Function start

wasm/web_request.js:196–209

(controller)

            return new Response(
                new ReadableStream({
                    async start(controller) {
                        const reader = response.body.getReader();
                        for (; ;) {
                            const { done, value } = await reader.read();
                            if (done) {
                                break;
                            }
                            loaded += value.byteLength;
                            var v = loaded / total;
                            Module.ccall('emsCallDownloadCallback', 'number', ['number', 'number'], [v, ctxId]);
                            controller.enqueue(value);
                        }
                        controller.close();
                    }
                })
            );
        })