public final H2AsyncClientBuilder setConnectionConfigResolver(final Resolver<HttpHost, ConnectionConfig> connectionConfigResolver) {
        this.connectionConfigResolver = connectionConfigResolver;
        return this;
    }
Sets {@link Resolver} for {@link ConnectionConfig} on a per host basis.

@return this instance.
@since 5.2
httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java