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+cowboy_router
+=============
+
+The `cowboy_router` middleware maps the requested host and
+path to the handler to be used for processing the request.
+It uses the dispatch rules compiled from the routes given
+to the `compile/1` function for this purpose. It adds the
+handler name and options to the environment as the values
+`handler` and `handler_opts` respectively.
+
+Environment input:
+ *  dispatch = dispatch_rules()
+
+Environment output:
+ *  handler = module()
+ *  handler_opts = any()
+
+Types
+-----
+
+### bindings() = [{atom(), binary()}]
+
+> List of bindings found during routing.
+
+### constraints() = [IntConstraint | FunConstraint]
+
+> Types:
+>  *  IntConstraint = {atom(), int}
+>  *  FunConstraint = {atom(), function, Fun}
+>  *  Fun = fun((binary()) -> true | {true, any()} | false)
+>
+> List of constraints to apply to the bindings.
+>
+> The int constraint will convert the binding to an integer.
+> The fun constraint allows writing custom code for checking
+> the bindings. Returning a new value from that fun allows
+> replacing the current binding with a new value.
+
+### dispatch_rules() - opaque to the user
+
+> Rules for dispatching request used by Cowboy.
+
+### routes() = [{Host, Paths} | {Host, constraints(), Paths}]
+
+> Types:
+>  *  Host = Path = '_' | iodata()
+>  *  Paths = [{Path, Handler, Opts} | {Path, constraints(), Handler, Opts}]
+>  *  Handler = module()
+>  *  Opts = any()
+>
+> Human readable list of routes mapping hosts and paths to handlers.
+>
+> The syntax for routes is defined in the user guide.
+
+### tokens() = [binary()]
+
+> List of host_info and path_info tokens found during routing.
+
+Exports
+-------
+
+### compile(Routes) -> Dispatch
+
+> Types:
+>  *  Routes = routes()
+>  *  Dispatch = dispatch_rules()
+>
+> Compile the routes for use by Cowboy.