https://bz.apache.org/bugzilla/show_bug.cgi?id=66842
Bug ID: 66842
Summary: Http2AsyncUpgradeHandler does not update overhead
count based on sent frames
Product: Tomcat 9
Version: 9.0.76
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Connectors
Assignee: dev@tomcat.apache.org
Reporter: ajmurphy...@gmail.com
Target Milestone: -----
Encountered while testing configurations for
https://bz.apache.org/bugzilla/show_bug.cgi?id=66841
<Connector port="8443" protocol="org.apache.coyote.http11.Http11Nio2Protocol"
connectionTimeout="20000" maxThreads="150"
SSLEnabled="true" scheme="https" secure="true" useAsyncIO="true"
>
<UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
<SSLHostConfig>
<Certificate
certificateKeystoreFile="conf/certs/devkeystore"
type="RSA"/>
</SSLHostConfig>
</Connector>
Given an application using Spring server sent event emitters to send
notifications to logged in users and the application sends heartbeat messages
through those SSE emitters to test they are still active. If using a connector
config similar to above (HTTP 2 upgrade and useAsyncIO true) then the data
frames of the heartbeat message will not reduce the overhead count but the
WINDOW_UPDATE frames received in acknowledgement will increase the overhead
count. This causes the overhead count to be exceeded within just a few
heartbeat cycles.
To reproduce:
1. Use NIO2 protocol with Http2Protocol upgrade and useAsyncIO true
2. deploy application with endpoint to create event stream that the application
sends messages on continuously from separate thread
3. Access endpoint from browser (I used chrome but assume it occurs with other
browsers)
4. wait
After each message sent on the event stream a WINDOW_UPDATE frame will be
received which increases the overhead count. Without the data frames of the
sent messages lowering the overhead count the connection will quickly be closed
due to overhead count exceeded.
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