Flask CORS Blocking Requests From Local Network IP
A Flask API that works fine when accessed from localhost but gets blocked by CORS when accessed from another device on the local network (like a phone testing...
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How to Reset PostgreSQL Password Inside Docker Container
Resetting a PostgreSQL password inside a Docker container is a bit different from a normal installation, because you're working through docker exec rather than...
Postgres Slow Query on Indexed Column, Why
Having an index on a column doesn't guarantee PostgreSQL will actually use it, or that using it will make your query fast. When a query stays slow despite an...
Gin CORS Error Blocking React Native Requests
A CORS error between a React Native app and a Gin backend is technically a browser-enforced restriction, but it commonly shows up during development with tools...
Gin Router Returning 404 on Valid Route
When a Gin route returns a 404 even though the handler is clearly registered and the path looks correct, the cause is almost always a subtle mismatch between...
Docker Build Cache Not Invalidating After File Change
If you change a file in your project but docker build keeps producing an image with the old content, Docker isn't actually ignoring your change — it's reusing...
Docker Container Can't Connect to Host PostgreSQL
When a containerized application needs to reach a PostgreSQL server running directly on your host machine (not inside another container), connection failures...
Docker Container Exits Immediately With No Error Message
If your Docker container starts and then exits immediately without printing any error, it usually means the main process inside the container finished running...