[edm0nd]

I loaded up Windows 98SE SP2 in a VM and tried to use it to browse the modern web but it was basically impossible since it only supported HTTP/1.1 websites. I was only able to find maybe 3-4 websites that still supported it and load.

[ronsor]

I would expect your main problem to be SSL/TLS. As far as I know, even modern web servers have no problem serving content to HTTP/1.0 clients.

[JdeBP]

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.

* 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.

[karel-3d]

I tried old macOS ... sorry, Mac OS ... and yeah the main problem was SSL/TLS. HTTP/1.0 was fine but the SSL crypto algorithm negotiation never went through.

[anthk]

Try Retrozilla

https://portal.mozz.us/gopher/gopher.somnolescent.net/9/w2kr...

with these NEW values in about:config set to true:

    security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256
    security.ssl3.ecdhe_rsa_aes_128_gcm_sha256

Also, set these to false:

    security.ssl3.ecdh_ecdsa_rc4_128_sha
    security.ssl3.ecdh_rsa_rc4_128_sha
    security.ssl3.ecdhe_ecdsa_rc4_128_sha
    security.ssl3.ecdhe_rsa_rc4_128_sha
    security.ssl3.rsa_rc4_128_md5
    security.ssl3.rsa_rc4_128_sha