1 files changed, 7 insertions, 1 deletions
diff --git a/ext/http/00_serve.ts b/ext/http/00_serve.ts
index 87798656f..6d23685d8 100644
--- a/ext/http/00_serve.ts
+++ b/ext/http/00_serve.ts
@@ -511,9 +511,15 @@ function mapToCallback(context, callback, onError) {
         );
       }
 
+      if (response.type === "error") {
+        throw new TypeError(
+          "Return value from serve handler must not be an error response (like Response.error())",
+        );
+      }
+
       if (response.bodyUsed) {
         throw new TypeError(
-          "The body of the Response returned from the serve handler has already been consumed.",
+          "The body of the Response returned from the serve handler has already been consumed",
         );
       }
     } catch (error) {