diff --git a/confetti-box/src/lib.rs b/confetti-box/src/lib.rs
index 18bbf59..c85053e 100644
--- a/confetti-box/src/lib.rs
+++ b/confetti-box/src/lib.rs
@@ -307,7 +307,7 @@ pub async fn websocket_upload(
 
             hasher.update(&message);
 
-            stream.send(rocket_ws::Message::Text(json::serde_json::ser::to_string(&offset).unwrap())).await.unwrap();
+            stream.send(rocket_ws::Message::binary(offset.to_le_bytes().as_slice())).await.unwrap();
 
             file.write_all(&message).await.unwrap();
 
@@ -347,6 +347,7 @@ pub async fn websocket_upload(
         file.flush().await.unwrap();
 
         stream.send(rocket_ws::Message::Text(json::serde_json::ser::to_string(&constructed_file).unwrap())).await?;
+        stream.close(None).await?;
 
         Ok(())
     })))
diff --git a/confetti-box/web/request.js b/confetti-box/web/request.js
index 1d95f0e..afbcce0 100644
--- a/confetti-box/web/request.js
+++ b/confetti-box/web/request.js
@@ -220,6 +220,7 @@ async function uploadFileWebsocket(file, duration, maxSize) {
     new_uri += "//" + loc.host;
     new_uri += "/upload/websocket?name=" + file.name +"&size=" + file.size + "&duration=" + parseInt(duration);
     const socket = new WebSocket(new_uri);
+    socket.binaryType = "arraybuffer";
 
     const chunkSize = 5_000_000;
     socket.addEventListener("open", (_event) => {
@@ -235,14 +236,18 @@ async function uploadFileWebsocket(file, duration, maxSize) {
 
     return new Promise(function(resolve, _reject) {
         socket.addEventListener("message", (event) => {
-            const response = JSON.parse(event.data);
-            if (response.mmid == null) {
-                const progress = parseInt(response);
+            if (event.data instanceof ArrayBuffer) {
+                const view = new DataView(event.data);
+                console.log(view.getBigUint64(0, true));
+                const progress = parseInt(view.getBigUint64(0, true));
                 uploadProgressWebsocket(progress, progressBar, progressText, file.size);
             } else {
                 // It's so over
-                socket.close();
+                if (!socket.CLOSED) {
+                    socket.close();
+                }
 
+                const response = JSON.parse(event.data);
                 uploadComplete(response, 200, progressBar, progressText, linkRow);
                 resolve();
             }