Apache Jmeter随机定时器+；清漆问题

我有一个简单的jmeter计划，它使用统一随机计时器：

Random Delay Maximum (in milliseconds): 15000.0
Constant Delay Offset (in milliseconds): 5000

我正在使用的HTTP头数据：

Content-Type     application/x-www-form-urlencoded
Accept-Language  lt,en-us;q=0.7,en;q=0.3
Accept           text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent           Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0
Referer          http://.../.../tao/Main/login
Accept-Encoding  gzip, deflate

请求数据：

POST http://.../.../tao/Main/login

POST data:
loginForm_sent=1&login=u509&password=demo&processUri=&activityUri=&connect=Log+in

Cookie Data:
tao_XK0R3qTp=uijd30hi0gls2i9l2i2ikr97b3

Request Headers:
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Accept-Language: lt,en-us;q=0.7,en;q=0.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0
Referer: http://.../.../tao/Main/login
Accept-Encoding: gzip, deflate
Content-Length: 81
Host: ...

当我不使用随机定时器时，这是有效的。但是当我使用随机定时器时，这个HTTP请求不起作用

Thread Name: ... 1-1
Sample Start: 2014-03-25 13:16:54 EET
Load time: 1
Latency: 0
Size in bytes: 1939
Headers size in bytes: 0
Body size in bytes: 1939
Sample Count: 1
Error Count: 1
Response code: Non HTTP response code: org.apache.http.NoHttpResponseException
Response message: Non HTTP response message: The target server failed to respond

Response headers:


HTTPSampleResult fields:
ContentType: 
DataEncoding: null

错误的HTTP请求-响应数据：

org.apache.http.NoHttpResponseException: The target server failed to respond
    at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:95)
    at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:61)
    at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:254)
    at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:289)
    at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:252)
    at org.apache.http.impl.conn.ManagedClientConnectionImpl.receiveResponseHeader(ManagedClientConnectionImpl.java:191)
    at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:300)
    at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:127)
    at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:715)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:520)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:481)
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:298)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1105)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1094)
    at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:429)
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:257)
    at java.lang.Thread.run(Unknown Source)

清漆配置： 我尚未更改任何内容，因此默认配置为：

backend default {
     .host = "127.0.0.1";
     .port = "8080";
}

由此，我可以假设，由于某种原因，apache服务器没有收到这个请求，或者超时了？

---

所以总结一下我的问题：当我使用Varnish并且jmeter有随机计时器时，这个HTTP请求不起作用。当我移除随机定时器时，清漆没有问题。现在，当我不使用清漆时，它可以与随机定时器一起工作，也可以不使用随机定时器。我想这与其说是一个问题，不如说是一个想法/帮助的请求。我似乎无法解决这个问题。

似乎我必须将会话超时添加到

/etc/default/varnish/

：

 DAEMON_OPTS="-a :80 \
              -T localhost:6082 \
              -f /etc/varnish/default.vcl \
              -S /etc/varnish/secret \
              -s malloc,256m \
              -p sess_timeout=300"

虽然我真的不喜欢增加会话超时，所以如果你们中有人知道这个问题的更好答案，请继续回答