RFC 9110是否有效地过时RFC 1945？
Although I'm aware that RFC 1945 is categorized as informational - and therefore is not in the standards track, it seems that RFC 9110 would effectively obsolete RFC 1945 if the latter was an internet standard.
In other words, why would someone that already read RFC 9110 and is not interested in the history of the internet need to read RFC 1945?
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我怀疑您是正确的，如果RFC 1945是标准的，RFC 9110将会淘汰它。也就是说，HTTP/1.0（1945）不是标准轨道文件。作为信息规范，它描述了已经存在的协议，而IETF没有更改控制。在某种程度上，协议仍然存在，RFC 1945仍然准确地描述了它。
HTTP/1.1 IS 在IETF的控制下，RFC 9112是该规范的最新迭代，这绝对仍在使用中。
I suspect you're correct that if RFC 1945 had been a Standard, RFC 9110 would have obsoleted it. That said, HTTP/1.0 (1945) was not a standards-track document. As an informational spec, it was describing a protocol that already existed, over which the IETF did not have change control. To the extent that protocol still exists, RFC 1945 still accurately describes it.
HTTP/1.1 is under the control of the IETF, and RFC 9112 is the most recent iteration of that specification, which is decidedly still in use.