Is it possible to call bidi/vhosts-model without knowing the host name?

Yes. Specify a wildcard, see bidi's README

If I try this:

(vhosts-model [:*
                                        ["/index.html" :index]
                                        ["login" :login]])

I get: ExceptionInfo Error in server model: [[(named (not (sequential? :*)) "Virtual host") nil nil]]

Does it need to be (vhosts-model [[:*] ...])

ExceptionInfo Error in server model: [[(named [(not (map? :*))] "Virtual host") nil nil]]

which I think might be the same error

I’ve been through a few iterations of randomly re-arranging square brackets, but it feels like a mug’s game.

I hadn't actually looked at the readme, what you did should have worked. ¯\(ツ)/¯

All I can suggest is that you might be on an old version of bidi, or an old one is getting linked - can you try lein deps :tree to make sure you've got bidi 2.0.12

@peterwestmacott sorry for your frustration, the wildcard feature is recent so there might be a bug but I've retested on my system and all seems ok

I hoping clojure.spec will make these errors a little less arduous

Once you're sure you're on the latest bidi, send me a bit more code with context and I'll try it here

definitely 2.0.12

I’ll try and come up with a minimal test case

okay, so I ran lein new test-bidi to create a new project, modified the dependencies in the project.clj file to be:

:dependencies [[org.clojure/clojure "1.8.0"]
                 [bidi "2.0.12”]]

fired up a REPL in cursive and ran

(require '[bidi.vhosts :refer [vhosts-model]])

(vhosts-model
  [:*
   ["/index.html" :index]
   ["/login" :login]])

and got: ExceptionInfo Error in server model: [[(named (not (sequential? :*)) "Virtual host") nil nil]] clojure.core/ex-info (core.clj:4617)

I should maybe add that I can inject the server name through an environment variable if I need to. So there is definitely a workaround here.