Ryo Okubo created TS-4087:
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Summary: H2 flexible resource limitation
Key: TS-4087
URL: https://issues.apache.org/jira/browse/TS-4087
Project: Traffic Server
Issue Type: New Feature
Components: HTTP/2
Reporter: Ryo Okubo
Current H2 implementation depends on FetchSM and PluginVC to forward requests.
But their memory footprint is very high. It may be vulnerable to DoS attack.
As simple ways to avoid the problem, we can use two limitations,
_proxy.config.net.connections_throttle_ and
_proxy.config.http2.max_concurrent_streams_in_. But reducing number of
_proxy.config.net.connections_throttle_ causes that number of acceptable
HTTP/1.1 requests become lower. And reducing
_proxy.config.http2.max_concurrent_streams_in_ restricts benefits of H2.
I'd like to propose more flexible resource limitation for current H2 impl based
on number of active H2 streams. Its adding an upper limit of active H2 streams.
If tis exceeded, ATS send low number of SETTINGS_MAX_CONCURRENT_STREAMS to
clients and/or RST_STREAM frame.
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