public static ProxyConfig haproxy(InetSocketAddress proxyAddress) {
        requireNonNull(proxyAddress, "proxyAddress");
        return new HAProxyConfig(proxyAddress);
    }
Creates a {@link ProxyConfig} configuration for HAProxy protocol. The {@code sourceAddress} will
be inferred from either the {@link ServiceRequestContext} or the local connection address.

@param proxyAddress the proxy address
core/src/main/java/com/linecorp/armeria/client/proxy/ProxyConfig.java