Support devServer.proxy in configureWebpack

[ad-m]

Feature request

Allow to use devServer.proxy from webpack & make work.

What problem does this feature solve?

CORS request to API in development envrionemtn.

What does the proposed API look like?

It doesn't require new API, but it should be something like that:

module.exports = config = {
    configureWebpack: {
        devServer: {
            proxy: {
                "/api": {
                    target: "http://localhost:8090/",
                    secure: false
                }
            }
        },
    }
}; 

How should this be implemented in your opinion?

Replace deprecated (see https://github.com/webpack-contrib/webpack-serve ) webpack-serve there https://github.com/vuejs/vuepress/blob/master/lib/dev.js#L97 and use webpack-dev-server instead ( https://github.com/webpack/webpack-dev-server ).

Are you willing to work on this yourself?**

I don't know webpack enought.

[ulivz]

Thanks for the report, and it has been addressed at #1195.