


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!

The article explains how to use the pprof tool for analyzing Go performance, including enabling profiling, collecting data, and identifying common bottlenecks like CPU and memory issues.Character count: 159

The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.

This article demonstrates creating mocks and stubs in Go for unit testing. It emphasizes using interfaces, provides examples of mock implementations, and discusses best practices like keeping mocks focused and using assertion libraries. The articl

This article explores Go's custom type constraints for generics. It details how interfaces define minimum type requirements for generic functions, improving type safety and code reusability. The article also discusses limitations and best practices

The article discusses Go's reflect package, used for runtime manipulation of code, beneficial for serialization, generic programming, and more. It warns of performance costs like slower execution and higher memory use, advising judicious use and best

The article discusses using table-driven tests in Go, a method that uses a table of test cases to test functions with multiple inputs and outcomes. It highlights benefits like improved readability, reduced duplication, scalability, consistency, and a

OpenSSL, as an open source library widely used in secure communications, provides encryption algorithms, keys and certificate management functions. However, there are some known security vulnerabilities in its historical version, some of which are extremely harmful. This article will focus on common vulnerabilities and response measures for OpenSSL in Debian systems. DebianOpenSSL known vulnerabilities: OpenSSL has experienced several serious vulnerabilities, such as: Heart Bleeding Vulnerability (CVE-2014-0160): This vulnerability affects OpenSSL 1.0.1 to 1.0.1f and 1.0.2 to 1.0.2 beta versions. An attacker can use this vulnerability to unauthorized read sensitive information on the server, including encryption keys, etc.

This article explores using tracing tools to analyze Go application execution flow. It discusses manual and automatic instrumentation techniques, comparing tools like Jaeger, Zipkin, and OpenTelemetry, and highlighting effective data visualization


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SublimeText3 Linux new version
SublimeText3 Linux latest version

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool