2. 测试一下这个超时的含义 http://tomcat.apache.org ..." /> 2. 测试一下这个超时的含义 http://tomcat.apache.org ..."/> li3huo.com – Tomcat Connector connectionTimeout含义和验证

Tomcat Connector connectionTimeout含义和验证

Posted on Wed 28 April 2010 in 我用(IT)

1. Tomcat配置

今天小戚发出一封邮件，说因为线上系统中tomcat的连接超时（connectionTimeout）设置成60ms，造成第三方访问公司的服务，总是502异常。

这个设置在$tomcat/conf/server.xml中 

<!-- Define a non-SSL HTTP/1.1 Connector on port 8080 -->
    <Connector port="8080" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="2000" disableUploadTimeout="true" />

2. 测试一下这个超时的含义

http://tomcat.apache.org/tomcat-5.5-doc/config/http.html

connectionTimeout ：

  • 单位是毫秒，Connector从接受连接到提交URI的等待的时间。

The number of milliseconds this Connector will wait, after accepting a connection, for the request URI line to be presented. The default value is 60000 (i.e. 60 seconds).

以上中文是经过如下分析过程得出的。

 

2.1. 是否是整个连接处理的时间？

写了一个servlet，doGet先sleep一段时间，再写一个输出，直接用浏览器访问。

经过测试，发现和这个时间无关。

 

2.2. 用HttpURLConnection做测试

写客户端模拟超时，可能是因为API直接实现到提交URI了，另外还怀疑底层有自动保持连接的动作，反正怎么Sleep都不超时，得换个写法了。

明天连上TCPMon看看后台有没有自动保持连接的动作。 

        def sURL="http://localhost:8080/index.jsp"
        URL url = new URL(sURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

2.3. 用telnet收工测试

直接用telnet连上tomcat，如果什么都不输入，socket很快回断开，输入完整GET。。。，能够获得输出。如果不保持输入，则连接很快会断开。如果一直不停输入，连接继续保持。 

$ telnet localhost 8080

GET /index.jsp HTTP/1.1
Accept-Language: zh-cn
Connection: Keep-Alive
Host: 192.168.0.53
Content-Length: 36

2.4. 直接写Socket做测试

还是2s超时，睡一秒能够正确获得输出，睡2秒，输出为空。

以下是Groovy代码 

content ="""GET /index.jsp HTTP/1.1
Accept-Language: zh-cn
Connection: Keep-Alive
Host: 192.168.0.53
Content-Length: 36

"""
def sleepTime=1000
Socket socket = new Socket("localhost",8080)

println "is keep alive? " + socket.getKeepAlive()

println "sleep " + sleepTime + " ms."
Thread.sleep(sleepTime)
println "is closed? " + socket.isClosed()

println "sleep " + sleepTime + " ms."
//Thread.sleep(sleepTime)

println "write socket begin======"
writeStream(content, socket.getOutputStream())

println "read socket begin======"
println readStream(socket.getInputStream())[0..300]

void writeStream(content, stream) {
        OutputStream buf = new BufferedOutputStream(stream);
        OutputStreamWriter out = new OutputStreamWriter(buf, "UTF-8");
        out.write(content)
        out.flush();
        print content
        //out.close();
}

String readStream(stream){
        String sResult=""
        byte[] buffer = new byte[1024];

        int readCount = stream.read(buffer);

        while (readCount != -1) {
                sResult += new String(buffer, 0,
                            readCount, "utf-8");
                readCount = stream.read(buffer);
        }
        stream.close()
        return sResult
}

用Groovy写测试代码真舒服，呵呵。

Groovy Tomcat