从工作socket.io示例（后端：Python / Flask，前端：socket.io.js v2.0.3）开始，我现在尝试使用Go设置客户端但是可以＆＃39 ; t甚至通过握手阶段。为长篇帖子道歉...（最后我还添加了一个Python客户端，它实现了我想在Go中实现的功能）
后端
@socketio.on('connect', namespace='/endpoint')
def connect():
print("Client connected with request sid "+request.sid)
@socketio.on('join', namespace='/endpoint')
def join(message):
print("Server received from client:" +message)
print("Client just joined room with request sid "+request.sid)
join_room(request.sid)
前端
namespace = '/endpoint';
var socket = io.connect(location.protocol + '//' + document.domain + ':' + location.port + namespace);
var client_join_message = "This is a client";
socket.emit('join', client_join_message);
开发人员工具：我注意到一些请求，直到浏览器和服务器选择使用websockets和交换框架：
http://localhost:5000/socket.io/?EIO=3&transport=polling&t=LxcgetJ
http://localhost:5000/socket.io/?EIO=3&transport=polling&t=Lxcgetf&sid=025e105a5093467d994a891367380aa3
http://localhost:5000/socket.io/?EIO=3&transport=polling&t=Lxcgeti&sid=025e105a5093467d994a891367380aa3
ws://localhost:5000/socket.io/?EIO=3&transport=websocket&sid=025e105a5093467d994a891367380aa3
http://localhost:5000/socket.io/?EIO=3&transport=polling&t=Lxcgetw&sid=025e105a5093467d994a891367380aa3
http://localhost:5000/socket.io/?EIO=3&transport=polling&t=Lxcgetx&sid=025e105a5093467d994a891367380aa3
服务器日志：
"GET /socket.io/?EIO=3&transport=polling&t=LxcgetJ HTTP/1.1" 200 381 0.000322
Client connected with request sid 025e105a5093467d994a891367380aa3
"POST /socket.io/?EIO=3&transport=polling&t=Lxcgetf&sid=025e105a5093467d994a891367380aa3 HTTP/1.1" 200 219 0.000806
(6450) accepted ('127.0.0.1', 45034)
"GET /socket.io/?EIO=3&transport=polling&t=Lxcgeti&sid=025e105a5093467d994a891367380aa3 HTTP/1.1" 200 227 0.003941
"POST /socket.io/?EIO=3&transport=polling&t=Lxcgetw&sid=025e105a5093467d994a891367380aa3 HTTP/1.1" 200 219 0.001650
"GET /socket.io/?EIO=3&transport=polling&t=Lxcgetx&sid=025e105a5093467d994a891367380aa3 HTTP/1.1" 200 215 0.000235
Server received from client:This is a client
Client just joined room with request sid 025e105a5093467d994a891367380aa3
代码来自client中的github.com/graarh/golang-socketio示例：
package main
import (
"github.com/graarh/golang-socketio"
"github.com/graarh/golang-socketio/transport"
"log"
"runtime"
"time"
)
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
c, err := gosocketio.Dial(
gosocketio.GetUrl("127.0.0.1", 5000, false),
transport.GetDefaultWebsocketTransport())
if err != nil {
log.Fatal(err)
}
err = c.On(gosocketio.OnDisconnection, func(h *gosocketio.Channel) {
log.Fatal("Disconnected")
})
if err != nil {
log.Fatal(err)
}
err = c.On(gosocketio.OnConnection, func(h *gosocketio.Channel) {
log.Println("Connected")
})
if err != nil {
log.Fatal(err)
}
time.Sleep(1 * time.Second)
}
转码输出：
Connected
服务器日志：
"GET /socket.io/?EIO=3&transport=websocket HTTP/1.1" 200 0 1.004291
我有什么遗失的吗？使用Go代码，我看不到任何sid，transport=polling ...此外，只有少数问题被[go] [socket.io]标记，这让我觉得我和我一样。我选择了错误的道路......我会对任何想法和想法感激不尽。
您的代码产生以下内容：
客户端：
$ go run gotest5.go
2017/10/11 11:21:40 Connected
2017/10/11 11:21:40 result ""
2017/10/11 11:21:40 Done
服务器：
(4380) wsgi starting up on http://127.0.0.1:5000
(4380) accepted ('127.0.0.1', 38860)
127.0.0.1 - - [11/Oct/2017 11:21:40] "GET /socket.io/?EIO=3&transport=websocket HTTP/1.1" 200 0 0.003100
请注意，服务器功能on.('connect'...)和on.('join',...)没有生成日志。
from socketIO_client import SocketIO, BaseNamespace
class ThisNamespace(BaseNamespace):
def on_connect(self):
print('[Connected]')
def on_reconnect(self):
print('[Reconnected]')
def on_disconnect(self):
print('[Disconnected]')
with SocketIO('127.0.0.1', 5000, ThisNamespace) as socketIO:
this_namespace = socketIO.define(ThisNamespace, '/endpoint')
客户日志：
python3 test.py
[Connected]
[Disconnected]
[Disconnected]
服务器日志：
(6047) wsgi starting up on http://127.0.0.1:5000
(6047) accepted ('127.0.0.1', 38900)
127.0.0.1 - - [11/Oct/2017 11:53:27] "GET /socket.io/?t=1507712007314-0&transport=polling&EIO=3 HTTP/1.1" 200 381 0.000859
(6047) accepted ('127.0.0.1', 38902)
Client connected with request sid 919ed69264dd4e9f93e7af0294970dbd
Client disconnected with request.sid 919ed69264dd4e9f93e7af0294970dbd
127.0.0.1 - - [11/Oct/2017 11:53:27] "GET /socket.io/?sid=919ed69264dd4e9f93e7af0294970dbd&transport=websocket&EIO=3 HTTP/1.1" 200 0 0.032171
答案 0 :(得分：1)
我认为你做对了，除非你忘了实际发送join消息，可能是这样的：
package main
import (
"log"
"runtime"
"sync"
"time"
"github.com/graarh/golang-socketio"
"github.com/graarh/golang-socketio/transport"
)
func doSomethingWith(c *gosocketio.Client, wg *sync.WaitGroup) {
if res, err := c.Ack("join", "This is a client", time.Second*3); err != nil {
log.Printf("error: %v", err)
} else {
log.Printf("result %q", res)
}
wg.Done()
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
c, err := gosocketio.Dial(
gosocketio.GetUrl("127.0.0.1", 3003, false),
transport.GetDefaultWebsocketTransport())
if err != nil {
log.Fatal(err)
}
err = c.On(gosocketio.OnDisconnection, func(h *gosocketio.Channel) {
log.Fatal("Disconnected")
})
if err != nil {
log.Fatal(err)
}
err = c.On(gosocketio.OnConnection, func(h *gosocketio.Channel) {
log.Println("Connected")
})
if err != nil {
log.Fatal(err)
}
wg := &sync.WaitGroup{}
wg.Add(1)
go doSomethingWith(c, wg)
wg.Wait()
log.Printf("Done")
}
注意goroutine调用实际将“join”消息传递给服务器的函数。
另外，请注意在goroutine完成之前使用sync.WaitGroup来阻止，而不是使用time.Sleep()等待。
答案 1 :(得分：1)
根据上述评论，我们发现websocket连接本身正在运行。问题就在这里 - socket.io是多年前开发的，当时大多数浏览器和中间服务器/代理/路由器都没有很好地支持本机WebSockets。因此，在升级和降级连接时（例如，对于longpolling），它有一个特殊的检查和后备。如果您已经安装了连接，则无需与其他协议进行特殊密钥交换即可开始工作。
尝试开始使用连接并在应用程序级别逻辑（Join等）上执行后续步骤。它有效吗？
我认为现在WS对99％的客户都有很好的支持。如果您不想失去一些客户将无法工作的机会，您可以在项目中保留sockets.io。但有时你必须在WS中实现它的连接逻辑。