png?g=15 HTTP/1.1
Accept: */*
Referer: http://localhost:4611/chapter9/Default.aspx
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .
NET CLR 2.0.50727; WinFX RunTime 3.0.50727)
Host: r0.ortho.tiles.virtualearth.net
Connection: Keep-Alive
CHAPTER 9 ?– AJAX-STYLE MAPPING USING THE VIRTUAL EARTH SDK 213
This is the response from the VE map server:
#12 10:34:28.859 65.55.241.30:80
HTTP/1.1 200 OK
Content-Length: 17055
Content-Type: image/png
Expires: Sat, 24 May 2008 01:39:58 GMT
Server: Microsoft-IIS/6.0
Srv: 31300
Date: Mon, 21 May 2007 18:34:28 GMT
As you pan around the map, you see the same functionality??”the images being
requested, downloaded, and cached asynchronously.
In addition to panning around the map, you can zoom in and out because VE also
caches images when you zoom, providing what is effectively a smart multilevel cache of
the current map context. In other words, the VEMap control looks at the current context of
the map and caches the area outside the current view in the current zoom context as well
as a zoom-in context and a zoom-out context.
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