Individual skill
httpclient-factory
IHttpClientFactory and typed HTTP clients for .NET 10 applications. Covers named/typed/keyed clients, DelegatingHandlers, resilience with Microsoft.Extensions.Http.Resilience, and testing patterns. Load this skill when configuring HTTP clients, adding retry/circuit breaker policies, or when the user mentions "HttpClient", "IHttpClientFactory", "AddHttpClient", "typed client", "named client", "DelegatingHandler", "resilience", "retry", "circuit breaker", "hedging", "Polly", "AddStandardResilienceHandler", "socket exhaustion", or "Refit".
skills/httpclient-factory/SKILL.md
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- Last checked
- Nov 4, 2026
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- MIT
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# HttpClient Factory
## Core Principles
1. **Never `new HttpClient()` per request** — Raw `HttpClient` creation causes socket exhaustion under load and ignores DNS changes. Use `IHttpClientFactory` to manage handler lifetimes.
2. **Keyed clients over typed clients** — Keyed DI (`.AddAsKeyed()`) is the recommended pattern in .NET 10. Typed clients captured in singletons silently break handler rotation.
3. **Resilience is not optional** — Every external HTTP call needs retry, circuit breaker, and timeout. `AddStandardResilienceHandler()` provides sensible defaults in one line.
4. **DelegatingHandlers for cross-cutting concerns** — Auth tokens, correlation IDs, and logging belong in the handler pipeline, not scattered across service methods.
## Patterns
### Named Client with Resilience
```csharp