Before I discuss my problem, it is important to know the architecture of my application. I am working on a facebook iframe application. The iframe domain is*app-1.appspot.com. *This loads all the UX part - JS, HTML, CSS, images whatever you see. All the back end part is handled by * app-2.appspot.com*. So, whenever I have to store something in datastore, use memcache or even urlfetch, everything happens from *app-2*.
I am using Channel API for a major module of the app. And the flow is similar to what is demonstrated in the tic-tac-toe application. Client initiates a request for channel, server sends a token, client does an onopen call and tells server that it is ready and so on. The token generated is from app-2.appspot.com and it is send to the client. The client makes a call and the call goes to app-1.appspot.com instead of app-2.appspot.com. In the xhr.open(), i have explicitly mentioned the full url which includes something like app-2.appspot.com/open but somehow, I can see that the calls for channel are going to app-1.appspot.com/_ah/channel and since no channel is created on app-1, nothing comes back. Looking at the xhr() call, it seems that it is a normal AJAX POST request. If it is a normal asynchronous request, then this scenerio makes sense because i won't be able to make xhr calls to a different domain. So, here are my questions 1. The xhr() is a normal XMLHttpRequest or it is some wrapper over things which are pretty complex below? 2. Can I make a call to app-2.appspot.com, when my base domain is app-1.appspot.com? 3. If answer to question 2 is no, what are the alternatives? Can i use flash requests/response to overcome this situation? In other words, can I create a flash wrapper over Channel API so that i can get cross domain calls without any loss of functionality? 4. If appengine restricts (on the dev server/production server) that cross domain calls can not be made, is there some low level hack which can enable me to do so? People will run into these issues when they are developing applications for social networking portals like facebook and myspace. Facebook does not provides a container, so you will have to use your own container. If my code and backend both resided on app-1.appspot.com, I would probably never run into this situation. But when it comes to myspace, they have their own container, and the base domain is their domain itself. They provide APIs for doing calls. This gives rise to one more questions? 5. How do we do channel API calls inside a container of a portal? Thanks in advance, -- Pranav Prakash "temet nosce" (http://blog.myblive.com) -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
