The latest articles on DEV Community by Mohamed Zahi (@mohamed_zahi_00). https://dev.to/mohamed_zahi_00 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F2465273%2F6c89ba92-1a66-49bc-9e6b-28efcff23912.png https://dev.to/mohamed_zahi_00 en Mohamed Zahi Thu, 21 Nov 2024 16:51:45 +0000 https://dev.to/mohamed_zahi_00/422-error-with-jwtrequired-in-flask-app-deployed-on-vps-with-nginx-4ggm https://dev.to/mohamed_zahi_00/422-error-with-jwtrequired-in-flask-app-deployed-on-vps-with-nginx-4ggm <p>Hi everyone, </p> <p>I'm facing an issue while deploying my Flask application on a VPS server with Nginx. The app works fine when tested locally and also when hosted on Heroku. However, when deployed on my VPS, any route protected by <code>@jwt_required()</code> throws a <strong>422 error</strong>. </p> <h3> Details: </h3> <ul> <li> <p><strong>Server Setup:</strong> </p> <ul> <li>Ubuntu VPS </li> <li>Nginx as a reverse proxy </li> <li>Gunicorn to run the Flask app </li> <li>Flask-JWT-Extended for JWT authentication </li> </ul> </li> <li> <p><strong>What Works:</strong> </p> <ul> <li>All API routes without the <code>@jwt_required()</code> decorator work perfectly. </li> <li>The same application works as expected (even with <code>@jwt_required()</code>) when deployed on Heroku. </li> </ul> </li> <li> <p><strong>What Fails:</strong> </p> <ul> <li>Any route using the <code>@jwt_required()</code> decorator on the VPS setup returns a <strong>422 error</strong>. </li> <li>Removing <code>@jwt_required()</code> allows the routes to work normally. </li> </ul> </li> </ul> <h3> Things I’ve Tried: </h3> <ul> <li>Verified that the JWT token is correctly passed in the <code>Authorization</code> header. </li> <li>Checked for mismatched <code>SECRET_KEY</code> and token expiration settings. </li> <li>Confirmed that the app uses the correct <code>ACCESS_TOKEN_EXPIRES</code> and <code>ALGORITHM</code>. </li> <li>Tested with Postman and curl—no difference. </li> </ul> <p>I suspect it might have something to do with Nginx or Gunicorn configurations, but I can’t figure out what. Could it be related to how headers or JSON bodies are being handled by the server? </p> <p>Any suggestions or troubleshooting tips would be greatly appreciated! </p> <p>Thanks in advance! </p> python nginx flask ubuntu