Replicating the issue

VuePress issue:

config.devServer.proxy doesn't proxy, shows NotFound.vue

yarn install

Using two terminal windows, run the below at the same time:

yarn server:start

This will start an express server on port 7070 with all routes returning 'Hello World'

yarn docs:dev

This will start a basic Vuepress app running on port 8080 (assuming not already in use)

Verification of issue

Verify server is working correctly ✔

• Navigate to http://localhost:7070/auth/test

Expected Result

Should show Hello World

Actual Result

Shows Hello World ✔

Verify proxy is working correctly ✘

• Navigate to http://localhost:8080/auth/test

Expected Result

Should proxy :7070/auth/* through port 8080, therefore showing Hello World

Actual Result

Shows 404 page, from default NotFound.vue component and using vue-router ✘