fix goroutine leak in proxy raw mode

Author: aldas

middleware/proxy.go

@@ -175,9 +175,15 @@ func proxyRaw(t *ProxyTarget, c echo.Context, config ProxyConfig) http.Handler {
 
 		go cp(out, in)
 		go cp(in, out)
-		err = <-errCh
-		if err != nil && err != io.EOF {
-			c.Set("_error", fmt.Errorf("proxy raw, copy body error=%w, url=%s", err, t.URL))
+
+		// Wait for BOTH goroutines to complete
+		err1 := <-errCh
+		err2 := <-errCh
+
+		if err1 != nil && err1 != io.EOF {
+			c.Set("_error", fmt.Errorf("proxy raw, copy body error=%w, url=%s", err1, t.URL))
+		} else if err2 != nil && err2 != io.EOF {
+			c.Set("_error", fmt.Errorf("proxy raw, copy body error=%w, url=%s", err2, t.URL))
 		}
 	})
 }