From 63b615249443b8f897018f21473c2f1f8e43663c Mon Sep 17 00:00:00 2001
From: Andre Silva <andre.beat@gmail.com>
Date: Fri, 17 Jun 2016 01:51:34 +0100
Subject: [PATCH] fix(headers): Remove raw part when getting mutable reference
 to typed header

If you get a mutable reference to a typed header it is possible to make
the two representations be out of sync. To avoid this, after parsing the
raw part it should be removed.

Fixes #821.
---
 src/header/internals/item.rs | 3 +++
 src/header/mod.rs            | 1 +
 2 files changed, 4 insertions(+)

diff --git a/src/header/internals/item.rs b/src/header/internals/item.rs
index 5b1eff92a6..60c6972325 100644
--- a/src/header/internals/item.rs
+++ b/src/header/internals/item.rs
@@ -78,6 +78,9 @@ impl Item {
                 Err(_) => ()
             }
         }
+        if self.raw.is_some() && self.typed.get_mut(tid).is_some() {
+            self.raw = OptCell::new(None);
+        }
         self.typed.get_mut(tid).map(|typed| unsafe { typed.downcast_mut_unchecked() })
     }
 }
diff --git a/src/header/mod.rs b/src/header/mod.rs
index 53499f80f1..661c45a82d 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -639,6 +639,7 @@ mod tests {
     fn test_get_mutable() {
         let mut headers = Headers::from_raw(&raw!(b"Content-Length: 10")).unwrap();
         *headers.get_mut::<ContentLength>().unwrap() = ContentLength(20);
+        assert_eq!(headers.get_raw("content-length").unwrap(), &[b"20".to_vec()][..]);
         assert_eq!(*headers.get::<ContentLength>().unwrap(), ContentLength(20));
     }