sounds good! But I would need a minimal example to implement this solution. Do you have some piece of code at hand?In addition: What do you mean by "dynamic host page"? My host page is minimalistic and without content. When tie application starts I create a DockiLayoutPanel and place it as the root panel.
It means that you do not use a static index.html as host page but an index.jsp or a servlet: http://www.gwtproject.org/articles/dynamic_host_page.html
The most basic implementation on how to inject additional JSON encoded data into the host page is already covered by the link above. If you want more structured data then you can use JSO's or AutoBeans instead of GWT's Dictionary class (which only supports key value constructs)
To add a custom header to each GWT-RPC request you need to implement a custom RpcRequestBuilder by extending it and overriding doFinish(RequestBuilder). You can configure your GWT-RPC service to use the custom RpcRequestBuilder by casting the service into ServiceDefTarget and call the appropriate setter. You have to do this for all your services.
You can also handle the HTTP Response code in your custom RpcRequestBuilder by wrapping the provided RequestCallback with a customized RequestCallback. This can be done by overriding doSetCallback(RequestBuilder, RequestCallback). For example your custom RequestCallback could fire an OutdatedAppEvent() on the event bus so that some other class can provide user feedback and finally reload the app.
-- J.
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