MySQL "Lock Wait Timeout Exceeded" Try Restarting Transaction
"Lock wait timeout exceeded" is different from a deadlock — it means your transaction waited the full configured timeout for a lock held by another...
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Bash Script Fails With "$'\r': Command Not Found" (CRLF Line Endings)
The $'\r': command not found error is a strong, specific signal of Windows-style line endings (CRLF) in a script meant to run on Linux/Unix, which expects...
Nginx 504 Gateway Timeout on Long-Running API Request
A 504 Gateway Timeout on a request that's legitimately slow (a large report generation, a heavy computation, a batch operation) means Nginx gave up waiting for...
Nginx WebSockets Connection Failing With 400 Bad Request
A WebSocket connection failing with 400 Bad Request through Nginx almost always means Nginx isn't forwarding the specific headers required for the...
Gin Custom Validation Error Messages Returning Raw Internal Errors
When Gin's binding validation errors are returned to clients as raw, unfriendly text straight from the underlying validator library, it's because the default...
Postgres "LOCK TABLE" Deadlock Waiting Forever
An explicit LOCK TABLE statement that just hangs, rather than producing Postgres's usual automatic deadlock error, usually means it's waiting on a lock held by...
Docker Container Memory Limit Reached, Killed by OOMKiller
A container killed by the OOMKiller (Out-Of-Memory Killer) means it tried to use more memory than its configured limit allows, and the Linux kernel forcibly...
Rate Limiting an API Correctly, Common Mistakes
Rate limiting looks simple on the surface — count requests, block when a threshold is exceeded — but several common implementation mistakes either leave the...
Session Hijacking, Practical Prevention Basics
Session hijacking means an attacker obtains a valid session identifier belonging to another user and uses it to impersonate them, without needing to know their...