I have been having issues with this application because of the proxy page. According to the help, in order to use ArcGIS Online web maps, you have to set up a proxy page. I didn't do that and when I was developing the application, most components worked without issues in Chrome and Firefox. Lately though, I have noticed that the application, which supports editing, does not apply edits from Internet Explorer. The console gives an error message explaining that it is trying to reach a url through the proxy page and is not succeeding because the proxy page does not exist. As far as I know, S3 does not support this proxy page because it requires an application like PHP or ASP.Net.
Has anyone had any experience with this? I am thinking my next step may be to try and deploy this web application using AWS Elastic Beanstalk instead. Has anyone had any luck with that?