Hi @Nuno
Currently, Azure API Management doesn’t support Server-Sent events.
In the scenario where you want to expose an API that produces streaming responses either the option will be using a socket or Server-Sent events based on a different scenario.
I do see feedback for WebSockets and this feedback is under review. Please feel free to raise a feature request on UserVoice to support Server-Sent events, if this is something that you would want to see in APIM.