code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  package org.apache.skywalking.oap.server.core.alarm;
  
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.net.URI;
  import java.net.http.HttpClient;
  import java.net.http.HttpRequest;
  import java.net.http.HttpResponse;
  import java.time.Duration;
  import java.util.Map;
  
  public abstract class HttpAlarmCallback implements AlarmCallback {
      protected String post(
              final URI uri,
              final String body,
              final Map<String, String> headers)
              throws IOException, InterruptedException {
          final var request = HttpRequest
                  .newBuilder()
                  .uri(uri)
                  .POST(HttpRequest.BodyPublishers.ofString(body))
                  .header("Content-Type", "application/json")
                  .timeout(Duration.ofSeconds(12));
          headers.forEach(request::header);
  
          final var response = HttpClient
                  .newBuilder()
                  .followRedirects(HttpClient.Redirect.NORMAL)
                  .build()
                  .send(request.build(), HttpResponse.BodyHandlers.ofString());
  
          final var status = response.statusCode();
          if (status != 200 && status != 204) {
              final var logger = LoggerFactory.getLogger(getClass());
              logger.error(
                      "send to {} failure. Response code: {}, Response content: {}",
                      uri, status, response.body()
              );
          }
          return response.body();
      }
  }
  