[Users] Question about WMSCapabilities example

[Penelope Town]

Hi GeoExt user,

I am recently playing with the WMSCapabilities example in GeoExt release
0.6. The original example is using a local static XML (WMS capabilities
file), which I was trying to switch to a really WMS GetCapabilities call to
remote server. The interesting thing is that it won't work until I set the
ProxyHost in OpenLayers to a servlet proxy page (e.g. OpenLayers.ProxyHost =
"<proxy_url>";) I am a little confused here, does GeoExt rely on
OpenLayers's Ajax library to send XHR request? Why it benefits from the
OpenLayers.ProxyHost?

Another thing I found is that if I switch to use the GeoExt from either
trunk src or 0.6 src, the same call doesn't work even though I set the
OpenLayers.ProxyHost. Can you anyone shed some light on it? Or what is
GeoExt native way to configure a proxy to call remote WMS/WFS service?

Thanks,
Penny
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