I run the angular dev server with ng serve:
$ ng serve
10% building 3/3 modules 0 activeℹ ｢wds｣: Project is running at http://localhost:4200/webpack-dev-server/
ℹ ｢wds｣: webpack output is served from /
ℹ ｢wds｣: 404s will fallback to //index.html
chunk {main} main.js, main.js.map (main) 49.4 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 264 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 6.15 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 10.1 kB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 4.08 MB [initial] [rendered]
Date: 2019-08-27T19:37:48.511Z - Hash: df1053ce80b7b0af763f - Time: 8515ms
** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
ℹ ｢wdm｣: Compiled successfully.
it's running on an EC2 instance and listening on port 4200. My load balancer is doing health checks on /, but for some reason the dev server is not responding with a 200 on that route?
Is there some way to configure the Angular dev server to respond with a 200 on some route, it could be / or some other route?
You are binding to localhost. Nothing external can reach your server. If you really want you can ng serve --host 0.0.0.0 but this is not a good idea. The dev server is not built to be secure.