SseEventInputImpl wrongly split the event from stream

SseEventInputImpl reads the stream below to one event instead of 3 events:
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HTTP/1.1 200 OK
Date: Tue, 13 Oct 2020 09:36:12 GMT
Content-Type: text/event-stream; charset=UTF-8
Connection: close
Server: Jetty(9.2.28.v20190418)

data: foo

data: bar

data: baz
 
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