Hi, Looking at previous Servlet 4.0 EG e-mails [1] and the PushBuilder.push() API [2], it seems the current version returns true if the PUSH_PROMISE frame + headers were sent, meaning the client can still reset that stream and refuse to receive the response that goes with it.
Now looking at former EG e-mails, it seems that a previous version of the spec stated that push "returns immediately without blocking" [3]. But this API, and the implementation as far as I understand things [4], seems synchronous. Or does that writing does not happen directly on the actual socket but is later dispatched on another thread? In general, I'm trying to understand how I can use that API in an async, non-blocking way and if the application really needs to know if the Push promise "happened" or not... Cheers, [1] https://java.net/projects/servlet-spec/lists/jsr369- experts/archive/2016-03/message/0 [2] https://github.com/apache/tomcat/blob/trunk/java/javax/s ervlet/http/PushBuilder.java#L161-L178 [3] https://java.net/projects/servlet-spec/lists/jsr369-expe rts/archive/2015-12/message/8 [4] https://github.com/apache/tomcat/blob/trunk/java/org/apa che/coyote/http2/Http2UpgradeHandler.java#L1036 -- Brian Clozel
