1 files changed, 3 insertions, 0 deletions
diff --git a/src/encoding/headermap.rs b/src/encoding/headermap.rs
index 5d1fa0a..01e1962 100644
--- a/src/encoding/headermap.rs
+++ b/src/encoding/headermap.rs
@@ -25,6 +25,9 @@ impl HeaderMap {
     pub fn get<H: Header>(&self) -> Option<Result<H>> {
         self.get_raw(H::NAME).map(H::from_str)
     }
+    pub fn get_res<H: Header>(&self) -> Result<H> {
+        self.get().ok_or(anyhow!("{} header missing", H::NAME))?
+    }
     pub fn insert_raw(&mut self, key: String, value: String) {
         self.0.push((key, value))
     }