heroku deployment

 Few lessons I learned when I deployed react apps.

1. Show to start up:
   Need to switch another buildpacks intead of heroku default node.js
   

   heroku buildpacks:set mars/create-react-app -a <appname>

2. Error of no web process:
   

   at=error code=H14 desc="No web processes running" method=GET path="/"

   
   To solve it, run
   

   heroku ps:scale web=1

   
   
3. PUBLIC_URL
   In the package.json, I have :
   "homepage": "http://mywebsite.com/relativepath"
   It's for deploying to github some time I did and I just forgot it.
   That took me a while to figure out.