chore: Clean up CacheHeaderInterceptor (#33)

Author: poppoerika

src/grpc/cache_header_interceptor.rs

@@ -4,27 +4,20 @@ pub struct CacheHeaderInterceptor {
 }
 
 impl tonic::service::Interceptor for CacheHeaderInterceptor {
-    fn call(&mut self, request: tonic::Request<()>) -> Result<tonic::Request<()>, tonic::Status> {
-        let request_metadata = request.metadata().clone();
-        let mut result = {
-            let message = request.into_inner();
-            tonic::Request::new(message)
-        };
-        result.metadata_mut().insert(
+    fn call(
+        &mut self,
+        mut request: tonic::Request<()>,
+    ) -> Result<tonic::Request<()>, tonic::Status> {
+        request.metadata_mut().insert(
             "authorization",
             tonic::metadata::AsciiMetadataValue::from_str(self.auth_key.as_str()).unwrap(),
         );
         // for reasons unknown, tonic seems to be stripping out the content-type. So we need to add this as
         // a workaround so that the requests are successful
-        result.metadata_mut().insert(
+        request.metadata_mut().insert(
             "content-type",
             tonic::metadata::AsciiMetadataValue::from_str("application/grpc").unwrap(),
         );
-
-        let cache_name = request_metadata.get("cache").unwrap();
-
-        // need to re-add our `cache` header back into the interceptor or it will be stripped out
-        result.metadata_mut().insert("cache", cache_name.clone());
-        Ok(result)
+        Ok(request)
     }
 }