Netty ChannelUpstreamHandler 和 HTTP 流水线

Question

我在玩 Netty 示例 org.jboss.netty.example.http.snoop，我注意到 Firefox 执行 4 个请求导致创建 4 个 HttpRequestHandler 实例，Internet Explorer 8/9 执行 2 个请求导致创建 2 个 HttpRequestHandler 实例。

我认为这是由于 HTTP 1.1 管道，但是即使更改了 FireFox 的 network.http.pipelining.* 键和 IE 的 HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings 注册表项，Netty 的行为方式也相同。

我的问题是，这是预期的和正确的，还是我遗漏了什么？是否可以配置 Netty 以丢弃后续的幂等请求，或者这最终必须由 HttpRequestHandler 实现？

Answer 1

您应该打印出路径以找出 FF 请求的内容。我很确定它是 favicon.ico，它被多次请求（重试机制），因为 Snoop 示例发送的格式无效。

编辑。我验证了，确实是favicon，请求了3次：

Thread[New I/O server worker #1-3,5,main] - [id: 0x57c52e72, /0:0:0:0:0:0:0:1:63056 => /0:0:0:0:0:0:0:1:8080] RECEIVED: DefaultHttpRequest(chunked: false) GET / HTTP/1.1 Host: localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive
Thread[New I/O server worker #1-3,5,main] - GET
Thread[New I/O server worker #1-3,5,main] - /

Thread[New I/O server worker #1-3,5,main] - [id: 0x57c52e72, /0:0:0:0:0:0:0:1:63056 => /0:0:0:0:0:0:0:1:8080] RECEIVED: DefaultHttpRequest(chunked: false) GET /favicon.ico HTTP/1.1 Host: localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0 Accept: image/png,image/*;q=0.8,*/*;q=0.5 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive
Thread[New I/O server worker #1-3,5,main] - GET
Thread[New I/O server worker #1-3,5,main] - /favicon.ico

Thread[New I/O server worker #1-3,5,main] - [id: 0x57c52e72, /0:0:0:0:0:0:0:1:63056 => /0:0:0:0:0:0:0:1:8080] RECEIVED: DefaultHttpRequest(chunked: false) GET /favicon.ico HTTP/1.1 Host: localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive
Thread[New I/O server worker #1-3,5,main] - GET
Thread[New I/O server worker #1-3,5,main] - /favicon.ico

Thread[New I/O server worker #1-3,5,main] - [id: 0x57c52e72, /0:0:0:0:0:0:0:1:63056 => /0:0:0:0:0:0:0:1:8080] RECEIVED: DefaultHttpRequest(chunked: false) GET /favicon.ico HTTP/1.1 Host: localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive
Thread[New I/O server worker #1-3,5,main] - GET
Thread[New I/O server worker #1-3,5,main] - /favicon.ico