10

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。不时调用此代码将数据上传到服务器，并且通常可以正常工作。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，我的意思是一些 KB 的数据），这似乎会发生。

编辑：当问题出现时，我已经完成了请求的 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。所以当前的问题是：openTSDB 中的分块请求是什么？

4

1 回答 1

10

我终于找到了它认为我的请求被分块的原因：OpenTSDB 内部使用 Netty 进行联网，如果 Netty 读取的块不包含完整的请求，那么即使没有 Transfer-Encoding 标头，它也会被标记为分块在请求中。

有两种可能的解决方案：

  • 将“tsd.http.request.enable_chunk = true”添加到配置文件中，这样它就不会拒绝分块请求并将“tsd.http.request.max_chunk =”添加到配置文件中，并将其设置为合理的大小为您的要求
  • 如果您可以更改客户端，请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制的请求，从而使服务器过载。

感谢 irc 用户 jaylr 和 manolama，他们在 irc 频道 #opentsdb@freenode.net 上向我提供了信息

于 2015-01-08T18:19:58.477 回答