javascript file only partially loads through Access Gateway after upgrading to NAM 4.2

NAM 4.2 customer is seeing an issue where a javascript file for a web app is only partially downloaded when going through NAM. This did not happen before the upgrade from 4.1 to 4.2.1. If you look at the attached Fiddler trace, you will notice the body sizes returned by the AG are different between working NAM 4.1 and non working NAM 4.2.

Looking at the response from Web server to AG, the content returned is the same so the AG is responsible for changing the sizes. Looking at the HTTP headers in detail, we can see the data is compressed and chunked.

By forcing HTTP 1.0 to origin server, we disable the chunking and compression headers and all works fine, so the issue is related to this.

Fixed in NAM 4.2.2 and NAM 4.3.1. On older builds, workaround issue with the web server 'force http 1.0 to origin server' setting.