HTTP status checker
Check any URL's HTTP status code, response time, redirects, and headers.
Enter a URL and we fetch it from our monitoring network and report the HTTP status code (200, 301, 404, 500, …), how long it took to respond, how many redirects it followed, and the server and content-type headers. It's the quickest way to confirm a page is reachable and returning the response you expect.
Frequently asked questions
What does the HTTP status code mean?
2xx means success, 3xx is a redirect, 4xx is a client error like 404 Not Found, and 5xx is a server error. A healthy page usually returns 200.
Why is the response time useful?
Slow responses often precede outages. If a page that normally answers in 100 ms suddenly takes seconds, something is wrong upstream.
What does a 403 vs 401 tell me?
401 means authentication is required or failed, while 403 means the server understood the request but refuses to authorize it. A 403 on a public page often points to a misconfigured firewall, WAF rule, or directory permission.
Why do I get a 200 in a browser but an error here?
Some servers serve different responses based on cookies, user-agent, or geography, and a few block automated clients outright. A 403 or 429 here while your browser works usually means a bot filter or rate limit is blocking our checker.
What's the difference between this and an uptime monitor?
This tool runs a single check on demand; SJ Monitor's HTTP uptime monitoring repeats the check on a schedule from our network and alerts you when the status code or response time crosses your threshold, with anti-flapping so one blip doesn't page you.
A 5xx error appeared once then cleared — should I worry?
An intermittent 5xx often signals an overloaded app server, a failing dependency, or a deploy in progress. One-off blips happen, but a recurring pattern is worth investigating before it becomes a sustained outage.
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