+### X·H·T·M·L responses
+
+These responses **must** be served with a `Content-Type` of
+ `application/xhtml+xml` (or equivalent).
+Note that these paths **do not** have a trailing slash.
+
+ + **`GET /$IRI`** (where `$IRI` contains a colon and no slash):
+ Serve the file at `/.lookup.xhtml`.
+ This can be used to look up statuses by their identifier.
+