How to Resolve "Rate limit exceeded" in API Gateway Security Policies
When automated clients, microservices, or frontend web applications exceed the request threshold defined in an API Gateway security policy (such as Kong, AWS...
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Python Multiprocessing Pool Hang or Freeze on Exception
A multiprocessing.Pool that hangs indefinitely rather than raising an exception when a worker function fails is a well-known and common pattern, particularly...
Nginx gRPC Reverse Proxy Returning HTTP 502 or HTTP 405 Error
Proxying gRPC traffic through Nginx requires specific configuration distinct from regular HTTP proxying — a 405 typically means Nginx is treating the request...
Nginx "Upstream Timed Out While Reading Response Header From Upstream"
This error means Nginx gave up waiting for your backend to respond within the configured timeout window — the fix depends on determining whether the backend is...
Go http.Client Memory Leak Due to Missing resp.Body.Close()
A gradually growing memory footprint in a Go application making many HTTP requests is one of the most common Go memory leak patterns, and it almost always...
Docker Compose Service depends_on Starting Before Database Is Actually Ready
Plain depends_on in Docker Compose only guarantees a dependency container has started — not that the actual service inside it (like PostgreSQL) is finished...
OAuth 2.0 PKCE Code Verifier Mismatch on Mobile App Authentication Flow
A PKCE code verifier mismatch means the verifier sent during the token exchange doesn't match the code challenge originally sent during authorization — since...
Git "RPC Failed; curl 56 Recv Failure: Connection Reset by Peer" on Large Push
This error during a large push almost always means the connection was interrupted partway through transferring a large amount of data — commonly due to an HTTP...
PostgreSQL Connection Closed Unexpectedly During Large Transaction
A connection dropping specifically during a large, long-running transaction usually comes down to one of a few specific limits being hit — a statement timeout,...