undertow path template and resource handler

Question

I'm using a ResourceHandler to provide javascript files when I go on my web server. The thing is now I would like to provide the exact same javascript but accepting /{id} in my url so I can use the {id} when my website does POST request inside the handleRequest method. I tried with a pathTemplate but when I try to access my website it says that it can't find one of my js files (it works if I do not use the pathTemplate).

What can I do to make it works?

Answer 1

You can define two routes, one for your controller (to receive the post data) and one for serving your exact javascript file.

A more standard solution is to have a route dedicated to serve all the assets (including your javascript app). For this, look at the following answer: Routing template format for undertow

Undertow.builder().addHttpListener(8080, "0.0.0.0")
  .setHandler(Handlers.path()

    // Controllers
    .addPrefixPath("/controller", Handlers.routing()
        .post("/{id}", exchange -> {
          String id = exchange.getQueryParameters().get("id").getFirst();
        }))

    // Serve your file, preserving any route information
    .addPrefixPath("/app.js",  exchange -> {
        Path p = Paths.get("/path/to/app.js");
        exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "application/javascript");
        exchange.getResponseSender().send(
          ByteBuffer.wrap(Files.readAllBytes(p))
      )})
).build().start();

With this example, your controller will be available at the route /controller/{id} and your javascript file will be served directly.

Note that this way of serving file is not optimal, it works if files are not too large. For a better way of serving files, one can play with Undertow's PathResource and PathResourceManager classes.