Backend Development
Golang
websocket: Client not using websocket protocol: 'Upgrade' token not found in 'Connection' header
websocket: Client not using websocket protocol: 'Upgrade' token not found in 'Connection' header
When making a WebSocket connection, sometimes the error "Client is not using the WebSocket protocol: 'Upgrade' token not found in 'Connection' header" error will appear. This error is usually caused by the client not using the WebSocket protocol correctly. WebSocket is a protocol that enables two-way communication between a client and a server, using a special handshake process to establish a connection. During the handshake, the client needs to properly send the "Upgrade" header to indicate the use of the WebSocket protocol. If the client does not send this header correctly, the server will return the above error. PHP editor Baicao will introduce in detail how to solve this problem in this article so that your WebSocket connection can proceed smoothly.
Question content
I'm trying to establish a websocket connection to a server written in go and javascript frontend. I have the following files in a directory:
main.go index.html
**This is my go code in main.go: **
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))
}This is the html and javascript in index.html:
<!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> However, when I run the thing using 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: '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
The German meaning is "The existing connection is terminated under the control of the host software"
I'm missing something, and my understanding isn't deep enough to figure out what the problem is. Any help is greatly appreciated!
I thought maybe my js websocket was missing an upgrade, but in chrome I can see the following request header for the request url ws://localhost:9100/ws which 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
Solution
I was able to fix it thanks to cerise limón's helpful comment. The problem is that I need one endpoint for indexing files and another for websockets. So I changed the relevant part to:
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("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 homePage(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "./index.html")
}
func setupRoutes() {
http.HandleFunc("/", homePage)
http.HandleFunc("/ws", websocketHandler)
}The above is the detailed content of websocket: Client not using websocket protocol: 'Upgrade' token not found in 'Connection' header. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1664
14
1421
52
1315
25
1266
29
1239
24
Golang's Purpose: Building Efficient and Scalable Systems
Apr 09, 2025 pm 05:17 PM
Go language performs well in building efficient and scalable systems. Its advantages include: 1. High performance: compiled into machine code, fast running speed; 2. Concurrent programming: simplify multitasking through goroutines and channels; 3. Simplicity: concise syntax, reducing learning and maintenance costs; 4. Cross-platform: supports cross-platform compilation, easy deployment.
Golang vs. Python: Performance and Scalability
Apr 19, 2025 am 12:18 AM
Golang is better than Python in terms of performance and scalability. 1) Golang's compilation-type characteristics and efficient concurrency model make it perform well in high concurrency scenarios. 2) Python, as an interpreted language, executes slowly, but can optimize performance through tools such as Cython.
Golang and C : Concurrency vs. Raw Speed
Apr 21, 2025 am 12:16 AM
Golang is better than C in concurrency, while C is better than Golang in raw speed. 1) Golang achieves efficient concurrency through goroutine and channel, which is suitable for handling a large number of concurrent tasks. 2)C Through compiler optimization and standard library, it provides high performance close to hardware, suitable for applications that require extreme optimization.
Golang's Impact: Speed, Efficiency, and Simplicity
Apr 14, 2025 am 12:11 AM
Goimpactsdevelopmentpositivelythroughspeed,efficiency,andsimplicity.1)Speed:Gocompilesquicklyandrunsefficiently,idealforlargeprojects.2)Efficiency:Itscomprehensivestandardlibraryreducesexternaldependencies,enhancingdevelopmentefficiency.3)Simplicity:
Golang vs. Python: Key Differences and Similarities
Apr 17, 2025 am 12:15 AM
Golang and Python each have their own advantages: Golang is suitable for high performance and concurrent programming, while Python is suitable for data science and web development. Golang is known for its concurrency model and efficient performance, while Python is known for its concise syntax and rich library ecosystem.
Golang and C : The Trade-offs in Performance
Apr 17, 2025 am 12:18 AM
The performance differences between Golang and C are mainly reflected in memory management, compilation optimization and runtime efficiency. 1) Golang's garbage collection mechanism is convenient but may affect performance, 2) C's manual memory management and compiler optimization are more efficient in recursive computing.
The Performance Race: Golang vs. C
Apr 16, 2025 am 12:07 AM
Golang and C each have their own advantages in performance competitions: 1) Golang is suitable for high concurrency and rapid development, and 2) C provides higher performance and fine-grained control. The selection should be based on project requirements and team technology stack.
Golang vs. C : Performance and Speed Comparison
Apr 21, 2025 am 12:13 AM
Golang is suitable for rapid development and concurrent scenarios, and C is suitable for scenarios where extreme performance and low-level control are required. 1) Golang improves performance through garbage collection and concurrency mechanisms, and is suitable for high-concurrency Web service development. 2) C achieves the ultimate performance through manual memory management and compiler optimization, and is suitable for embedded system development.
