This visualization shows the response time of a single HTTP POST request sent via `curl` to a test endpoint. A time series line chart plots the server’s response latency in milliseconds, with the x-axis representing sequential request attempts and the y-axis showing duration. The code uses `d3.json` to fetch the endpoint, then builds the chart with `d3.scaleTime`, `d3.axisBottom`, and `d3.line`. The data comes from the server’s JSON response, which contains timestamped latency values. The rendering relies on standard SVG elements generated through D3’s selection and join methods, with a hover tooltip provided by `d3.tip`.