code: @Nullable
  	public static ProxyProvider findProxySupport(Bootstrap b) {
  		ProxyProvider.DeferredProxySupport proxy =
  				BootstrapHandlers.findConfiguration(ProxyProvider.DeferredProxySupport.class, b.config().handler());
  
  		if (proxy == null) {
  			return null;
  		}
  		return proxy.proxyProvider;
  	}
docs: Find Proxy support in the given client bootstrap
  
  @param b a bootstrap to search
  
  @return any {@link ProxyProvider} found or null