fix: reply encoding

[dai-shi]

following facebook/react#26360

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[dai-shi]

Not sure if doing this will set content-type header for form data.

[dai-shi]

It works.

[dai-shi]

Did an experiment:

diff --git a/examples/04_callserver/src/Counter.tsx b/examples/04_callserver/src/Counter.tsx
index c55c50d..d0dac48 100644
--- a/examples/04_callserver/src/Counter.tsx
+++ b/examples/04_callserver/src/Counter.tsx
@@ -21,6 +21,18 @@ export const Counter = ({
         >
           greet("client:" + count) = {text}
         </button>
+        <button
+          onClick={async () => {
+            const res = await greet(
+              new Promise((resolve) =>
+                setTimeout(() => resolve("from promise"), 1000)
+              )
+            );
+            console.log(res);
+          }}
+        >
+          greet with delay
+        </button>
       </p>
       <h3>This is a client component.</h3>
     </div>
diff --git a/examples/04_callserver/src/funcs.ts b/examples/04_callserver/src/funcs.ts
index 119d09f..d7540fb 100644
--- a/examples/04_callserver/src/funcs.ts
+++ b/examples/04_callserver/src/funcs.ts
@@ -1,3 +1,3 @@
 "use server";
 
-export const greet = (name: string) => `Hello ${name} from server!`;
+export const greet = async (name: string) => `Hello ${await name} from server!`;