Replit
ui
WebSocket Connection Failed on Replit
WebSocket connections fail with network errors or close immediately. Real-time features like chat or notifications don't work.
WebSocket configuration and deployment differences between local and Replit cause issues.
Error Messages You Might See
WebSocket connection to 'ws://...' failed
Could not upgrade to WebSocket
Error: Could not find message broker relay
Common Causes
- WebSocket endpoint not exposed or misconfigured
- CORS not allowing WebSocket upgrade requests
- Proxy/load balancer not forwarding WebSocket protocol
- Client using wrong WebSocket URL (ws instead of wss, or localhost)
- StompBroker not configured for Spring WebSocket
How to Fix It
For Spring WebSocket, use WebSocketConfigurer and registerStompEndpoints(). Enable CORS with allowed origins. Client should use 'wss://' (secure WebSocket) on Replit. Verify endpoint path matches client connection URL. Check browser console for actual error message and upgrade handshake details.
Real developers can help you.
Vlad Temian
15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox).
Cursor ambassador and agentic tooling builder.
I've scaled systems, automated deployments, and built observability tools for AI coding workflows. I specialize in taking vibe-coded apps from broken prototype to production-ready: fixing Supabase auth/RLS, Stripe integrations, deployment pipelines, and cleaning up AI-generated spaghetti.
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Matthew Butler
Systems Development Engineer @ Amazon Web Services
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Tejas Chokhawala
Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript.
Focused on performance, clean architecture and shipping fast.
Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools.
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
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Daniel Vázquez
Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting.
Matthew Jordan
I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job.
Jacek Rozanski
Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month.
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Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code.
Based in Poland (CET timezone). Available for async work and calls during EU/US business hours.
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.
Rudra Bhikadiya
I build and fix web apps across Next.js, Node.js, and DBs.
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Get HelpFrequently Asked Questions
Should I use ws:// or wss:// on Replit?
Use wss:// (secure) on production. Client auto-detects based on page protocol
How do I configure Spring WebSocket?
Implement WebSocketConfigurer, register endpoint with registerStompEndpoints()