hack to get around HttpURLConnection deficiency

RESTBase.java

				OutputStream os = null;
				if (call.getRequestType() == Call.RequestType.DELETE) {
					try {
						Object httpImpl = conn;
						Class<?> httpImplClass = httpImpl.getClass();
						if (conn instanceof HttpsURLConnection) {
							Field delegateField = conn.getClass().getDeclaredField("delegate");
							delegateField.setAccessible(true);
							httpImpl = delegateField.get(conn);
							httpImplClass = httpImpl.getClass().getSuperclass();
						}
							
						Field engineField = httpImplClass.getDeclaredField("httpEngine");
						Field requestMethodField = HttpURLConnection.class.getDeclaredField("method");
						Field rawRequestHeadersField = httpImplClass.getDeclaredField("rawRequestHeaders");
						engineField.setAccessible(true);
						requestMethodField.setAccessible(true);
						rawRequestHeadersField.setAccessible(true);
						for (Method method : httpImpl.getClass().getDeclaredMethods()) {
							if (method.getName().contentEquals("newHttpEngine")) {
								method.setAccessible(true);
								Object engine = method.invoke(httpImpl, requestMethodField.get(httpImpl),
																		rawRequestHeadersField.get(httpImpl),
																		null,
																		null);
								engineField.set(httpImpl, engine);
								
								Class<?> httpEngineClass = engine.getClass();
								if (conn instanceof HttpsURLConnection)
									httpEngineClass = httpEngineClass.getSuperclass();
								
								conn.connect(); 
								
								Method initRequestBodyOut = httpEngineClass.getDeclaredMethod("initRequestBodyOut");
								initRequestBodyOut.setAccessible(true);
								initRequestBodyOut.invoke(engine);
								
								Method getRequestBody = httpEngineClass.getDeclaredMethod("getRequestBody");
								os = (OutputStream)getRequestBody.invoke(engine);
							}
						}
					} catch (Exception ignored) { }
				} 

				if (os == null)
					os = conn.getOutputStream();