ASP.NET WebAPI Ajax with progress

I have a really long webAPI request that basically does the follow :

1. retrieves a list of item categories from the db 
2. for each category, retrieve all the items in the category

Now, the entire process takes a very long time and I don't want the user to wait till the entire process is over, if a category has finished loading I want it to return to the client

Does anyone know how I can do that? Send a request and get progress notifications by the server whenever a part of the request has finished?

Solution

You could use SignalR to send the data from the server to the client when it's available.

The other option is polling from the client. The client makes the initial request, which triggers a server side process that prepares the data and keeps it somewhere (in memory, in a database). Then the client polls the server for new available data until the server process finishes.

Is this declaration UB?
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