Reverse proxy heroku app to wordpress blog
Well I found a solution, for whatever reason in the WP settings for the permalink, it didn't like any of the default options except for the form where it can retrieve the post by id. (http://www.domain.com/blog/?p=123)
For SEO purposes I wanted the title of the post to be in the URL. So I entered in the custom structure field: /index.php/%postname%/
It seems like it was requiring index.php for wordpress to handle the routing properly.