There is a problem in 1.4.0.M3 and 1.4.0.BUILD-SNAPSHOT, Jetty, EventSource (SseEmitter) and CORS. With this setup spring boot sends a wrong Content-Type response header back to the client.
Server-Sent Events is a technology to send text messages only from a server to clients in browser-based web applications. Server-Sent Events is based on persistent connections in the HTTP protocol.
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