http - 什么是 OpenTSDB 中的分块请求？

Question

我正在使用 Qt4 将一些数据点发布到不支持分块 HTTP 请求的 OpenTSDB 服务器。

代码基本上是这样的:

QNetworkRequest request(m_url);
request.setHeader(QNetworkRequest::ContentTypeHeader, QString("application/json"));
request.setHeader(QNetworkRequest::ContentLengthHeader, jsonRequest.toAscii().size());
m_networkAccessManager.post(request, jsonRequest.toAscii());

jsonRequest 是一个包含数据点的 QString。时不时调用这段代码上传数据到服务器，一般都可以正常运行。但是，有时我会收到来自 openTSDB 的错误消息，指出“不支持分块请求”。当请求变得更大时(更大，我指的是一些 KB 的数据)，这似乎会发生。

编辑:当问题出现时，我已经对请求进行了 tcpdump，实际上它并没有被分块:

POST /api/put HTTP/1.1
Content-Type: application/json
Content-Length: 14073
Connection: Keep-Alive
Accept-Encoding: gzip
Accept-Language: en,*
User-Agent: Mozilla/5.0
Host: 192.168.xx.xxx:xxxx

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400 Bad Request
Content-Length: 1080
Content-Type: text/html; charset=UTF-8
Date: Thu, 08 Jan 2015 17:18:43 GMT

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv=content-type content="text/html;charset=utf-8"><title>Bad Request</title>
<style><!--
body{font-family:arial,sans-serif;margin-left:2em}A.l:link{color:#6f6f6f}A.u:link{color:green}.subg{background-color:#e2f4f7}.fwf{font-family:monospace;white-space:pre-wrap}//--></style></head>
<body text=#000000 bgcolor=#ffffff><table border=0 cellpadding=2 cellspacing=0 width=100%><tr><td rowspan=3 width=1% nowrap><b><font color=#c71a32 size=10>T</font><font color=#00a189 size=10>S</font><font color=#1a65b7 size=10>D</font>&nbsp;&nbsp;</b><td>&nbsp;</td></tr><tr><td class=subg><font color=#507e9b><b>Looks like it's your fault this time</b></td></tr><tr><td>&nbsp;</td></tr></table><blockquote><h1>Bad Request</h1>Sorry but your request was rejected as being invalid.<br/><br/>The reason provided was:<blockquote>Chunked request not supported.</blockquote></blockquote><table width=100% cellpadding=0 cellspacing=0><tr><td class=subg><img alt="" width=1 height=6></td></tr></table></body></html>

当请求变大时，我认为 Qt 正在更改为使用分块请求，但事实并非如此。所以现在的问题是:openTSDB 中的分块请求是什么？

Answer 1

我终于找到了它认为我的请求被分块的原因:OpenTSDB 在内部使用 Netty 进行网络连接，如果 Netty 读取了一个不包含完整请求的 block ，那么它就会被标记为分块，即使没有传输- 请求中的编码 header 。

有两种可能的解决方案:

• 将“tsd.http.request.enable_chunked = true”添加到配置文件，这样它就不会拒绝分块请求并将“tsd.http.request.max_chunk =”添加到配置文件，并将其设置为一个适合您的请求的大小
• 如果你可以改变客户端，强制它发送较小的请求

请注意，为面向公众的服务器启用分块请求可能不是一个好主意，因为恶意客户端可以发送无限请求，使服务器过载。

感谢 irc 用户 jaylr 和 manolama，他们在 irc channel #opentsdb@freenode.net 上为我提供了信息