The Website Response Time Checker measures client-side HTTP round-trip latency from your local device to any public web endpoint in real time.

### How In-Browser Round-Trip Timing Works When you submit a URL (e.g., https://google.com), the tool initiates a browser fetch request configured with no-cors mode: - Request Timestamp: The client records the precise millisecond timestamp immediately before initiating the network request. - Network Fetch: The browser dispatches a standard TCP/TLS connection handshake and HTTP GET request to the target server. - Completion Timestamp: As soon as the initial response packet arrives back at your browser, the elapsed duration is calculated ($$\Delta t = t_{\text{end}} - t_{\text{start}}$$). - CORS and Header Visibility: Because cross-origin resource sharing (CORS) security policies restrict browsers from inspecting headers on third-party domains, the tool reports raw round-trip latency without exposing internal HTTP status codes.

### Worked Example - Target Host: https://google.com - Dispatch Time: $t_0 = 1200\text{ ms}$ - Resolution Time: $t_1 = 1264\text{ ms}$ - Measured Response Time: $64\text{ ms}$ - Reported Status: Fast Efficiency (Measured via non-blocking TCP round-trip)

### Honest Execution Note Unlike server-side ping utilities that run ICMP echo requests from data centers, this tool measures actual end-user response time from your physical location and network connection.