netty：启用 keep-alive 时，http 文件示例无法与 apache bench 一起使用

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

上面的例子我是用netty-4.1.0.beta8编译的

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headers。

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

可以看到文档长度为0字节。

我运行针对 www.google.com 的类似命令，它工作正常。你能帮忙吗？提前致谢。

Answer 1

这是 ApacheBench 中的错误。

ApacheBench 不完全遵循 http 规范，并假定 headers 具有一定的大小写。因为 netty 应用程序返回的 headers 没有 ApacheBench 期望的字符大小写，它假定内容长度的默认值为 0 字节。

Http specification 4.2:

HTTP header fields, which include general-header (section 4.5), request-header (section 5.3), response-header (section 6.2), and entity-header (section 7.1) fields, follow the same generic format as that given in Section 3.1 of RFC 822 [9]. Each header field consists of a name followed by a colon (":") and the field value. Field names are case-insensitive. The field value MAY be preceded by any amount of LWS, though a single SP is preferred. Header fields can be extended over multiple lines by preceding each extra line with at least one SP or HT. Applications ought to follow "common form", where one is known or indicated, when generating HTTP constructs, since there might exist some implementations that fail to accept anything beyond the common forms.

因为 ApacheBench 的 keep-alive 开关强制它假设服务器支持 keep alive，所以它没有检测到 "missing" header keep alive 数据包。

这个问题应该在 ApacheBench 中解决，因为它是该应用程序中的一个错误，导致它错过正确的 content-length。

netty：启用 keep-alive 时，http 文件示例无法与 apache bench 一起使用

netty: the http file example can not work with apache bench when keep-alive is enabled

java

http

keep-alive

netty