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...
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SQL Injection in a Parameterized Query, Is It Still Possible
Parameterized queries eliminate the classic SQL injection vector, where user input is concatenated directly into a query string — but they don't make injection...
MySQL Foreign Key Constraint Fails on Delete
A foreign key constraint failure on delete means MySQL is protecting referential integrity — you're trying to delete a row that other rows still reference, and...
Linux "Command Not Found" After Installing via apt
Getting "command not found" immediately after apt install reports success almost always means the installed binary isn't located in a directory your shell's...
Linux systemd Service Fails to Start on Boot
A systemd service that starts fine manually but fails specifically during boot almost always means it's starting before something it actually depends on is...
Nginx Location Block Priority, Why the Wrong One Matches
When a request gets handled by an unexpected location block despite a seemingly more specific one existing in the config, the cause is almost always a...
Nginx "Worker_connections Exceeded" Error Fix
Hitting Nginx's worker_connections limit means each worker process has reached the maximum number of simultaneous connections it's configured to handle — this...
Git Ignore File Not Working for Already Tracked Files
Adding a file or pattern to .gitignore and finding it still shows up in git status almost always means the file was already being tracked by Git before you...
Git Stash Apply Conflict, How to Resolve Safely
A conflict when applying a stash means the changes you stashed away overlap with changes made to the same lines since you stashed them — Git needs your help...