Question

我目前正在编写一个API，它需要从服务器A到自身建立HTTPS连接。使用Jmeter进行测试，我发现即使同时启动10个线程，线程也很容易挂起。但是，如果连接到不同的服务器，则问题不存在。我只用了几行代码来测试它。它提出了同样的问题。

try {
        URL url = new URL("some URL that connects to the server itself");
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setConnectTimeout(20000);
        con.setReadTimeout(30000);
        con.setRequestMethod("GET");
        con.setDoInput(true);
        BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String line = reader.readLine();
        int count = 0;
        while (line != null) {
            count += line.length();
           line = reader.readLine();
        }
        //con.disconnect();
      }catch(Exception e){
          e.printStackTrace();
      }

在10个线程中，只有2个线程按预期返回结果，所有其他线程似乎都超时了堆栈跟踪

[err] java.net.SocketTimeoutException: Read timed out
[err]     at java.net.SocketInputStream.socketRead0(Native Method)
[err]     at java.net.SocketInputStream.read(SocketInputStream.java:150)
[err]     at java.net.SocketInputStream.read(SocketInputStream.java:121)
[err]     at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
[err]     at sun.security.ssl.InputRecord.read(InputRecord.java:503)
[err]     at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:954)
[err]     at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1343)
[err]     at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1371)
[err]     at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1355)
[err]     at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:563)
[err]     at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
[err]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1511)
[err]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1439)
[err]     at com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl.getInputStream(HttpsURLConnectionOldImpl.java:224)

我使用-Djavax.net.debug = all启用调试选项，这里有一些显示在控制台上的痕迹

Default Executor-thread-15, called closeInbound()
Default Executor-thread-15, fatal error: 80: Inbound closed before receiving peer's close_notify: possible truncation attack?
javax.net.ssl.SSLException: Inbound closed before receiving peer's close_notify: possible truncation attack?
%% Invalidated:  [Session-19, TLS_RSA_WITH_AES_128_CBC_SHA256]
Default Executor-thread-15
, SEND TLSv1.2 ALERT:
fatal,
description = internal_error
Default Executor-thread-15, Exception sending alert: java.io.IOException: writer side was already closed.

我的问题是为什么在与服务器本身建立连接时会出现问题？为什么每次只有两个连接可以恢复？我该怎么解决？我尝试使用http.maxConnections设置系统属性 System.setProperty("http.maxConnections", String.valueOf(300));但它没有帮助。

当它是自https连接时，线程使用java.net.HttpURLConnection挂起

0 个答案: