I'm working with a customer that has WSA deployed in transparent mode, using WCCP to intercept and redirect traffic to the WSAs. They complained that https://www.speedtest.net/ doesn't work. Upon loading, the website performs a latency check and shows a status message, 'Finding optimal server', which ultimately times out (approx 10secs) and then redirects the user to an error screen stating that there's network latency issues.
As part of my troubleshooting, I tried explicitly configuring the WSA as the proxy server in Internet Options. With the WSA explicitly configured, https://www.speedtest.net/ loads normally and works 100% (desired result).
I understand that the HTTP Headers clients send are different between the two WSA implementation modes, I'm just trying to understand the specifics of why, this issue is happening.
I'm hoping to be able to resolve the issue to allow the customer to continue using a transparent WSA deployment with https://www.speedtest.net/ working as normal.