websocket: the client is not using the websocket protocol: 'upgrade' token not found in 'Connection' header

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英文:

websocket: the client is not using the websocket protocol: 'upgrade' token not found in 'Connection' header

问题

我正在尝试在使用Go编写的服务器和JavaScript前端之间建立WebSocket连接。我在一个目录中有以下文件:

main.go
index.html

以下是我在main.go中的Go代码:

package main

import (
	"fmt"
	"log"
	"net/http"

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
}

func homePage(w http.ResponseWriter, r *http.Request) {
	http.ServeFile(w, r, "./index.html")
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println("Error in handler:", err)
		return
	}
	log.Println("Client connected.")

	for {
		messageType, p, err := conn.ReadMessage()
		if err != nil {
			log.Println("Fehler in ReadMessage:", err)
			return
		}

		log.Println(string(p))

		//echo message to client
		if err := conn.WriteMessage(messageType, p); err != nil {
			log.Println(err)
			return
		}
	}
}

func setupRoutes() {
	http.HandleFunc("/ws", homePage)
}

func main() {
	fmt.Println("Server gestartet")
	setupRoutes()
	log.Fatal(http.ListenAndServe(":9100", nil))
}

以下是index.html中的HTML和JavaScript代码:

<!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="UTF-8">
    <title>Some unimportant html </title>
</head>
<body>
    
    <script>


        let socket = new WebSocket("ws://localhost:9100/ws");
        console.log("Websocket started.");

        socket.onOpen = () => {
            console.log("Client started.");
        }

        socket.onclose = (event) => {
            console.log("Socket closed: ", event);
        }

        socket.onError = (error) => {
            console.log("Socket Error: ", error);
        }

        socket.onMessage = (msg) => {
            console.log(msg);
        }
    </script>
</body>
</html>

然而,当我使用go run main.go运行时,我得到以下错误:

2022/11/20 16:38:33 http: superfluous response.WriteHeader call from github.com/gorilla/websocket.(*Upgrader).returnError (server.go:83)
2022/11/20 16:38:33 Error in handler: websocket: the client is not using the websocket protocol: 'upgrade' token not found in 'Connection' header
2022/11/20 16:38:33 Error in handler: write tcp [::1]:9100->[::1]:63712: wsasend: Eine bestehende Verbindung wurde softwaregesteuert durch den Hostcomputer abgebrochen.
2022/11/20 16:39:06 Error in handler: write tcp [::1]:9100->[::1]:63733: wsasend: Eine bestehende Verbindung wurde softwaregesteuert durch den Hostcomputer abgebrochen.
exit status 0xc000013a

德语部分的意思是“现有连接被主机计算机软件控制终止”。

我可能遗漏了一些东西,我的理解不够深入,无法确定问题出在哪里。非常感谢任何帮助!

我想也许我的JS WebSocket缺少升级,但是在Chrome中,我可以看到请求URL ws://localhost:9100/ws 的请求头,其中包含“Upgrade: websocket”:

Accept-Encoding: gzip, deflate, br
Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7
Cache-Control: no-cache
Connection: Upgrade
Host: localhost:9100
Origin: http://localhost:9100
Pragma: no-cache
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
Sec-WebSocket-Key: h3DWLuXsI9/GkTo+sIjyzw==
Sec-WebSocket-Version: 13
Upgrade: websocket
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36
英文:

I am trying to set up a websocket connection with the server written in Go and a JavaScript frontend. I have the following files in one directory:

main.go
index.html

**This is my Go code in main.go: **

package main


import (
	&quot;fmt&quot;
	&quot;log&quot;
	&quot;net/http&quot;

	&quot;github.com/gorilla/websocket&quot;
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
}

func homePage(w http.ResponseWriter, r *http.Request) {
	http.ServeFile(w, r, &quot;./index.html&quot;)
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println(&quot;Error in handler:&quot;, err)
		return
	}
	log.Println(&quot;Client connected.&quot;)

	for {
		messageType, p, err := conn.ReadMessage()
		if err != nil {
			log.Println(&quot;Fehler in ReadMessage: &quot;, err)
			return
		}

		log.Println(string(p))

		//echo message to client
		if err := conn.WriteMessage(messageType, p); err != nil {
			log.Println(err)
			return
		}
	}
}

func setupRoutes() {
	http.HandleFunc(&quot;/ws&quot;, homePage)
}

func main() {
	fmt.Println(&quot;Server gestartet&quot;)
	setupRoutes()
	log.Fatal(http.ListenAndServe(&quot;:9100&quot;, nil))

}

And this is the HTML and JavaScript in index.html:

&lt;!DOCTYPE html&gt;
&lt;html lang=&quot;de&quot;&gt;
&lt;head&gt;
    &lt;meta charset=&quot;UTF-8&quot;&gt;
    &lt;title&gt;Some unimportant html &lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    
    &lt;script&gt;


        let socket = new WebSocket(&quot;ws://localhost:9100/ws&quot;);
        console.log(&quot;Websocket started.&quot;);

        socket.onOpen = () =&gt; {
            console.log(&quot;Client started.&quot;);
        }

        socket.onclose = (event) =&gt; {
            console.log(&quot;Socket closed: &quot;, event);
        }

        socket.onError = (error) =&gt; {
            console.log(&quot;Socket Error: &quot;, error);
        }

        socket.onMessage = (msg) =&gt; {
            console.log(msg);
        }
    &lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;

However, when I run the thing with go run main.go I get the following error:

2022/11/20 16:38:33 http: superfluous response.WriteHeader call from github.com/gorilla/websocket.(*Upgrader).returnError (server.go:83)
2022/11/20 16:38:33 Error in handler: websocket: the client is not using the websocket protocol: &#39;upgrade&#39; token not found in &#39;Connection&#39; header
2022/11/20 16:38:33 Error in handler: write tcp [::1]:9100-&gt;[::1]:63712: wsasend: Eine bestehende Verbindung wurde softwaregesteuert durch den Hostcomputer abgebrochen.
2022/11/20 16:39:06 Error in handler: write tcp [::1]:9100-&gt;[::1]:63733: wsasend: Eine bestehende Verbindung wurde softwaregesteuert durch den Hostcomputer abgebrochen.
exit status 0xc000013a

The German lines mean "the existing connection was software controlled terminated by the host computer"

I am missing something and my understanding doesn't run deep enough to pinpoint what's wrong. Any help is much appreciated!

I thought maybe my JS Websocket is missing an upgrade, but in Chrome I can see the following request header for Request URL ws://localhost:9100/ws that says "Upgrade:websocket"

Accept-Encoding: gzip, deflate, br
Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7
Cache-Control: no-cache
Connection: Upgrade
Host: localhost:9100
Origin: http://localhost:9100
Pragma: no-cache
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
Sec-WebSocket-Key: h3DWLuXsI9/GkTo+sIjyzw==
Sec-WebSocket-Version: 13
Upgrade: websocket
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

答案1

得分: 1

感谢Cerise Limón的有用评论,我成功修复了它。问题是我需要一个用于索引文件的端点,另一个用于websocket。所以我将相关部分更改为以下内容:

func websocketHandler(w http.ResponseWriter, r *http.Request) {
    conn, err := upgrader.Upgrade(w, r, nil) //conn是一个websocket连接(从http转换为websocket协议)
    if err != nil {
        log.Println("处理程序中的错误:", err)
        return
    }
    log.Println("客户端已连接。")

    for {
        messageType, p, err := conn.ReadMessage()
        if err != nil {
            log.Println("ReadMessage中的错误:", err)
            return
        }

        log.Println(string(p))

        //将消息回显给客户端
        if err := conn.WriteMessage(messageType, p); err != nil {
            log.Println(err)
            return
        }
    }
}

func homePage(w http.ResponseWriter, r *http.Request) {
    http.ServeFile(w, r, "./index.html")
}

func setupRoutes() {
    http.HandleFunc("/", homePage)
    http.HandleFunc("/ws", websocketHandler)
}
英文:

Thanks to the helpful comment by Cerise Limón I was able to fix it. The problem was that I needed one endpoint for the index file and another one for the websocket. So I changed the relevant parts to this:

func websocketHandler(w http.ResponseWriter, r *http.Request) {
	conn, err := upgrader.Upgrade(w, r, nil) //conn is a websocket connection (aus http wird websocket protokoll)
	if err != nil {
		log.Println(&quot;Error in handler:&quot;, err)
		return
	}
	log.Println(&quot;Client connected.&quot;)

	
	for {
		messageType, p, err := conn.ReadMessage()
		if err != nil {
			log.Println(&quot;Fehler in ReadMessage: &quot;, err)
			return
		}

		log.Println(string(p))

		//echo message to client
		if err := conn.WriteMessage(messageType, p); err != nil {
			log.Println(err)
			return
		}
	}
}

func homePage(w http.ResponseWriter, r *http.Request) {
	http.ServeFile(w, r, &quot;./index.html&quot;)
}

func setupRoutes() {
	http.HandleFunc(&quot;/&quot;, homePage)
	http.HandleFunc(&quot;/ws&quot;, websocketHandler)

}

huangapple
  • 本文由 发表于 2022年11月21日 00:16:39
  • 转载请务必保留本文链接:https://go.coder-hub.com/74509802.html
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