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Chapter 08
Secure an API and Isolate Write Races
Two users updating one record at the same time must not corrupt it.
What you will be able to do: You can stop lost updates with compare-and-swap versioning and lock the API down with security headers.
Tools you will use
ExpressHelmetHTTP semantics
Scripts shipped with this chapter
server.js
Your Day 1 checklist
- 1Apply security headers
- 2Validate every request body
- 3Add a version field for optimistic locking
- 4Return 409 on a lost update
The written lessons, command annotations and troubleshooting guides are part of the paid masterclass and are delivered with your access.