[OpenLayers-Users] Ability to add dynamic layer

[Phil Scadden]

We have done something like this but it depends very heavily on 
server-side configuration of the applications. Firstly, our proxy doesnt 
use a whitelist in code. On the server, we have configuration file which 
holds all the details of the current map configuration (delivered to 
client as JSON and the client constructs the application from the config 
- means we have many different map application with a single code base). 
The proxy gets its whitelist from that config file. Obviously dont want 
to read it every time so list is cached with notification object to 
force reread. Where users can browse for other WMS/WFS services, the 
local proxy is extended by session-specific config. The browsing and 
parsing of getcaps documents is all server-side and when user add a 
service, it is added to the config file. I havent looked at that code 
for a few years so my memory of details a bit hazy, but that is the 
central idea.

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