docs: add proxying a vue app

Author: jsjoeio

docs/guide.md

@@ -87,7 +87,7 @@ we recommend using another method, such as [Let's Encrypt](#let-encrypt) instead
    # This is the same as the above SSH command, but it runs in the background
    # continuously. Be sure to add `mutagen daemon start` to your ~/.bashrc to
    # start the mutagen daemon when you open a shell.
-   
+
    mutagen forward create --name=code-server tcp:127.0.0.1:8080 < instance-ip > :tcp:127.0.0.1:8080
    ```
 
@@ -348,3 +348,22 @@ You should then be able to visit `https://my-code-server-address.io/absproxy/300
 code-server!
 
 > We highly recommend using the subdomain approach instead to avoid this class of issue.
+
+### Proxying to a Vue app
+
+Similar to the situation with React apps, you have to make a few modifications to proxy a Vue app.
+
+1. add `vue.config.js`
+2. update the values to match this (you can use any free port):
+```js
+module.exports = {
+  devServer: {
+    port: 3454,
+    sockPath: 'sockjs-node',
+  },
+  publicPath: "/absproxy/3454",
+}
+```
+3. access app at `<code-server-root>/absproxy/3454` e.g. `http://localhost:8080/absproxy/3454`
+
+Read more about `publicPath` in the [Vue.js docs](https://cli.vuejs.org/config/#publicpath)