/**
 * The Network Proxy interface
 */
public interface NetworkProxy{
    /**
     * 
     *
     * Note: for Android it is a synchronous SPI
     * @param httpProxyRequestInfo    the request, the network proxy information, to be sent by Issuing Participants
     * @return httpProxyResponseInfo  the Issuing Participant needs to convert the data body of the response to HttpProxyResponseInfo object. Otherwise, if the request fails, null is returned.
     * @throws IOException
     */
    @Nullable
    HttpProxyResponseInfo sendProxyRequest(@NonNull HttpProxyRequestInfo httpRequestInfo) throws IOException;
}

InitConfig initConfig = new InitConfig();
        initConfig.registerNetworkProxy(ProxyScene.PROXY_SCENE_AC, new NetworkProxy() {
            @Override
            public HttpProxyResponseInfo sendHttpRequest(HttpProxyRequestInfo httpProxyRequestInfo) {
                //this is a sample code for how to use proxy network
                HttpURLConnection connection = null;
                URL url = null;
                try {
                    url = new URL("hostUrl");
                    connection = (HttpURLConnection) url.openConnection();
                    if (connection.getResponseCode() == 200) {//if http request success,then we fetch body from response,and assemble a httpProxyResponseInfo
                        HttpProxyResponseInfo httpProxyResponseInfo = new HttpProxyResponseInfo();
                        httpProxyRequestInfo.setxxx();   //the setxxx function is to configure fields/properties of the request data body
                        return httpProxyResponseInfo;
                    } else {
                        return null;    //if http request fails, return null.
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    return null;
                }
                return null;
            }
        });