netty：启用了保持活动状态时，http文件示例不适用于apache bench

Question

正在测试的http文件示例： https : //github.com/netty/netty/tree/4.1/example/src/main/java/io/netty/example/http/file

我用netty-4.1.0.beta8编译了上面的示例。

My test result:
$ ab -k -n 2 -c 1 -v 6 http://127.0.0.1:8080/test.sh
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)...INFO: POST header == 
---
GET /test.sh HTTP/1.0
Connection: Keep-Alive
Host: 127.0.0.1:8080
User-Agent: ApacheBench/2.3
Accept: */*


---
LOG: header received:
HTTP/1.1 200 OK
content-length: 462
content-type: application/octet-stream
date: Fri, 26 Feb 2016 06:34:52 GMT
expires: Fri, 26 Feb 2016 06:35:52 GMT
cache-control: private, max-age=60
last-modified: Fri, 19 Feb 2016 02:35:40 GMT
connection: keep-alive


LOG: Response code = 200
LOG: header received:
**MY TEST.SH CONTENT**

WARNING: Response code not 2xx (500)
apr_poll: The timeout specified has expired (70007)
Total of 1 requests completed

看来我的test.sh内容被认为是第二个请求的标头。

我的进一步测试：

$ ab -k -n 1 -c 1 -v 6 http://127.0.0.1:8080/test.sh 
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)...INFO: POST header == 
---
GET /test.sh HTTP/1.0
Connection: Keep-Alive
Host: 127.0.0.1:8080
User-Agent: ApacheBench/2.3
Accept: */*


---
LOG: header received:
HTTP/1.1 200 OK
content-length: 462
content-type: application/octet-stream
date: Fri, 26 Feb 2016 06:39:02 GMT
expires: Fri, 26 Feb 2016 06:40:02 GMT
cache-control: private, max-age=60
last-modified: Fri, 19 Feb 2016 02:35:40 GMT
connection: keep-alive


LOG: Response code = 200
..done


Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8080

Document Path:          /test.sh
Document Length:        0 bytes

Concurrency Level:      1
Time taken for tests:   0.005 seconds
Complete requests:      1
Failed requests:        0
Write errors:           0
Keep-Alive requests:    1
Total transferred:      263 bytes
HTML transferred:       0 bytes
Requests per second:    209.25 [#/sec] (mean)
Time per request:       4.779 [ms] (mean)
Time per request:       4.779 [ms] (mean, across all concurrent requests)
Transfer rate:          53.74 [Kbytes/sec] received

Connection Times (ms)
          min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:     5    5   0.0      5       5
Waiting:        5    5   0.0      5       5
Total:          5    5   0.0      5       5

您可以看到文档长度为0字节。

我在www.google.com上运行了类似的命令，并且运行正常。 您能帮上忙吗？ 提前致谢。

Answer 1

这是ApacheBench中的错误。

ApacheBench没有完全遵循http规范，并假定标头具有一定的大小写。 由于netty应用程序返回的标头不具有ApacheBench期望的字符大小写，因此它假定内容长度的默认值为0字节。

Http规范4.2：

HTTP标头字段包括通用标头（第4.5节），请求标头（第5.3节），响应标头（第6.2节）和实体标头（第7.1节）字段，它们遵循与本节相同的通用格式RFC 822 [3.1]中的3.1。 每个标题字段均由名称，后跟冒号（“：”）和字段值组成。 字段名称不区分大小写。 字段值可以在任何数量的LWS之前，尽管首选单个SP。 通过在每条额外的行之前添加至少一个SP或HT，可以将标题字段扩展到多行。 在生成HTTP构造时，应用程序应遵循“通用形式”，即已知形式或表示形式，因为某些实现可能无法接受通用形式以外的任何形式。

因为ApacheBench的keep-alive开关强制其假定服务器支持keep alive，所以它不会为keep alive数据包检测到“丢失”标头。

但是，此问题是应该在ApacheBench中解决的问题，因为这是该应用程序中的一个错误，导致它错过了正确的内容长度。