Vertx reverse proxy redirect handling - redirect

Question

I'm pretty new to Vertx, I'm building a reverse proxy on Quarkus.
I need to handle a redirect response from my Apache to my Quarkus reverse proxy, so that my Client doesn't get redirected directly to the Apache server (bypassing the proxy).
Resource is located in custom.url/myResource/index.php
My reverse proxy is running on localhost:8080
Basically what happens is:
Browser sends a GET request on localhost:8080/myResource, Quarkus is listening on 8080 so he receives the request, remaps the url tocustom.url/myResource and forwards to Apache.
Apache creates a redirect response, because a slash was missing at the end of the url, so he sends a 301 response with the Location header set to custom.url/myResource/ (with slash at the end) to the Quarkus reverse proxy.
Quarkus will forward the redirect response (301 custom.url/myResource/) to the Client, so he will make a GET call straight to custom.url/myResource/ bypassing the Reverse Proxy.
This behavior is not acceptable, since I can't allow the client to know the resource address of my backend service.
Code snippet
Route route = this.proxyRouter.route(method, path)
.handler(CorsHandler.create("*"))
.handler(LoggerHandler.create())
.handler(ctx ->{ //need to create an handler to handle this behaviour })
.handler(ProxyHandler.create(myProxy);
What i have to do is basically setting the Location header of the response to the correct path, including the slash.
I tried to get the request.absoluteURI() hostname, the response subdomain (with the slash) and merge them together.
request URI: localhost:8080/myResource -> localhost:8080 (1)
response Location: custom.url/myResource/ -> /myResource/ (2)
So i get the wanted Location header merging (1) and (2): localhost:8080/myResource/
Logically this works, but I don't know where and if I'm able to do this inside the handler, or if I need to do it some other way. I tried to implement this logic inside the handler, but I'm only able to get the request URI, there was no way to find the 301 response.
Need help plz.