---
title: header
summary: HTTP header names, values, and constants for standardized header names.
url: https://www.fastly.com/documentation/reference/compute/sdks/rust/fastly/http/header/
---

**Kind:** Module  
**Package:** fastly 0.13.1  
**Path:** `fastly::http::header`

HTTP header names, values, and constants for standardized header names.

## Constants

### CDN_LOOP

**Type:** `HeaderName`  
**Flags:** read-only  
**Source:** https://docs.rs/crate/fastly/0.13.1/source/src/http.rs#48

RFC8586: Loop Detection in Content Delivery Networks