1 files changed, 17 insertions, 6 deletions
diff --git a/ext/flash/01_http.js b/ext/flash/01_http.js
index 4d0112c5b..fe503ed05 100644
--- a/ext/flash/01_http.js
+++ b/ext/flash/01_http.js
@@ -31,11 +31,12 @@ const {
   PromisePrototypeCatch,
   PromisePrototypeThen,
   SafePromiseAll,
+  TypedArrayPrototypeGetByteLength,
+  TypedArrayPrototypeGetSymbolToStringTag,
   TypedArrayPrototypeSet,
   TypedArrayPrototypeSubarray,
   TypeError,
   Uint8Array,
-  Uint8ArrayPrototype,
 } = primordials;
 
 const statusCodes = {
@@ -188,9 +189,15 @@ function http1Response(
     str += body ?? "";
   } else {
     const head = core.encode(str);
-    const response = new Uint8Array(head.byteLength + bodyLen);
+    const response = new Uint8Array(
+      TypedArrayPrototypeGetByteLength(head) + bodyLen,
+    );
     TypedArrayPrototypeSet(response, head, 0);
-    TypedArrayPrototypeSet(response, body, head.byteLength);
+    TypedArrayPrototypeSet(
+      response,
+      body,
+      TypedArrayPrototypeGetByteLength(head),
+    );
     return response;
   }
 
@@ -303,7 +310,7 @@ async function handleResponse(
       }
       isStreamingResponseBody = !(
         typeof respBody === "string" ||
-        ObjectPrototypeIsPrototypeOf(Uint8ArrayPrototype, respBody)
+        TypedArrayPrototypeGetSymbolToStringTag(respBody) === "Uint8Array"
       );
     } else {
       if (innerResp.body.streamOrStatic.consumed === true) {
@@ -318,7 +325,9 @@ async function handleResponse(
 
   const ws = resp[_ws];
   if (isStreamingResponseBody === false) {
-    const length = respBody.byteLength || core.byteLength(respBody);
+    const length = typeof respBody === "string"
+      ? core.byteLength(respBody)
+      : TypedArrayPrototypeGetByteLength(respBody);
     const responseStr = http1Response(
       method,
       innerResp.status ?? 200,
@@ -394,8 +403,10 @@ async function handleResponse(
             innerResp.status ?? 200,
             innerResp.headerList,
             null,
+            // deno-lint-ignore prefer-primordials
             respBody.byteLength,
           ),
+          // deno-lint-ignore prefer-primordials
           respBody.byteLength,
           false,
           respondFast,
@@ -722,7 +733,7 @@ function createRequestBodyStream(serverId, token) {
     token,
   );
   if (!firstRead) return null;
-  let firstEnqueued = firstRead.byteLength == 0;
+  let firstEnqueued = TypedArrayPrototypeGetByteLength(firstRead) === 0;
 
   return new ReadableStream({
     type: "bytes",