fix: event handler not removed after responding to request

related: #65

Author: stegano

src/index.ts

@@ -85,8 +85,14 @@ const httpProxyMiddleware = async (
           proxyReq.end();
         }
       }) as any)
-      .once("proxyRes", resolve as any)
-      .once("error", reject)
+      .once("proxyRes", ((proxyRes: any) => {
+        proxy.removeAllListeners();
+        return reject(proxyRes)
+      }) as any)
+      .once("error", ((err: any) => {
+        proxy.removeAllListeners();
+        return reject(err);
+      }) as any)
       .web(req, res, {
         changeOrigin: true,
         ...serverOptions