Fix memory leak in dev server

dist/functions/server/bunext-req-handler.js

@@ -16,15 +16,19 @@ const HMR_RETRY_COOLDOWN_MS = 5000;
 let lastHmrRetryTime = 0;
 export default async function bunextRequestHandler({ req: initial_req, server, }) {
     const is_dev = isDevelopment();
-    let req = initial_req.clone();
+    const middleware = global.BUNEXT_CONSTANTS.config?.middleware;
+    // Middleware may consume `initial_req`'s body, so it gets its own copy.
+    // Cloning tees the body stream and buffers whatever one side doesn't
+    // read, so only pay for it when middleware is configured.
+    let req = middleware ? initial_req.clone() : initial_req;
     try {
         let url = new URL(req.url);
         if (checkExcludedPatterns({ path: url.pathname })) {
             return Response.json({ success: false, msg: `Invalid Path` }, { status: 404 });
         }
         let response = undefined;
-        if (global.BUNEXT_CONSTANTS.config?.middleware) {
-            const middleware_res = await global.BUNEXT_CONSTANTS.config.middleware({
+        if (middleware) {
+            const middleware_res = await middleware({
                 req: initial_req,
                 url,
             });