HTTP Header Checker: peeking at the conversation behind the scenes
Before a page appears in the browser, there is a brief exchange of messages between the browser and the server that ordinary visitors never see. Those messages are called HTTP headers, and they are rich with information: status code, server type, caching rules, and whether the site has proper protections in place. For anyone serious about running a website, reading headers is a basic skill.
I often use a header check as the first step when something feels off. Page slow? Look at the cache headers. Redirects going in circles? The Location header reveals it all. Old content sticking around even after an update? Almost certainly a caching issue that shows up right here.
Status codes worth knowing
- 200 means all is well, the page loaded successfully.
- 301 and 302 are redirects. 301 permanent, 302 temporary. The wrong choice can mess up SEO.
- 404 page not found. Fine occasionally, but a lot of them means broken links.
- 500 server error. This is a red light that needs immediate attention.
The redirect chain that quietly slows you down
This tool shows every redirect hop in order. You might be surprised to see one URL actually jump three times before reaching its destination: from http to https, then non-www to www, then to the final page. Each hop adds delay. Ideally tidy it up so it is a single hop straight to the final target.
Security headers, the shield often forgotten
This section shows whether important security headers are in place. Strict-Transport-Security forces the browser to always use HTTPS. X-Content-Type-Options stops the browser from guessing file types wrong. Content-Security-Policy limits which scripts are allowed to run. Many sites forget to set them, even though these three alone close most common gaps. Think of them as invisible extra locks whose value you feel the moment someone tries something funny.