In 99% of the cases where someone reports this issue it turns out that they've configured the response body to stream to the client as it is read from the server (e.g. by pushing the STREAM
button in Fiddler's toolbar). When that happens, the client is fed the blocks of the response as it is downloaded, and the event handler mentioned only executes after
the response has already been returned.
If you disable Streaming, it should work as you expect.
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