sourcecodestack Team
Tools, guides & how-tos
A site will not load. Before you clear your cache, reboot the router, or file an angry support ticket, answer one question: is the site down for everyone, or just for you? The answer changes everything you do next — and you can get it in under thirty seconds.
Your browser failing proves nothing by itself — the problem could be your DNS cache, your ISP, your VPN or the site itself. Run the URL through our Website Uptime Checker: it requests the site independently and reports the HTTP status code, response time and any redirect chain.
| Code | Meaning | Whose problem |
|---|---|---|
| 200 | Site responded fine | Yours (local/network) |
| 301/302 | Redirecting — follow the chain | Depends where it lands |
| 403 | Forbidden — blocked, geo-fenced or auth required | Mixed |
| 404 | Page does not exist (site itself is up) | The link |
| 429 | Too many requests — rate limited | Temporary |
| 500/502/503 | Server error / bad gateway / overloaded | The site’s |
| Timeout / DNS failure | Server unreachable or domain misconfigured | The site’s (usually) |
A redirect loop (endless 301s) and an expired TLS certificate are two classic “up but broken” states the checker also exposes — the server is technically running, but no browser will show the page.
ipconfig /flushdns · macOS: sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder. Stale DNS is the most common “just me” cause after a site migrates hosting.1.1.1.1 (Cloudflare) or 8.8.8.8 (Google) — ISP resolvers are often slow to pick up changes.If the site in question is yours, ad-hoc checks are not enough — you want to catch downtime before a visitor (or Googlebot) does. Repeated 5xx responses during crawls hurt search indexing, and downtime during an AdSense review is actively harmful. Use the Uptime Checker to batch-test your key URLs after every deployment, and see the website uptime monitoring guide for how status codes, redirects and TLS issues affect SEO. When an API endpoint (rather than a page) is misbehaving, test it directly with the online API client to see raw headers and response bodies.
Bottom line: one outside-in request answers “down or just me.” 5xx or timeout → their problem, wait it out. 200 → your problem, and the fix is almost always DNS, network or an overzealous extension.
sourcecodestack Team
We build free, privacy-first browser tools and write practical guides on how to use them. Everything runs on your device — no uploads, no sign-ups.
You have two JSON payloads — maybe a staging API response and a production one, or a config file before and af…
API Client Guide: Test APIs Online Without Postman Testing an API should be fast and frictionless. You have an…
QR codes have had several near death experiences since Denso Wave invented them in 1994. For over a decade the…