About

This Website Status Checker is a diagnostic utility designed to verify the reachability and responsiveness of web servers from an external perspective. Unlike internal monitoring tools, this client-side application simulates a user visit to determine if a website is globally accessible or if the issue is localized to your specific network.

The tool measures the RTT (Round Trip Time) or Latency, defined as the time duration t elapsed between the request transmission t_tx and the reception of the first byte t_rx, such that RTT = t_rx − t_tx. Additionally, it inspects HTTP Status Codes (e.g., 200 OK, 404 Not Found, 503 Service Unavailable) to diagnose the precise nature of the failure.

Advanced features include a multi-node latency estimation model, automated screenshot capture via headless browser APIs, and browser-local storage for historical uptime tracking. This tool is essential for webmasters, SEO specialists, and general users attempting to distinguish between local ISP failures and server-side outages.

Formulas

The availability status is determined by the HTTP response code C returned by the server. The latency L is measured in milliseconds.

{

UP if 200 ≤ C < 400DOWN if C ≥ 400 ∨ C = NULL

Network latency is estimated via a proxy request time delta:

L_est ≈ Δt_proxy + kd

Where k is the network congestion coefficient and d is the geographic distance factor.

Reference Data

Code	Classification	Description	Impact on SEO
200	SUCCESS	The request succeeded. The browser received the expected content.	Positive. Standard signal for indexed pages.
301	REDIRECT	Moved Permanently. The URL has changed definitively.	Transfers link equity to the new URL.
302	REDIRECT	Found (Temporary Redirect). The URL is temporarily at a different URI.	Does not update the index permanently.
403	CLIENT ERR	Forbidden. The server understands the request but refuses it.	Page dropped from index if persistent.
404	CLIENT ERR	Not Found. The server cannot find the requested resource.	High bounce rates; removed from index eventually.
500	SERVER ERR	Internal Server Error. Generic error message for server-side crashes.	Negative. Signals site instability.
502	SERVER ERR	Bad Gateway. Invalid response from an upstream server.	Negative. Common during traffic spikes.
503	SERVER ERR	Service Unavailable. Server is overloaded or down for maintenance.	Neutral if temporary; Negative if prolonged.
504	SERVER ERR	Gateway Timeout. The upstream server failed to send a request in time.	Negative. Indicates slow backend performance.

Frequently Asked Questions

This is likely a False Negative caused by Firewall or Anti-Bot protection (e.g., Cloudflare) blocking the automated check request. Alternatively, the site may be accessible from your local cache or region, but blocked globally.

Optimal server response time (TTFB) is under 200ms. 200ms to 500ms is acceptable. Anything over 500ms is considered slow and may negatively impact Google Core Web Vitals and user experience.

It means one server on the internet received an invalid response from another server. Often caused by an overloaded backend server (PHP/Python worker) or a misconfigured reverse proxy (Nginx/Apache).

Yes, the primary check is initiated from your browser (Client-Side) using CORS proxies to simulate external access. This helps determine if the issue is local to your machine or global.

The geographic data is an algorithmic estimation based on standard latency propagation delays relative to the primary proxy node. It provides a realistic approximation of global access speeds but is not a physical ping from that hardware.