- 501 Not Implemented: The SIP request method is not implemented here
- 502 Bad Gateway
- 503 Service Unavailable
- 504 Server Time-out
- 505 Version Not Supported: The server does not support this version of the SIP protocol
- 513 Message Too Large
- 580 Precondition Failure
600's Global Failure Responses
- 600 Busy Everywhere
- 603 Decline
- 604 Does Not Exist Anywhere
- 606 Not Acceptable
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