Erlang Cowboy中的冒号

Question

I am using leptus , which is based on Cowboy , as a RESTful server. I have a problem with router.

In my code:

post("/restconf/operations/nm-restful:create-mp", Req, State) ->
    {200, {json, <<>>, State}.

In Cowboy, when there is a colon, it will do binding. But what if there is actually a colon in the URL path? I don't want it be bound. There's no information on this issue in the official website tutorial.

Answer 1

I looked at the source of cowboy_router (which leptus uses) and I don't think this is possible. I can't see any way to "escape" a colon in the source. If that's true, your best bet would be to match all such routes using /restconf/operations/:anything and then do a case on the value of the parameter anything inside the function. Here's an example:

post("/restconf/operations/:thing", Req, State) ->
  case leptus_req:param(Req, thing) of
    <<"nm-restful:create-mp">> ->
      {200, {json, <<>>, State};
    _ ->
      {404, {json, <<>>, State}.