Replit
realtime
Replit WebSocket Proxy Disconnecting
Your real-time features (chat, live updates, notifications) stop working after a few minutes because WebSocket connections are silently dropped. Users see stale data and must refresh the page to get updates again.
Replit routes WebSocket traffic through a reverse proxy that has idle connection timeouts. If no data is sent over the WebSocket for a period of time, the proxy closes the connection. Your app has no reconnection logic, so the connection stays dead until the user refreshes.
This is especially problematic for apps that use WebSockets for occasional updates (like notifications) rather than constant data streams. The connection sits idle between updates and gets killed by the proxy.
Error Messages You Might See
WebSocket connection to 'wss://...' failed
WebSocket is already in CLOSING or CLOSED state
Error during WebSocket handshake: Unexpected response code: 502
Connection closed abnormally (code 1006)
Common Causes
- Proxy idle timeout — Replit's reverse proxy closes WebSocket connections that are idle for too long (typically 60 seconds)
- No ping/pong heartbeat — the app does not send periodic keep-alive messages to prevent timeout
- No reconnection logic — when the connection drops, the client does not attempt to reconnect
- Container sleep — Replit free tier containers sleep after inactivity, killing all connections
- SSL/TLS handshake issues — WebSocket upgrade fails intermittently through the HTTPS proxy
How to Fix It
- Implement ping/pong heartbeat — send a ping message every 30 seconds from the server and respond with pong from the client
- Add client-side reconnection — detect disconnection and automatically reconnect with exponential backoff
- Use a WebSocket library with built-in reconnection — libraries like socket.io or reconnecting-websocket handle this automatically
- Handle connection state in UI — show a "reconnecting" indicator when the WebSocket is disconnected
- Use wss:// not ws:// — Replit requires secure WebSocket connections since it serves over HTTPS
Real developers can help you.
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
Jaime Orts-Caroff
I'm a Senior Android developer, open to work in various fields
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
zipking
I am a technologist and product builder dedicated to creating high-impact solutions at the intersection of AI and specialized markets. Currently, I am focused on PropScan (EstateGuard), an AI-driven SaaS platform tailored for the Japanese real estate industry, and exploring the potential of Archify.
As an INFJ-T, I approach development with a "systems-thinking" mindset—balancing technical precision with a deep understanding of user needs. I particularly enjoy the challenge of architecting Vertical AI SaaS and optimizing Small Language Models (SLMs) to solve specific, real-world business problems. Whether I'm in a CTO-level leadership role or hands-on with the code, I thrive on building tools that turn complex data into actionable value.
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Alvin Voo
I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing.
My expertise lies in the critical backend infrastructure: the parts that must be fast, secure, and scalable. I thrive on high-pressure environments, such as when I had only three weeks to architect and launch an Ethereum redemption system with minimal prior crypto knowledge, turning it into a major revenue stream.
What I bring to your project:
Forensic Debugging: I don't just "patch" bugs; I use tools like Datadog and Explain Analyzers to map out bottlenecks and resolve root causes—like significantly reducing memory usage by optimizing complex DB joins.
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Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Meïr Ankri
Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews.
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Get HelpFrequently Asked Questions
How often should I send heartbeat pings?
Every 25-30 seconds is a safe interval. This keeps the connection alive through most proxy timeout configurations without creating excessive traffic.
Should I use WebSocket or socket.io on Replit?
socket.io is recommended because it includes automatic reconnection, heartbeats, and fallback to HTTP long-polling when WebSockets are unavailable.
Do WebSockets work on Replit free tier?
Yes, but the free tier containers sleep after inactivity. When the container sleeps, all WebSocket connections are dropped. Paid deployments stay active.