chore(middleware-expect-continue): do not set expect header if using …

…FetchHttpHandler
aws · May 1, 2024 · 5e8425d · 5e8425d
1 parent c4fb66d
commit 5e8425d
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/packages/middleware-expect-continue/src/index.ts b/packages/middleware-expect-continue/src/index.ts
@@ -11,17 +11,20 @@ import {
 
 interface PreviouslyResolved {
   runtime: string;
+  requestHandler: any;
 }
 
 export function addExpectContinueMiddleware(options: PreviouslyResolved): BuildMiddleware<any, any> {
   return <Output extends MetadataBearer>(next: BuildHandler<any, Output>): BuildHandler<any, Output> =>
     async (args: BuildHandlerArguments<any>): Promise<BuildHandlerOutput<Output>> => {
       const { request } = args;
       if (HttpRequest.isInstance(request) && request.body && options.runtime === "node") {
-        request.headers = {
-          ...request.headers,
-          Expect: "100-continue",
-        };
+        if (options.requestHandler?.constructor?.name !== "FetchHttpHandler") {
+          request.headers = {
+            ...request.headers,
+            Expect: "100-continue",
+          };
+        }
       }
       return next({
         ...args,