android https验证怎样携带证书

final request.builder builder = new request.builder().url(url);
builder.addheader(key,value);  //将请求头以键值对形式添加，可添加多个请求头
final request request = builder.build();
final okhttpclient client = new okhttpclient.builder()
.readtimeout(30, timeunit.seconds)
.connecttimeout(10, timeunit.seconds)
.writetimeout(60, timeunit.seconds)
.build(); //设置各种超时时间
final call call = client.newcall(request);
new thread(new runnable() {
@override
public void run() {
try {
response response = call.execute(); 
if (response != null) {

} else {

}
} catch (ioexception e) {
e.printstacktrace();
}
}
}).start();