gradio.Server is a new Gradio class that extends FastAPI, allowing developers to pair any custom frontend (React, Svelte, plain HTML/JS) with Gradio's backend infrastructure including queuing, concurrency management, ZeroGPU support, and gradio_client compatibility. The @app.api() decorator wraps Python functions with Gradio's queuing engine, preventing GPU contention when multiple users hit an endpoint simultaneously. A working demo builds a 'Text Behind Image' editor: a ~50-line Python backend loads a BiRefNet segmentation model, while a 1300-line vanilla HTML/CSS/JS frontend handles canvas layering, drag-and-drop, and client-side PNG export. The frontend communicates via the Gradio JS Client to benefit from queue management. Future posts will cover MCP tool registration, SSE streaming, batch processing, and multi-page app patterns.
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