Networking
The WebSocket That Died Every Sixty Seconds and Nobody Owned Up
A live feed that dropped on a strict interval in production and never locally. The interval was the whole clue and I ignored it for a day.
Rohit Bhadani
I write about why software breaks and how people figure it out. Founder of Krova Cloud, building isolated microVMs on our own hypervisor. Years of Shopify theme work and shared hosting before that. If I have not reproduced it, I do not publish it.
Docker
Why Your Docker Build Reinstalls Every Dependency Every Time
One changed byte early in a Dockerfile throws away everything after it. Here is how the cache key is computed and how to order instructions so it survives.
PostgreSQL
Autovacuum Is Running and Your Table Is Still Bloating
Dead tuples that never get reclaimed, a table twice the size of its data, and queries getting slower every week. Here is what blocks vacuum and how to see it.
Security
JWT Expired: When the Token Is Fine and the Clock Is Not
Tokens rejected as expired seconds after issue, or accepted long after they should have died. Both are the same bug seen from opposite ends.
Networking
You Fixed CORS and the Browser Kept Failing for Another Ten Minutes
Access-Control-Max-Age caches the preflight decision, including the one that said no. Here is why your fix looked like it did not work.
MicroVMs
The CORS Header Is Present Twice and That Is Why It Fails
You added the header at the proxy, your framework was already sending it, and the browser now rejects both. Duplicates are invalid, not additive.
MicroVMs
Debugging Production Without Touching Production
The bug only reproduces with real state. Copying the database loses the parts that matter. Cloning the whole machine keeps them.
DevOps
Consumer Lag Is Not a Throughput Problem Until You Prove It Is
Lag climbing on one partition while the rest keep up tells you something specific. Here is how to read the numbers before you add consumers that cannot help.
MicroVMs
I Let an Agent Run rm -rf and Nothing Bad Happened
The question is not whether an autonomous agent will do something destructive. It is what the destruction can reach when it does.
JavaScript
The Dashboard That Got Slower the Longer You Left It Open
A single page app that was fine for an hour and unusable by the afternoon. Three wrong hypotheses, then a heap snapshot showed forty thousand detached DOM nodes.
MicroVMs
413 Request Entity Too Large When You Already Raised the Limit
You raised the body size limit and the upload still fails. There are almost always two limits, and the one you changed is rarely the one rejecting you.
MicroVMs
The Service Is Running, Listening, and Completely Unreachable
curl works on the box and hangs from outside. Four places the packet can die, and how to tell which one killed it without guessing.