Anthony Giretti • 11/15/2025

C# 14: Interceptors in practice with automatic correlation headers

This article explains how to use the stable C# 14 interceptor feature with .NET 10 to solve the real-world problem of propagating correlation IDs across service boundaries via HttpClient. It covers why interceptors require a Source Generator (due to non-human-writable location encoding and namespace constraints), compares interceptors to other AOP approaches, and provides a concrete implementation for automatic header injection at compile time. Aimed at developers working in distributed environments, it offers a transparent, compile-time solution to a common friction point.

0 comments

#Httpclient #Source Generators #C 14