增加PluginErrorHandler

discovery-plugin-framework/src/main/java/com/nepxion/discovery/plugin/framework/context/PluginErrorHandler.java

+package com.nepxion.discovery.plugin.framework.context;
+
+/**
+ * <p>Title: Nepxion Discovery</p>
+ * <p>Description: Nepxion Discovery</p>
+ * <p>Copyright: Copyright (c) 2017-2050</p>
+ * <p>Company: Nepxion</p>
+ * @author Haojun Ren
+ * @version 1.0
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.apache.commons.io.IOUtils;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.web.client.DefaultResponseErrorHandler;
+
+public class PluginErrorHandler extends DefaultResponseErrorHandler {
+    private String cause;
+
+    @Override
+    public void handleError(ClientHttpResponse response) throws IOException {
+        // 这里绝对不能关闭InputStream
+        InputStream inputStream = response.getBody();
+        cause = IOUtils.toString(inputStream, "UTF-8");
+    }
+
+    public String getCause() {
+        return cause;
+    }
+}
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