/*******************************************************************************
*
* Copyright (c) 2025 - 2026 Haixing Hu.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0.
*
******************************************************************************/
//! Header injector abstraction for outgoing requests.
use HeaderMap;
use ArcMutatingFunction;
use crateHttpResult;
/// Header injector function used to mutate outgoing request headers.
///
/// This alias keeps the HTTP-domain name while directly reusing
/// [`ArcMutatingFunction`], so callers can construct injectors with
/// `HttpHeaderInjector::new(...)`.
pub type HttpHeaderInjector = ;