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A comment on A Technology Preview of Nginx Support for QUIC and HTTP/3. Parent comment

Re:A Technology Preview of Nginx Support for QUIC and HTTP/3 by folmar on Saturday June 20, 2020 @05:56PM (#23587683)
> You're describing how it can be upgraded in theory but the parent was explaining that it can't be done in practice.

Adding features to TCP was done many times successfully already. When my jurney started there was no ws-scaling, ECN, SACK... They are all widely adopted now.

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Re:A Technology Preview of Nginx Support for QUIC and HTTP/3 by tialaramex on Sunday June 21, 2020 @09:05AM (#23591798)
Ten years after it was standardised, field reports showed ECN at 0.06% of all connections using ECN while almost 40% showed countermeasures preventing ECN or other failures (the remainder did not attempt ECN)

So what did they do? Well they adjusted ECN so that it tolerates the broken middleboxes. That's what you have today. Your systems go "Oh, ECN is broken, oh well" and press on without it. You see this as a feature added "successfully" and I call it what it is: Failure.

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