Add is_missing method to typed header rejection reason (#2503)

axum-extra/CHANGELOG.md

@@ -9,8 +9,10 @@ and this project adheres to [Semantic Versioning].
 
 - **added:** Implement `TypedPath` for `WithRejection<TypedPath, _>`
 - **fixed:** Documentation link to `serde::Deserialize` in `JsonDeserializer` extractor ([#2498])
+- **added:** Add `is_missing` function for `TypedHeaderRejection` and `TypedHeaderRejectionReason` ([#2503])
 
 [#2498]: https://github.com/tokio-rs/axum/pull/2498
+[#2503]: https://github.com/tokio-rs/axum/pull/2503
 
 # 0.9.1 (29. December, 2023)
 

axum-extra/src/typed_header.rs

@@ -123,6 +123,14 @@ impl TypedHeaderRejection {
     pub fn reason(&self) -> &TypedHeaderRejectionReason {
         &self.reason
     }
+
+    /// Returns `true` if the typed header rejection reason is [`Missing`].
+    ///
+    /// [`Missing`]: TypedHeaderRejectionReason::Missing
+    #[must_use]
+    pub fn is_missing(&self) -> bool {
+        self.reason.is_missing()
+    }
 }
 
 /// Additional information regarding a [`TypedHeaderRejection`]
@@ -136,6 +144,16 @@ pub enum TypedHeaderRejectionReason {
     Error(headers::Error),
 }
 
+impl TypedHeaderRejectionReason {
+    /// Returns `true` if the typed header rejection reason is [`Missing`].
+    ///
+    /// [`Missing`]: TypedHeaderRejectionReason::Missing
+    #[must_use]
+    pub fn is_missing(&self) -> bool {
+        matches!(self, Self::Missing)
+    }
+}
+
 impl IntoResponse for TypedHeaderRejection {
     fn into_response(self) -> Response {
         (http::StatusCode::BAD_REQUEST, self.to_string()).into_response()