浏览器在发送 POST-body 之前空闲
我在网站上发现了一些看似随机的客户的非常有趣的行为。我看到的是，对服务器的随机 POST 请求会导致对后端的错误请求。我已经找到了请求不好的原因 - 但我仍然不知道为什么会发生这种情况。
- 客户端通过 HTTP 连接到 Web 服务器。
- 客户端发送普通 POST 请求的标头（而不是正文）
- 五秒钟过去了。缓存服务器将请求传递到其后端，因为完成请求的时间太长。
- 缓存服务器回复客户端，并带有错误消息 - 表明请求是错误的。
- 客户端在收到回复后几秒钟发送 POST 正文。
我毫不犹豫地接受缓存服务器可以重新配置以等待更长的时间。我的问题是；客户端在发送标头和发送 POST 正文之间等待几秒钟的原因可能是什么？我不知道这种行为在任何情况下都是有意义的。
这是一个相当普通的 Magento 电子商务网站，设置了 Haproxy ->清漆-> Nginx-> php5-fpm。 Varnish 是当空闲五秒后将请求发送到 Nginx 的组件。
- 我已经使用 tcpdump/wireshark 验证服务器在规定时间内没有收到来自客户端的 POST-body（在 Haproxy 之前也是如此）。
- 我已经验证这种情况发生在用户代理和各种请求（普通登录表单，ajax 回调）中，
有人有什么聪明的想法吗？
注意：我不确定这是 Stack Overflow 还是 Serverfault 的问题，但我认为这是一个需要开发人员知识的 HTTP 问题。
I have some very interesting behaviour from seemingly random clients on a website. What I see is that random POST-requests to the server result in a bad request to the backend. I've tracked down why the request is bad - but I still don't know WHY this occurs.
- Client connects to webserver with HTTP.
- Client sends the headers of an ordinary POST-request (not the body)
- Five seconds pass. The cache server passes the request to its backend, because it took too long to complete the request.
- The cache server replies to the client, with an error message - indicating that the request was bad.
- The client sends the POST-body - a few seconds after the reply has been received.
I have no problem accepting that the cache server can be reconfigured to wait longer. My problem is; What can be the reason for clients to wait several seconds between the headers sent, and sending the POST-body? I don't know of any cases where this behavior makes sense.
This is a fairly ordinary Magento eCommerce website, with a setup of Haproxy -> Varnish -> Nginx -> php5-fpm. Varnish is the component that ships the request to Nginx when five seconds of idling has passed.
- I have verified with tcpdump/wireshark that the server does not receive the POST-body from the client within the time (before Haproxy as well).
- I have verified that this occurs across user agents, and across the kind of requests (Being ordinary login forms, to ajax callbacks)
Does anyone have any clever ideas?
NOTE: I wasn't sure if this was a question for Stack Overflow or Serverfault, but I consider this an HTTP question that requires developer-knowledge.
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服务器有问题——您不应该将部分请求从前端发送到后端。在传输 POST 正文之前，客户端可能正在等待服务器的 HTTP/100 Continue 响应。客户端也可能正在生成 POST 数据，但由于某种原因花费了一些时间。
The server is buggy-- you shouldn't send partial requests from the front-end to the backend. It's possible that the client is waiting for a HTTP/100 Continue response for the server before transmitting the POST body. It's also possible that the client is generating the POST data and that's taken some time for some reason.