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In my Google App Engine app I want to pass this user information
user = users.get_current_user()
to the Chrome extension in a url paramenter when the user clicks a button in the app.
How can I do this?
I read about Cross-Origin HMLHttpRequest but that seems about sending info to the app not about receiving.
This is a follow up to my other questions on this subject.
You can’t pass information to the background via a URL parameter like this, but you’ve got a couple of options.
Probably the easiest way to do this would be to have the extension inject a content script in to your app. Since the content script runs in the context your your web app, it has access to the user details and any other information you might want to pass.
Then, via Message Passing (see http://code.google.com/chrome/extensions/messaging.html), you could send a message to the background page with the information that you’re trying to send.