Building a real-time streaming task manager with Parallel
Blog post from Parallel Web Systems
The guide details the creation of a task streaming playground utilizing Parallel's Task API with real-time Server-Sent Events (SSE), aiming to assist developers in building applications that create, execute, and monitor tasks with real-time progress streaming. The architecture involves OAuth2 authentication with PKCE for security, a comprehensive task creation form, and persistent storage for task history management. The guide emphasizes a stateless streaming design where the Parallel Task API's SSE endpoint provides complete current state information, eliminating the need for backend state maintenance. It explains the manual implementation of SSE using the Fetch API and ReadableStreams due to the inability of the browser's EventSource API to set custom headers required by Parallel's API. The task execution is resilient, with auto-reconnection logic and event visualization in the UI, allowing users to track progress through a rich event taxonomy. The CORS proxy worker addresses same-origin policy challenges, enabling browser access to external APIs by transparently forwarding requests and adding necessary headers. The implementation also covers dynamic OAuth client registration and the secure token exchange process, ensuring enterprise-grade security without pre-registering OAuth clients.
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