Long WebSocket messages are being truncated-wails dev #4211
Description
Description
While running the application with wails dev, the frontend (browser) and backend communicate over WebSocket. However, large messages fail to be delivered to the backend.
To Reproduce
Frontend (JavaScript):
// If you're using Chrome, you need a string longer than 131000 characters to trigger packet fragmentation.
// Reference: https://cse312.com/static_files/slides/3_5_WebSocket_Buffers.pdf
const data = '...';
function save() {
console.log("frontend:", data.length);
Save(data).then(result => resultText = result);
}Backend (Go):
func (a *App) Save(data string) {
fmt.Println("backend:", len(data))
}Expected behaviour
Expected: The backend Save function prints the length of the received data.
Actual: The backend Save function is not triggered.
Screenshots
No response
Attempted Fixes
No response
System Details
Wails Doctor
# Wails
Version | v2.10.1
Package Manager | apt
# System
WARNING: failed to read int from file: open /sys/devices/system/cpu/cpu0/online: no such file or directory
┌──────────────────────────────────────────────────────────┐
| OS | Ubuntu |
| Version | 20.04 |
| ID | ubuntu |
| Go Version | go1.24.1 |
| Platform | linux |
| Architecture | amd64 |
| CPU | 13th Gen Intel(R) Core(TM) i9-13900H |
| GPU | SVGA II Adapter (VMware) - Driver: vmwgfx |
| Memory | 8GB |
└──────────────────────────────────────────────────────────┘
# Dependencies
┌──────────────────────────────────────────────────────────────────────────┐
| Dependency | Package Name | Status | Version |
| *docker | docker.io | Available | 26.1.3-0ubuntu1~20.04.1 |
| gcc | build-essential | Installed | 12.8ubuntu1.1 |
| libgtk-3 | libgtk-3-dev | Installed | 3.24.20-0ubuntu1.2 |
| libwebkit | libwebkit2gtk-4.0-dev | Installed | 2.38.6-0ubuntu0.20.04.1 |
| npm | npm | Installed | 10.9.2 |
| *nsis | nsis | Available | 3.05-2 |
| pkg-config | pkg-config | Installed | 0.29.1-0ubuntu4 |
| |
└──────────────────────── * - Optional Dependency ─────────────────────────┘
# Diagnosis
Optional package(s) installation details:
- docker: sudo apt install docker.io
- nsis: sudo apt install nsis
SUCCESS Your system is ready for Wails development!Additional context
No response