Streaming Media Supplement sa2150 and sa2250

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Chapter 4 Understanding Media-IXT and WMT
Figure 4-6. WMT transparent, forward proxy caching example (beginning)
Figure 4-7. WMT transparent, forward proxy caching example (concluded)
Window s
Media Server
Cl i en t b r o w se r
with Windows
Media Player
L4 Sw it ch
Web Server
The browser sends out an HTTPrequest addressed to port 80 of a Windows Media origin server.
Aayer4
switch intercepts the HTTP request and redirectsit to Media-IXT.
l
dbh flfhM e ia-IXT o t ains t e WM T meta i e rom t e HTTP server.
Media-IXTrewritesthe contentsof the WMT metafile.
Media-IXT serves the metafile to the browser. The rewritten metafile directs Windows
Media Player to obtain streaming media content from Media-IXT.
The browser passes t he WM T met af ile t o Window s M edia Player.
1
2
3
4
5
http
1
2
to WMPlayer
from browser
6
5
rewritten WMT metafile
WMT met afile
6
4
3
Me ia-IXTd
Me ia-IXTd
Client browser
with Windows
Media Player
L4 Sw i t ch
Window s
Media Server
Web Server
Windows Media Player contacts
Media-IXT on the MMSport, passing the rewritten URL.
Windows Media Server.
metadata in
Media-IXT'scache. Media-IXTfindsan exact match,meaning the
content is in cache and fresh.
7
8
9
1 0
port
1755
7
mms
7
metadata
8
9
1 0
udp
Media-IXT obtainsmetadata about the media content invoked by the URL from the origin
Media-IXT tries to find a match between the origin Window s Media Server's metadata and
Media-IXT servesthe content from cache.