ResponseBodyEmitter doesn't get headers written immediately [SPR-13341]

[spring-projects-issues]

Kenzie Togami opened SPR-13341 and commented

When returning a ReponseBodyEmitter from a controller method, the headers for the connection are not written to the stream until something is emitted. If nothing is emitted, clients timeout and think the server is unavalible.

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Affects: 4.2 GA

Referenced from: commits f5210ce

[spring-projects-issues]

Rossen Stoyanchev commented

Odd, it's not what I would expect. The ResponseBodyEmitterReturnValueHandler is invoked immediately after the controller method returns and calls getBody on ServerHttpResponse in order to commit the response. Could you provide some more details on how to reproduce the behavior you're seeing?

[spring-projects-issues]

Kenzie Togami commented

Run the code in this repo with ./;gradlew jettyEclipseRun and use curl to test http://localhost:4000/sse and http://localhost:4000/sse-send. You should be able to see the bug happening.

[spring-projects-issues]

Rossen Stoyanchev commented

Okay it appears that accessing the response OutputStream is insufficient to commit the response.