On 06/05/2021 13:33, Christopher Schultz wrote:
Leon,
On 5/6/21 06:25, Leon Atherton wrote:
We are seeing that Firefox triggers the HTTP2 overhead protection with
multipart file uploads. About 1MB is uploaded before overhead
protection is triggered. I believe a few weeks ago Chrome was
triggering this too, but it looks like a recent update may have
resolved it.
This is on Tomcat 9.0.45 (though it applies to earlier versions too)
using the org.apache.coyote.http11.Http11NioProtocol connector with
upgrade to org.apache.coyote.http2.Http2Protocol.
With http2 debug logging enabled, there are occasional Payload size
[1] interspersed between larger payloads, though it appears to be a
couple of back-to-back Payload size [1]'s which may be triggering the
org.apache.coyote.http2.ConnectionException: Connection [0], Too much
overhead so the connection will be closed.
I've found earlier Tomcat conversations which seem to indicate it's a
client issue. I've searched through the Firefox bug tracker but have
not found anything that looks like this (feels like looking for a
needle in a haystack).
Is this a known issue in Tomcat or Firefox? It can be resolved by
disabling the protection or potentially just tweaking the config
values, but if it's a known Firefox issue I'd like to know if
something has been raised on their bug tracker I can follow?
Nothing in the tracker that I know of off-hand, but there is this
informative answer on SO by markt which may help you a little:
https://stackoverflow.com/a/61454503/276232
Using the information in that answer may allow you to reconfigure your
server to allow Firefox's behavior.
It's probably worth us taking some time to adapt markt's SO answer there
into a whole section on "Protocol Abuse and Protection Features" in the
HTTP/2 configuration guide.
There is an open issue for Chrome:
https://bugs.chromium.org/p/chromium/issues/detail?id=1000809
but there hasn't been much movement.
I'll add something to my TODO list to see what can be done to avoid
false positives like this as it looks like short sequences of small
packets can occur depending on how the client buffers data.
Mark
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