Fiddleはjavaプログラムのhttp要求を監視する

System.setProperty("http.proxyHost", "127.0.0.1");
System.setProperty("https.proxyHost", "127.0.0.1");
System.setProperty("http.proxyPort", "8888");
System.setProperty("https.proxyPort", "8888");

HttpClient client = HttpClientBuilder.create().setProxy( new HttpHost("127.0.0.1", 8888)).build();