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    WebSocket Integration Debugger

    1

    Systematic debugger for WebSocket handshakes, event flows, and reconnection logic across all major frameworks.

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    WebSocket Integration Debugger

    WebSocket Integration Debugger

    Example session with this skill installed

    My React app uses Socket.IO. It connects fine locally but fails on the staging server with a 400 Bad Request during the handshake. Here are the headers from the failed request.

    • Read your context and instructions
    • Compiled the websocket integration debugger

    I have analyzed the handshake headers and server environment. The 400 Bad Request during the Socket.IO upgrade is caused by a mismatch between the client's transport requirements and the staging load balancer's configuration. ## WebSocket Diagnostic Report ### Debugging Summary - **Connection status**: Failed (Handshake) - **Primary suspected issue**: Sticky session / Proxy incompatibility - **Confidence**: Strongly indicated - **User-visible symptom**: Infinite connection retries with 400 errors - **Highest-priority next step**: Enable session affinity on the load balancer ### Connection & Handshake Audit | Layer | Observation | Status | Evidence | Recommendation | |---|---|---|---|---| | Transport | wss://staging.api.io | OK | Valid TLS cert | No change | | Handshake | HTTP 400 | FAIL | `sid` mismatch | Check sticky sessions | | Headers | `Upgrade: websocket` | OK | Header present | N/A | | Gateway | Nginx/ALB | WARN | No session affinity | Enable ip_hash or cookie-based affinity | ### Root-Cause Findings **Issue 1 — Missing Session Affinity** - **Severity**: Blocker - **Confidence**: High - **Evidence**: Socket.IO requires the initial HTTP handshake and the subsequent WebSocket upgrade to hit the same server instance. The logs show the SID generated by Instance A is being sent to Instance B. - **Root Cause**: The staging load balancer is using round-robin distribution without sticky sessions. - **Fix**: Configure your load balancer (e.g., AWS ALB or Nginx) to use sticky sessions (session affinity). - **Validation Test**: Attempt a connection and verify the `Set-Cookie` header is respected in subsequent polling requests. - **Regression Risk**: Low; may slightly unevenly distribute load across pods. ### Reconnection & Lifecycle Plan The client is currently stuck in an aggressive retry loop. Once affinity is fixed, ensure the client uses exponential backoff to avoid hammering the gateway during deployment restarts. **Next steps** 1. Update your Nginx or ALB configuration to enable sticky sessions. 2. Verify that the client is not forcing `transports: ['websocket']` if the server expects a polling upgrade first. 3. Check server-side logs for "Unknown transport" or "Session ID unknown" errors to confirm the fix.

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    About this skill

    The problem

    Debugging real-time communication is notoriously difficult because state is transient and failures often happen silently during handshakes or reconnection loops. Developers frequently waste hours chasing race conditions, heartbeat failures, or protocol mismatches across the transport layer.

    What it does

    • Performs a systematic audit of the connection lifecycle from initial TCP handshake to application-level heartbeat.
    • Analyzes WebSocket frames and HTTP upgrade headers to identify proxy, TLS, or CORS misconfigurations.
    • Maps event-flow timelines to detect out-of-order subscriptions, duplicate listeners, and race conditions.
    • Validates JSON schemas and binary payloads against client-server contracts to find serialization errors.
    • Generates structured reconnection strategies including backoff logic and state restoration plans.

    Frameworks & tools

    Browser WebSocket API, Node.js (ws), Socket.IO, React, Next.js, Vue, Go, Python, and Java.

    Why this beats prompting it yourself

    General LLMs often overlook the nuance between raw WebSockets and abstraction layers like Socket.IO, leading to incorrect advice on headers or event names. This skill enforces a transport-upward debugging methodology that prevents you from fixing application logic when the root cause is actually a proxy timeout or a failed protocol upgrade.

    Use cases

    • Diagnosing why connections drop exactly 60 seconds after a successful handshake.
    • Fixing "403 Forbidden" or "101 Switching Protocols" failures in production environments.
    • Auditing complex event-driven state sync in React or Vue applications.
    • Designing resilient reconnection logic for unstable mobile network environments.

    Known limitations

    Requires logs or observed frame data to provide definitive root causes. Does not support bypass of authentication or security protocols.

    Requires user-provided logs or frame traces for high-confidence diagnosis. Scope is limited to protocol and integration logic, not network-level packet sniffing.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before any payment.

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    Listed1 month ago

    What's inside

    Frequently Asked Questions

    This skill identifies issues like failed protocol upgrades, proxy timeouts, race conditions in event flows, and serialization errors by auditing the entire connection lifecycle from TCP handshake to heartbeat.

    It is compatible with all major frameworks including Socket.IO, Node.js (ws), the Browser API, and backend implementations in Go, Python, and Java.

    Simply provide the skill with your connection logs, frame data, or a description of the failure state (such as specific error codes like 1006 or 403) to begin the diagnostic process.

    Yes, the debugger analyzes your current failure patterns to generate optimized backoff logic and state restoration plans specifically tailored for unstable network environments.

    Your purchase includes lifetime access to the WebSocket Integration Debugger skill, including all future updates and methodology refinements as new protocol standards emerge.

    No, this tool is a diagnostic assistant for developers; it helps identify security misconfigurations like CORS or TLS issues but cannot bypass authentication or security protocols.

    New in Testing & Debugging