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In a few places we relied on "localhost" as a default if a URL's host was not set, but I think it's better to error out in these cases.
In general, there are a few places in Unit that assumed there is a host as part of the URL. I've made that explicit by doing a check at the beginning of
connect()
. I've also tried to plumb through the semantics of "host is always present" by changing the parameter types of some of the functions that use the hostname.I considered a more thorough way to express this with types - for instance implementing an
HttpUrl
struct that embeds aUrl
, and exports most of the same methods, but guarantees that host is always present. However, that was more invasive than this so I did a smaller change to start.