How I coded an SSE streaming AI Copilot & 3D canvas entirely from my smartphone during factory line shifts

Hey everyone,

I’m a completely self-taught independent developer. For the past few months, I’ve been coding CoSpatial 3D (https://cospatial3d.xyz)—a mobile-optimized spatial studio and generative concept engine—entirely from my smartphone during my 15-minute breaks and lunch hours while working intensive manual labor shifts on a production line.

I finally got our production deployment stable over our custom domain, but as an amateur coder, the biggest technical roadblock I hit was UI throttling. Whenever I asked our in-app AI Copilot to fix complex 3D math scripts or rewrite long files, the backend server would hit default HTTP timeout limits, buffer, and completely crash the mobile browser window.

To fix this before launch so other self-taught builders can bypass roadblocks smoothly, I ripped out the standard request-response loops and hardcoded Server-Sent Events (SSE) streaming on my Python backend, using this fetch reader loop on my React frontend to consume the chunks token-by-token:

const handleFetchStream = async (prompt) => {