英文:
Show Progress while processing post request in golang webapp
问题
收到POST请求后，发布的数据会经过几个函数处理，处理完成后会显示适当的网页。问题在于，由于处理数据的函数需要一些时间，所以会有一点延迟。
有没有办法可以向客户端显示数据处理的进度？基本上，当数据被发布时，我希望显示一些消息，例如：
正在加载数据（完成xyz转换）
正在加载数据（xyz已添加到流中）
我在后端使用的是Go语言和julienschmidt的httprouter。
英文:
On receiving the post request, the posted data passes through several functions and when the processing is done, it displays a suitable web page. The problem is that there is a bit of delay since the functions for processing data are somewhat time taking.
Is there a way I can show clients the progress of data processing? Essentially, when a data is posted, I want some messages to be dislayed like
Loading data (xyz conversion done)
Loading data (xyz added to stream)
I am using golang for my backend and julienschmidt's httprouter .
答案1
得分: 1
在你的处理程序中，func(w ResponseWriter, r *Request)中的w ResponseWriter很可能实现了http.Flusher接口。因此，你可以在所有工作完成之前向客户端刷新数据。
io.WriteString(w, "Loading data (xyz conversion done)")
w.(http.Flusher).Flush() //你必须断言它实现了Flusher接口
io.WriteString(w, payload)
在掌握更多控制权的情况下，你甚至可以劫持连接。
conn, bufrw, err := w.(http.Hijacker).Hijack()
defer conn.Close()
bufrw.WriteString("Loading data (xyz conversion done)")
bufrw.Flush()
bufrw.WriteString("Loading data (xyz added to stream)")
bufrw.Flush()
并进行原始的TCP通信。
英文:
w ResponseWriter in your Handlers func(w ResponseWriter,r *Request) most likely implements http.Flusher interface. So you can
io.WriteString(w, "Loading data (xyz conversion done)")
w.(http.Flusher).Flush() //you must assert it implements
io.WriteString(w, payload)
flush to client before all work done.
To take more control you even can hijack connection
conn, bufrw, err :=w.(http.Hijacker).Hijack()
defer conn.Close()
bufrw.WriteString("Loading data (xyz conversion done)")
bufrw.Flush()
bufrw.WriteString("Loading data (xyz added to stream)")
bufrw.Flush()
and speak raw TCP.
答案2
得分: 1
显示进度指示器是客户端代码的工作（在进行异步调用时）。
HTTP是一种请求-响应协议。响应具有标准格式（包括状态行、头部和消息体）。它们不会分部分发送。
你所建议的可能与TCP连接相关，但与HTTP无关。
英文:
Showing a progress indicator is the job of your client-side code (while making an asynchronous call).
HTTP is a request–response protocol. Responses have a standard format (including a status line, headers, message body). They are not sent in parts.
What you are suggesting would be relevant to a TCP connection but not HTTP.
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