Fix: Nginx WebSocket Proxy Not Working (101 Switching Protocols Failed)
How to fix Nginx WebSocket proxying not working — 101 Switching Protocols fails, connections drop after 60 seconds, missing Upgrade headers, and SSL WebSocket configuration.
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Fix: Python threading Not Running in Parallel (GIL Limitations)
How to fix Python threading not achieving parallelism due to the GIL — when to use multiprocessing, concurrent.futures, or asyncio instead, and what the GIL actually blocks.
Fix: Python multiprocessing Not Working (freeze_support, Pickle Errors, Zombie Processes)
How to fix Python multiprocessing not working — freeze_support error on Windows, pickle errors with lambdas, zombie processes, and Pool hanging indefinitely.
Fix: React.memo Not Preventing Re-renders
How to fix React.memo not working — components still re-rendering despite being wrapped in memo, caused by new object/function references, missing useCallback, and incorrect comparison functions.
Fix: TypeScript Generic Type Constraint Errors
How to fix TypeScript generic constraint errors — Type 'X' does not satisfy the constraint 'Y', generic inference failures, constrained generics with extends, and conditional types.
Fix: CSS Grid Not Working (display: grid Has No Effect)
How to fix CSS Grid not working — grid-template-columns has no effect, grid items not placing correctly, implicit vs explicit grid confusion, and common grid layout debugging techniques.
Fix: Docker Compose depends_on Not Waiting for Service to Be Ready
How to fix Docker Compose depends_on not working — services start in order but the app still crashes because depends_on only waits for container start, not service readiness. Includes healthcheck solutions.
Fix: CORS Not Working in Express (Access-Control-Allow-Origin Missing)
How to fix CORS errors in Express.js — cors middleware not applying, preflight OPTIONS requests failing, credentials not allowed, and specific origin whitelisting issues.
Fix: .gitignore Not Working (Files Still Being Tracked)
How to fix .gitignore not working — files still showing in git status after being added to .gitignore, caused by already-tracked files, wrong syntax, nested gitignore rules, and cache issues.
Fix: Cron Job Not Running on Linux
How to fix cron jobs not running on Linux — caused by PATH issues, missing newlines, permission errors, environment variables not set, and cron daemon not running.
Fix: Next.js Environment Variables Returning undefined
How to fix Next.js environment variables returning undefined — NEXT_PUBLIC prefix rules, server vs client context, .env file loading order, and runtime vs build-time variable access.
Fix: Python asyncio Not Running / async Functions Not Executing
How to fix Python asyncio not running — coroutines never executing, RuntimeError no running event loop, mixing sync and async code, and common async/await mistakes in Python.