Introduction

1. What This Module Covers

The scaling capstone ended at a boundary: at a million requests per second, the interesting questions stopped being about servers and became about the edge: what gets in, what gets turned away, what gets answered without ever waking a server. This module is that boundary: nine patterns governing how traffic enters, gets policed, gets shaped, and: between your own services: how it flows internally.

Nine patterns sounds like a lot. Two facts shrink it.