Version

3.0.2

Reproduction link

https://gist.github.com/aldencolerain/982b1a1d89bf2bd1303b86726bd15f15

Node and OS info

Node 8 / npm 6.4.1 / Ubuntu 16.04

Steps to reproduce

In vue.config.js pass a proxy setting to the dev server that is not an object.

What is expected?

When proxy in package.json is an object, each context object must have a target property specified as a url string

What is actually happening?

When proxy in package.json is as an object, each context object must have a target property specified as a url string