Java GlassFish 3-400获取/发布/放置/删除时的错误请求

在我编写的脚本中，我创建了一个小而简单的REST客户端。脚本本身是一个原型，因此代码不具有“生产价值”——因此请忽略延迟捕获表达式等

有两种类型的服务器包含我从中获取数据的REST服务；野蝇8.2.0或玻璃鱼3.1.2.2。这里需要注意的是：我的REST客户端可以很好地从Wildfly服务器获取数据，但是GlassFish服务器对于任何请求都会返回HTTP 400错误请求

我可以通过web浏览器访问这两台服务器的REST服务，因此我知道它们都工作正常。我甚至可以通过一个套接字与两台服务器进行原始连接，它们用正确的数据进行响应

那么，GlassFish为什么不接受这些请求呢

插座连接（用于测试）

REST客户端代码：

import groovy.json.JsonSlurper;
import javax.xml.bind.DatatypeConverter;


/*
REST-client (a very simple one)
*/
public class RESTclient {
  public static Object get(URL url, Map<String, String> headers) {
    return http(url, "GET", null, headers);
  }
  public static Object post(URL url, String data, Map<String, String> headers) {
    return http(url, "POST", data, headers);
  }

  public static Object put(URL url, String data, Map<String, String> headers) {
    return http(url, "PUT", data, headers);
  }

  public static Object delete(URL url, String data, Map<String, String> headers) {
    return http(url, "DELETE", data, headers);
  }

  private static Object http(URL url, String method, String data, Map<String, String> headers) {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    Authenticator.setDefault(new Authenticator() {
      protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("username", "password".toCharArray());
      }
    });
    connection.setRequestMethod(method);

    for (String header : headers.keySet()) {
      connection.setRequestProperty(header, headers.get(header));
    }

    if (data != null) {
      connection.setRequestProperty("Content-Type", "application/json");
      connection.setDoOutput(true);
      OutputStream outputStream =connection.getOutputStream();
      outputStream.write(data.getBytes());
    }

    int responseCode = connection.getResponseCode();
    switch (responseCode) {
      case HttpURLConnection.HTTP_NO_CONTENT:
        // This happens when the server doesn't give back content, but all was ok.
        return (new HashMap());
      case HttpURLConnection.HTTP_OK:
        InputStream inputStream = connection.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String response = reader.readLine();

        JsonSlurper parser = new JsonSlurper();
        Object jsonResponse = parser.parseText(response); // This can be either a List or a Map
        // Close the connection
        try { connection.close(); } catch (Exception e) { /* Already closed */ }
        return jsonResponse;
      default:
        println "response code: " + responseCode;
        println connection.getResponseMessage();
        println connection.getHeaderFields();
        // Close the connection
        try { connection.close(); } catch (Exception e) { /* Already closed */ }
        return null;
    }
  }
}

---

我找到了答案！因此，如果将来有任何其他人偶然发现同样的问题，我将把它留在这里：

缺少一个Accept头，我猜服务器端只接受json内容。我没有进一步研究为什么WildFly服务器没有响应400个错误请求，但我想WildFly会尝试猜测/推断传入的数据

因此，通过添加以下内容解决了整个问题：

connection.setRequestProperty("Accept", "application/json");

---

我找到了答案！因此，如果将来有任何其他人偶然发现同样的问题，我将把它留在这里：

缺少一个Accept头，我猜服务器端只接受json内容。我没有进一步研究为什么WildFly服务器没有响应400个错误请求，但我想WildFly会尝试猜测/推断传入的数据

因此，通过添加以下内容解决了整个问题：

connection.setRequestProperty("Accept", "application/json");

response code: 400
Bad Request
[null:[HTTP/1.1 400 Bad Request], Server:[GlassFish Server Open Source Edition 3.1.2.2], Connection:[close], Set-Cookie:[rememberMe=deleteMe; Path=/; Max-Age=0; Expires=Tue, 22-Nov-2016 08:43:29 GMT, SSOcookie=2a86cf4b-a772-435a-b92e-f12845dc20a2; Path=/; HttpOnly], Content-Length:[1090], Date:[Wed, 23 Nov 2016 08:43:28 GMT], Content-Type:[text/html], X-Powered-By:[Servlet/3.0 JSP/2.2 (GlassFish Server Open Source Edition 3.1.2.2 Java/Oracle Corporation/1.7)]]
null

connection.setRequestProperty("Accept", "application/json");