From f3e7ac23328a8870391273f0b011a37044130727 Mon Sep 17 00:00:00 2001
From: SleeplessOne1917 <insomnia-void@protonmail.com>
Date: Sun, 24 Dec 2023 17:29:22 -0500
Subject: [PATCH] Add From impl for header map references

---
 actix-http/CHANGES.md        |  4 ++++
 actix-http/src/header/map.rs | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/actix-http/CHANGES.md b/actix-http/CHANGES.md
index 3068b4ce2..ed3d3536d 100644
--- a/actix-http/CHANGES.md
+++ b/actix-http/CHANGES.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Changed
+
+- Implement `From<&HeaderMap>` for `http::HeaderMap` and vice versa.
+
 ## 3.5.0
 
 ### Changed
diff --git a/actix-http/src/header/map.rs b/actix-http/src/header/map.rs
index d8a63b573..8445159d3 100644
--- a/actix-http/src/header/map.rs
+++ b/actix-http/src/header/map.rs
@@ -643,6 +643,15 @@ impl From<http::HeaderMap> for HeaderMap {
     }
 }
 
+impl<T> From<&T> for HeaderMap
+where
+    T: Into<http::HeaderMap>,
+{
+    fn from(map: &T) -> Self {
+        map.to_owned().into()
+    }
+}
+
 /// Convert our `HeaderMap` to a `http::HeaderMap`.
 impl From<HeaderMap> for http::HeaderMap {
     fn from(map: HeaderMap) -> Self {
@@ -650,6 +659,13 @@ impl From<HeaderMap> for http::HeaderMap {
     }
 }
 
+/// Convert our `&HeaderMap` to a `http::HeaderMap`.
+impl From<&HeaderMap> for http::HeaderMap {
+    fn from(map: &HeaderMap) -> Self {
+        map.to_owned().into()
+    }
+}
+
 /// Iterator over removed, owned values with the same associated name.
 ///
 /// Returned from methods that remove or replace items. See [`HeaderMap::insert`]