HTTPS / HTTP header checker URL status code & response key

14-day free trial
No credit card required

About our HTTPS & HTTP header checker

Opportunities to improve SEO are everywhere, even buried in URLs. We're not talking about what comes after the www but what's before it. Use our HTTP header checker to help further optimize SEO by checking server response and the status code of your URLs – because those codes an HTTP checker provides give you invaluable insight into the health of your site.

How to run an HTTPS/HTTP check with our status code checker

The process for using our page status checker couldn't be more straightforward. Painfully easy. After signing up for free access to all of our SEO tools, all you have to do is copy/paste or type the individual URL into our header checker tool and click “check header”. Job done. From there we'll check URL status in an instant and neatly present your URL status.

How to use the HTTP header checker

Common reasons to use our HTTP checker

200! 300! 400! 500! Going once, going twice…

Almost feels like an auction but those numbers represent critical information about your site and what's happening on it. Between all those levels there are dozens of codes, all of which are hidden from the end-user, unless there's something like the infamous 404 error that we've all seen, and live in the communication between browser (or client) and server.

An HTTP header checker tool makes that exchange visible but to understand the reasons for using one we mention below, you need to first understand headers themselves a bit more. In a nutshell, what happens when someone tries to access any pages on your site is that a host of HTTP requests get sent to a server and the server sends back responses, including the content. This happens in a fraction of a second with the HTTP header containing info that you can use to enhance your site's performance and therefore put yourself in better SEO standing.

The output from our response code checker – which search engine crawlers see – includes things like server software, type of content, length of content, etag, location, language and more. Working with these oft-overlooked parts of your site and telling servers how to cache your data makes a difference.

So, the main reason to use our HTTP response checker?

Improving technical SEO
Enhancing search engine's ability to index by resolving errors
Ensuring you've declared canonical pages
Bettering website performance

Response codes commonly returned by our header response checker

While there are a lot of different response codes our HTTPS status checker can spit out, there are just a handful that you're likely to see.

200: OK

Among the best codes to see, when an HTTP status check returns this it means the request was successful.

301: Moved Permanently

This check page status is letting you know that the page you requested has been permanently redirected and reassigned and that that page will be requested.

302: Found (aka temporary redirect)

The server header checker returning 302 is delivering a similar message to 301 with the difference being that the redirect is only temporary.

403: Forbidden

400-level codes from the headers checker are issues on the client-side, i.e., from your website’s side. When the HTTP header tool shows you 403 you know the request was sent and understood by the server but was refused. This is generally related to a permission issue.

404: Not Found

Arguably the most well-known, or only known, URL status checker error, 404 means the page is missing and the server just straight up can’t find what’s being requested.

500: Internal Server Error

All of the 500-level codes from our HTTP status code checker are related to server-side issues. 500 means there’s a general error with the internal server but, frustratingly, it doesn’t point to what that issue is.

503: Service Unavailable

a 503 error is telling you that the server is unavailable and just isn’t ready to take or process your request. This is a temporary issue that could be caused by something like server maintenance and is often resolved quickly.

Status code key to use with our HTTP header checker tool

While the above are the most common error codes, we've mentioned there are many more that are possible. Here's an exhaustive list of all the possible codes our HTTP checker may give you:

100's – Informational responses

  • 100: Continue
  • 101: Switching Protocols
  • 102: Processing
  • 103: Early Hints

200's – Successful responses

  • 200: OK
  • 201: Created
  • 202: Accepted
  • 203: Non-Authoritative Information
  • 204: No Content
  • 205: Reset Content
  • 206: Partial Content
  • 207: Multi-Status
  • 208: Already Reported
  • 226: IM Used

300's – Redirection responses

  • 300: Multiple Choices
  • 301: Moved Permanently
  • 302: Found
  • 303: See Other
  • 304: Not Modified
  • 305: Use Proxy
  • 307: Temporary Redirect
  • 308: Permanent Redirect

400's – Client/browser failure responses

  • 400: Bad Request
  • 401: Unauthorized
  • 402: Payment Required
  • 403: Forbidden
  • 404: Not Found
  • 405: Method Not Allowed
  • 406: Not Acceptable
  • 407: Proxy Authentication Required
  • 408: Request Timeout
  • 409: Conflict
  • 410: Gone
  • 411: Length Required
  • 412: Precondition Failed
  • 413: Payload Too Large
  • 414: URI Too Long
Show more

500's – Server failure responses

  • 500: Internal Server Error
  • 501: Not Implemented
  • 502: Bad Gateway
  • 503: Service Unavailable
  • 504: Gateway Timeout
  • 505: HTTP Version Not Supported
  • 506: Variant Also Negotiates
  • 507: Insufficient Storage
  • 508: Loop Detected
  • 509: Bandwidth Limit Exceeded
  • 510: Not Extended
  • 511: Network Authentication Required

Checkout our other SEO tools

XML sitemap generator

XML sitemap validator

HTTPS/HTTP header checker

Robots.txt generator

Redirect checker

UTM Builder