vertx how to reroute with query params - vert.x

Question

Due to some url versioning, we try to map multiple paths to the same handler.
I tried to achieve this via rerouting but the query parameters get lost in the process.
// reroute if the path contains apiv3 / api v3
router.route("/apiv3/*").handler( context -> {
String path = context.request().path();
path = path.replace("apiv3/", "");
LOG.info("Path changed to {}", path);
context.reroute(path);
});
What is the most elegant way around this problem?
There are some discussions on google groups but surprisingly nothing quick and simple to implement.

Answer 1

The reroute documentation says:
It should be clear that reroute works on paths, so if you need to
preserve and or add state across reroutes, one should use the
RoutingContext object.
So you could create a global catch-all route that stores any query param in the RoutingContext:
router.route().handler(ctx -> {
ctx.put("queryParams", ctx.queryParams());
ctx.next();
});
Then your apiv3 catch-all route:
router.route("/apiv3/*").handler( context -> {
String path = context.request().path();
path = path.replace("apiv3/", "");
LOG.info("Path changed to {}", path);
context.reroute(path);
});
Finally an actual route handler:
router.get("/products").handler(rc -> {
MultiMap queryParams = rc.get("queryParams");
// handle request
});