* OPDS: Don't save an empty username.
That causes LuaSockets to try Basic auth, which is useless (and may or may not be problematic for some servers).
* Attempt to explicitly request non-compressed content.
Some servers may still refuse to obey, though.
They're breaking RFC2616 (a.k.a. HTTP/1.1) by doing so, though, meh.
* Let LuaSocket do its job.
It already handles setting up the Host header, as well as Basic authentication if both username & password are set.
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