I mostly find the readability the same, except for acronyms in the middle. RemoteHTTPIPAddr vs remote_http_ip_addr. I prefer the latter, but my go-to language these days encourages the former.
I work in telecoms where there are so many acronyms that snakeCase is really painful (but we still use it).
As for your second example, why not remote_HTTP_IP_addr ?
Even more readable IMHO.