Question

在我的脚本中，我创建了一个小而简单的REST客户端。脚本本身就是一个原型，因此代码不具备生产价值。 - 所以忽略懒惰的表达式等等。

有两种类型的服务器包含我从中获取数据的REST服务; WildFly 8.2.0或GlassFish 3.1.2.2。这里的问题是：我的REST客户端适用于从Wildfly服务器获取数据，但GlassFish服务器为任何请求返回 HTTP 400错误请求。

我可以通过网络浏览器访问两台服务器的REST服务，所以我知道它们都正常工作。我甚至可以通过两个服务器的套接字进行原始连接，并使用正确的数据进行响应。

那么，GlassFish不接受请求的原因是什么？

套接字连接（用于测试）

import java.net.Socket;

Socket s = new Socket("localhost", 8080);
String t = "GET /rest/appointment/appointments/search/?fromDate=2016-11-21&branchId=3 HTTP/1.1\nhost: localhost:8080\nAuthorization: Basic base64encodedUsername:PasswordHere\n\n"
OutputStream out = s.getOutputStream();
out.write(t.getBytes());

InputStream inn = s.getInputStream();
Scanner scan = new Scanner(inn);
String line;
while ((line = scan.nextLine()) != null) {
    println line;
}
s.close();

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;
    }
  }
}

用法：

URL appointmentSearchURL = new URL("http://localhost:8080/rest/appointment/appointments/search/?fromDate=2016-11-21&branchId=3");
Object response = RESTclient.get(appointmentSearchURL, new HashMap<String, String>());
println response;

打印出来的所有内容：

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

Answer 1

我找到了答案！所以，如果将来有任何其他问题绊倒在同一个问题上，我会留在这里：

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

所以通过添加以下内容解决了整个问题：

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

GlassFish 3 - 400 GET / POST / PUT / DELETE请求错误

1 个答案: