Option to deactivate apiHost validation, to allow forwarding to localhost

We are using ReactorCloudFoundryClient to connect to the CF-API.

Version used:

    <dependency>
      <groupId>org.cloudfoundry</groupId>
      <artifactId>cloudfoundry-client-reactor</artifactId>
      <version>5.6.0.RELEASE</version>
    </dependency>

We provide this class with its connection context by building an instance of DefaultConnectionContext:

private DefaultConnectionContext getDefaultConnectionContext() {
    return DefaultConnectionContext.builder()
        .apiHost(config.getApiEndpoint())
        .build();
  }

As you can see, the builder reads the property apiHost from our app-config.

The CF-ApiEndpoint we want to connect to changes depending on the current target-environment. The application that implements ReactorCloudFoundryClient doesn't know about this environment though.
Instead, we send all http-traffic to a second, locally running application which knows about the current target environment.

For the above mentioned use-case, we have to set apiHost to localhost:4201, so the traffic is forwarded to our second, environment-aware application.

Using this setup, the following exception occurs upon building the DefaultConnectionContext instance:
IllegalArgumentException: "API hostname http://localhost:4201 is not correctly formatted (e.g. 'api.local.pcfdev.io')"

Looking at the call-stack, it seems like this method checkForValidApiHost() in AbstractRootProvider is causing the issue for us:

    @Check
    public final void checkForValidApiHost() {
        Matcher matcher = HOSTNAME_PATTERN.matcher(this.getApiHost());
        if (!matcher.matches()) {
            throw new IllegalArgumentException(String.format("API hostname %s is not correctly formatted (e.g. 'api.local.pcfdev.io')", this.getApiHost()));
        }
    }

We already considered multiple options to workaround this limitation in the apiHost-string-syntax, but so far we couldn't find any working solution sadly..
Do you guys maybe know a way to get around this validation-step of the apiHost property? Or is there any chance that we can disable this validation if needed, maybe through an additional building-param?

Thanks already for any help about this matter!

Inizia da AbstractRootProvider.checkForValidApiHost() e segui il modo in cui DefaultConnectionContext.builder() fornisce apiHost. Determina come rendere facoltativa la convalida mantenendo il comportamento predefinito esistente, quindi verifica che localhost:4201 possa essere accettato per l'inoltro senza l'attuale IllegalArgumentException.