When an iPhone/iPad/iPod tries to play a YouTube or Google Video through the embedded player or Safari, the video does not load when going through a Proxy SG.

This is a known issue with the way the application tries to request the video by requesting byte-ranges.  The workaround is to disable caching for requests that contain the HTTP header for "Range".  This will have a minimal impact to performance since it only applies to the iPod-like devices, in addition to the fact that YouTube videos are served as non-cacheable so the SG would not cache them normally.

Add the following policy entries to the Local policy on the ProxySG.

define condition YouTubeRangeRequests
    url.domain="youtube.com"
    url.domain="googlevideo.com"
end condition YouTubeRangeRequests

<Proxy>
    request.header.Range="bytes" condition=YouTubeRangeRequests bypass_cache(yes)