Java okHttp重用保活连接

Question

如何通过 okHttp 重用 http keep-alive 连接？

我的代码示例：

public class MainWithOkHttp {

    static OkHttpClient _client = new OkHttpClient();

    public static void main(String[] args) {
        ...
        query1();
        ...
        // in this request
        Request _request = new Request.Builder()
            .url("...")
            .addHeader("connection", "keep-alive")
            .addHeader("cookie", _cookie)
            .post(postParams)
            .build();
        // in this request my previous session is closed, why?
        // my previous session = session created in query1 method
        Response _response = _client.newCall(_request).execute();
        ...
    }

    ...
    private static void query1() {
        ...
        Request request = new Request.Builder()
            .url("...")
            .addHeader("connection", "keep-alive")
            .addHeader("cookie", _cookie)
            .get()
            .build();
        Response _response = _client.newCall(request).execute();
        ...
    }
    ...

}

所以，我正在调用 query1() 方法。在此方法中打开连接，在服务器端创建会话并接收带有 sessionId 的 cookie。

但是，当我对服务器执行另一个查询时 - 我之前的连接未被使用并且服务器上的会话已经关闭。服务器中的会话生命周期不短，所以问题不在生命周期。

PS: 我正在从服务器获取验证码并识别验证码，然后使用验证码向服务器执行查询。但是服务器端的验证码无法识别，因为会话已经关闭并且验证码存储在会话中。

Answer 1

最终，以下代码对我有用：

public class Main {

  static OkHttpClient _client = new OkHttpClient();

  public static void main(String[] args) throws IOException {
      performQuery();
  }

  private static void performQuery() throws IOException {
      Request firstRequest = new Request.Builder()
            .url("http://localhost/test/index.php")
            .get()
            .build();
      Response firstResponse = _client.newCall(firstRequest).execute();

      Request.Builder requestBuilder = new Request.Builder()
            .url("http://localhost/test/index.php");

      Headers headers = firstResponse.headers();

      requestBuilder = requestBuilder.addHeader("Cookie", headers.get("Set-Cookie"));

      Request secondRequest = requestBuilder.get().build();
      Response secondResponse = _client.newCall(secondRequest).execute();
  }
}

看来，问题出在 _cookie 对象上。

Java okHttp重用保活连接

Java okHttp reuse keep-alive connection

java

session

keep-alive

okhttp

session-reuse