Issues with path params and routes ending with `/*`

[synth3]

Version

4.4.0

Context

I encountered an some problems regarding path matching with path params and routes ending with /* while writing tests for an application that uses the vertx http-server and router:

• Some requests for paths that would match without path params do not match when path params are used

Do you have a reproducer?

New router tests in #2396

Steps to reproduce

Create the following Routes

router.route("/a/:id/b/:id2/c/*").handler(rc -> {
    assertEquals("123", rc.pathParam("id"));
    assertEquals("1234", rc.pathParam("id2"));
    rc.response().end("r4");
});

router.route("/a/:id/b1/*").handler(rc -> {
    assertEquals("123", rc.pathParam("id"));
    rc.response().end("r3");
});

router.route("/a/:id/*").handler(rc -> {
    assertEquals("123", rc.pathParam("id"));
    rc.response().end("r2");
});

router.route("/:id/*").handler(rc -> {
    assertEquals("123", rc.pathParam("id"));
    rc.end("r1");
});

Test against these routes

Working:

// should call "/:id/*"
testRequest(HttpMethod.GET, "/123/foo", 200, "OK", "r1");
testRequest(HttpMethod.GET, "/123/", 200, "OK", "r1");

// should call "/a/:id/*"
testRequest(HttpMethod.GET, "/a//123/", 200, "OK", "r2");
testRequest(HttpMethod.GET, "/a/123/foo/bar", 200, "OK", "r2");

// should call "/a/:id/b1/*"
testRequest(HttpMethod.GET, "/a//123/b1/", 200, "OK", "r3");
testRequest(HttpMethod.GET, "/a/123/b1/foo", 200, "OK", "r3");

// should call "/a/:id/b/:id2/c/*"
testRequest(HttpMethod.GET, "/a//123/b/1234/c/", 200, "OK", "r4");
testRequest(HttpMethod.GET, "/a/123/b/1234/c/foo", 200, "OK", "r4");

404:

// should call "/:id/*"
testRequest(HttpMethod.GET, "/123", 200, "OK", "r1");

// should call "/a/:id/*"
testRequest(HttpMethod.GET, "/a/123", 200, "OK", "r2");
testRequest(HttpMethod.GET, "/a//123", 200, "OK", "r2");

// should call "/a/:id/b1/*"
testRequest(HttpMethod.GET, "/a/123/b1", 200, "OK", "r3");
testRequest(HttpMethod.GET, "/a//123//b1", 200, "OK", "r3");

// should call "/a/:id/b/:id2/c/*"
testRequest(HttpMethod.GET, "/a/123/b/1234/c", 200, "OK", "r4");

Wrong handler called (problem with normalization?):

// called handler of route "/a/:id/*" instead of route "/a/:id/b/:id2/c/*"
testRequest(HttpMethod.GET, "/a//123//b//1234//c", 200, "OK", "r4");

[pmlopes]

The rules are not as expected in this issue. I've updated the docs to reflect the correct rules.

[synth3]

@pmlopes Thanks alot for looking into this!

My assumtions have been based on the behavior of routes without path params and this documentation (which currently reflects that behavior):

• https://vertx.io/docs/vertx-web/java/#_routing_by_paths_that_begin_with_something
• https://vertx.io/docs/vertx-web/java/#_capturing_path_parameters

Maybe that documentation should be updated too.

The same Tests without the path params do all work (for comparability I substituted the params with the static segment noparam):

@Test
public void testPathPrefixWithoutPathParams() throws Exception {
  router.route("/a/noparam/b/noparam/c/*").handler(rc -> {
    rc.response().end("r4");
  });

  router.route("/a/noparam/b1/*").handler(rc -> {
    rc.response().end("r3");
  });

  router.route("/a/noparam/*").handler(rc -> {
    rc.response().end("r2");
  });

  router.route("/noparam/*").handler(rc -> {
    rc.end("r1");
  });

  // should call "/noparam/*"
  testRequest(HttpMethod.GET, "/noparam/foo", 200, "OK", "r1");
  testRequest(HttpMethod.GET, "/noparam/", 200, "OK", "r1");
  // should call "/a/noparam/*"
  testRequest(HttpMethod.GET, "/a//noparam/", 200, "OK", "r2");
  testRequest(HttpMethod.GET, "/a/noparam/foo/bar", 200, "OK", "r2");
  // should call "/a/noparam/b1/*"
  testRequest(HttpMethod.GET, "/a//noparam/b1/", 200, "OK", "r3");
  testRequest(HttpMethod.GET, "/a/noparam/b1/foo", 200, "OK", "r3");
  // should call "/a/noparam/b/noparam/c/*"
  testRequest(HttpMethod.GET, "/a//noparam/b/noparam/c/", 200, "OK", "r4");
  testRequest(HttpMethod.GET, "/a/noparam/b/noparam/c/foo", 200, "OK", "r4");


  // should call "/noparam/*"
  testRequest(HttpMethod.GET, "/noparam", 200, "OK", "r1");
  // should call "/a/noparam/*"
  testRequest(HttpMethod.GET, "/a/noparam", 200, "OK", "r2");
  testRequest(HttpMethod.GET, "/a//noparam", 200, "OK", "r2");
  // should call "/a/noparam/b1/*"
  testRequest(HttpMethod.GET, "/a/noparam/b1", 200, "OK", "r3");
  testRequest(HttpMethod.GET, "/a//noparam//b1", 200, "OK", "r3");
  // should call "/a/noparam/b/noparam/c/*"
  testRequest(HttpMethod.GET, "/a/noparam/b/noparam/c", 200, "OK", "r4");
  testRequest(HttpMethod.GET, "/a//noparam//b//noparam//c", 200, "OK", "r4");
}