Programming Tutorials

  There are few things more disruptive to a developer’s flow state than an AI assistant that suddenly goes silent. You are in the middle of a complex refactor, you prompt GitHub Copilot Chat, and instead of a solution, you get a loading spinner that spins indefinitely. Eventually, the Output logs reveal the culprit: a 400 or 401 error, specifically the  Invalid Authorization Header . This guide targets professional developers and enterprise users experiencing persistent Copilot authentication failures. We will move beyond basic troubleshooting to diagnose the root cause of token desynchronization and implement a permanent fix within your VS Code environment. The Root Cause: Token Desynchronization To fix the issue, you must understand the architecture of the failure. GitHub Copilot relies on a secure handshake between your local VS Code client and GitHub’s API endpoints (typically via  api.github.com ). When you sign in, VS Code acquires an OAuth2 access token. This token...

  The era of relying exclusively on paid, cloud-hosted AI coding assistants is ending. While services like GitHub Copilot and Cursor are powerful, they come with two significant downsides: monthly subscription costs and the inherent privacy risk of sending proprietary codebase data to third-party servers. For Principal Engineers and privacy-conscious developers, the solution lies in  Local Inference . By running high-performance open-weight models like DeepSeek R1 on your own hardware, you gain total data sovereignty and zero latency networking, all without a credit card. This guide details the exact technical implementation of a local AI stack using  Ollama ,  DeepSeek R1 , and  VS Code . The Architecture: Why Local Inference Matters Before executing the setup, it is vital to understand the architectural shift. Cloud-based assistants operate via REST API calls. Every time you trigger a completion, your IDE packages the current file and cursor context, encrypts ...