These work:
In the terminal:
$ curl -v http://t66y.com/thread0806.php?fid=16
In ruby:
require 'open-uri'
response = open("http://t66y.com/thread0806.php?fid=16")
html = response.read
From the curl response I can see the headers and that the content-length is missing and the charset is Chinese. This might be tripping up the ruby net http library if you're on an older version of ruby.
You can easily swap in open-uri to get the html as shown above.