In theory, yes, although there are some fairly big stones falling in the avalanche of turning off HTTP/0.9 and HTTP/1.0 at the server end.
In practice, it's going to be tricky to know without measurement; and the shifting of the default at the client end to from 0.9 and 1.0 to 1.1 began back in 2010. Asking the people who run robots for statistics will not help. Almost no good actor robots are using 0.9 and 1.0 now, and 0.9 and 1.0 traffic dropped off a cliff in the 2010s falling to 0% (to apparently 1 decimal place) by 2021 as measured by the Web Almanac.
If a modern HTTP server stopped serving 0.9 and 1.0, or even just had a problem doing so to decades-old pre-1.1 client softwares, very few people would know. Almost 0% of HTTP client traffic would be affected.
And, indeed, http://url.town/ is one of the very places that has already turned 0.9 off. It does not speak it, and returns a 1.1 error response. And no-one in this thread (apart from edm0nd) knew.
In practice, it's going to be tricky to know without measurement; and the shifting of the default at the client end to from 0.9 and 1.0 to 1.1 began back in 2010. Asking the people who run robots for statistics will not help. Almost no good actor robots are using 0.9 and 1.0 now, and 0.9 and 1.0 traffic dropped off a cliff in the 2010s falling to 0% (to apparently 1 decimal place) by 2021 as measured by the Web Almanac.
* https://almanac.httparchive.org/en/2021/http
If a modern HTTP server stopped serving 0.9 and 1.0, or even just had a problem doing so to decades-old pre-1.1 client softwares, very few people would know. Almost 0% of HTTP client traffic would be affected.
And, indeed, http://url.town/ is one of the very places that has already turned 0.9 off. It does not speak it, and returns a 1.1 error response. And no-one in this thread (apart from edm0nd) knew.