• Operating System: any
• Node Version: any
• NPM Version: any
• webpack Version: any
• webpack-dev-server Version: any
• Browser: any

• This is a bug
• This is a modification request

Code

// webpack.config.js ... devServer: { transportMode: 'ws', proxy: { '/api': { target: 'http://localhost:8888', ws: true, }, }, }, ...

Expected Behavior

Proxying Websockets works similar to transportMode: 'sockjs'

Actual Behavior

Websocket connections get closed with 400 Bad Request error.

For Bugs; How can we reproduce the behavior?

Simultaneously enable transportMode: 'ws' and proxy: { ws: true }