This interactive Sankey diagram visualizes HTTP request flows within a Swagger-defined Petstore API, using D3.js v3 and a custom `d3.sankey()` layout. Nodes represent endpoints, HTTP methods, response codes, and resource parameters, with link widths proportional to the request values (3.0 or 0.4). Users can drag nodes to rearrange the flow, and hovering highlights connections. The SVG rendering includes draggable rectangles for nodes and curved paths for links, with data sourced from multiple JSON files including `fullcoggle.json` and `petswagger.json`.