英文:
go-socket.io invalid transport
问题
我正在尝试使用go-socket.io库来构建一个使用golang的在线聊天应用程序，所以我按照文档中的示例创建了一个简单的结构。
我的main.go文件如下所示：
package mainimport ("log""net/http""github.com/gin-gonic/gin"socketio "github.com/googollee/go-socket.io")func GinMiddleware(allowOrigin string) gin.HandlerFunc {return func(c *gin.Context) {c.Writer.Header().Set("Access-Control-Allow-Origin", allowOrigin)c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT, DELETE")c.Writer.Header().Set("Access-Control-Allow-Headers", "Accept, Authorization, Content-Type, Content-Length, X-CSRF-Token, Token, session, Origin, Host, Connection, Accept-Encoding, Accept-Language, X-Requested-With")if c.Request.Method == http.MethodOptions {c.AbortWithStatus(http.StatusNoContent)return}c.Request.Header.Del("Origin")c.Next()}}func main() {router := gin.New()server := socketio.NewServer(nil)server.OnConnect("/", func(s socketio.Conn) error {s.SetContext("")log.Println("connected:", s.ID())return nil})server.OnEvent("/", "notice", func(s socketio.Conn, msg string) {log.Println("notice:", msg)s.Emit("reply", "have "+msg)})server.OnEvent("/chat", "msg", func(s socketio.Conn, msg string) string {s.SetContext(msg)return "recv " + msg})server.OnEvent("/", "bye", func(s socketio.Conn) string {last := s.Context().(string)s.Emit("bye", last)s.Close()return last})server.OnError("/", func(s socketio.Conn, e error) {log.Println("meet error:", e)})server.OnDisconnect("/", func(s socketio.Conn, msg string) {log.Println("closed", msg)})go func() {if err := server.Serve(); err != nil {log.Fatalf("socketio listen error: %s\n", err)}}()defer server.Close()router.Use(GinMiddleware("http://localhost:3000"))router.GET("/socket.io/*any", gin.WrapH(server))router.POST("/socket.io/*any", gin.WrapH(server))router.StaticFS("/public", http.Dir("../asset/index.html"))if err := router.Run(":8000"); err != nil {log.Fatal("failed run app: ", err)}}
我的前端代码如下所示：
<!doctype html><html><head><title>Socket.IO chat</title><style>* { margin: 0; padding: 0; box-sizing: border-box; }body { font: 13px Helvetica, Arial; }form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }#messages { list-style-type: none; margin: 0; padding: 0; }#messages li { padding: 5px 10px; }#messages li:nth-child(odd) { background: #eee; }</style></head><body><ul id="messages"></ul><form action=""><input id="m" autocomplete="off" /><button>Send</button></form><script src="https://cdn.socket.io/socket.io-1.4.5.js"></script><script src="https://code.jquery.com/jquery-1.11.1.js"></script><script>var socket = io();var s2 = io("/chat");socket.on('reply', function(msg){$('#messages').append($('<li>').text(msg));});$('form').submit(function(){s2.emit('msg', $('#m').val(), function(data){$('#messages').append($('<li>').text('ACK CALLBACK: ' + data));});socket.emit('notice', $('#m').val());$('#m').val('');return false;});</script></body></html>
但是当我在浏览器中运行代码，访问URL：http://localhost:8000/socket.io/ 时，我收到以下错误信息：
invalid transport: %!s(<nil>)
为什么会出现这个错误？我尝试了一些来自以下网站的提示：
https://socket.io/docs/v3/troubleshooting-connection-issues/
但是没有任何方法对我有帮助。
英文:
I'm trying to use the go-socket.io library to build an online chat with golang
so I made a simple structure, following the examples in the documentation
my main.go looks like this:
package mainimport ("log""net/http""github.com/gin-gonic/gin"socketio "github.com/googollee/go-socket.io")func GinMiddleware(allowOrigin string) gin.HandlerFunc {return func(c *gin.Context) {c.Writer.Header().Set("Access-Control-Allow-Origin", allowOrigin)c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT, DELETE")c.Writer.Header().Set("Access-Control-Allow-Headers", "Accept, Authorization, Content-Type, Content-Length, X-CSRF-Token, Token, session, Origin, Host, Connection, Accept-Encoding, Accept-Language, X-Requested-With")if c.Request.Method == http.MethodOptions {c.AbortWithStatus(http.StatusNoContent)return}c.Request.Header.Del("Origin")c.Next()}}func main() {router := gin.New()server := socketio.NewServer(nil)server.OnConnect("/", func(s socketio.Conn) error {s.SetContext("")log.Println("connected:", s.ID())return nil})server.OnEvent("/", "notice", func(s socketio.Conn, msg string) {log.Println("notice:", msg)s.Emit("reply", "have "+msg)})server.OnEvent("/chat", "msg", func(s socketio.Conn, msg string) string {s.SetContext(msg)return "recv " + msg})server.OnEvent("/", "bye", func(s socketio.Conn) string {last := s.Context().(string)s.Emit("bye", last)s.Close()return last})server.OnError("/", func(s socketio.Conn, e error) {log.Println("meet error:", e)})server.OnDisconnect("/", func(s socketio.Conn, msg string) {log.Println("closed", msg)})go func() {if err := server.Serve(); err != nil {log.Fatalf("socketio listen error: %s\n", err)}}()defer server.Close()router.Use(GinMiddleware("http://localhost:3000"))router.GET("/socket.io/*any", gin.WrapH(server))router.POST("/socket.io/*any", gin.WrapH(server))router.StaticFS("/public", http.Dir("../asset/index.html"))if err := router.Run(":8000"); err != nil {log.Fatal("failed run app: ", err)}}
my front end looks like this:
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-html -->
<!doctype html><html><head><title>Socket.IO chat</title><style>* { margin: 0; padding: 0; box-sizing: border-box; }body { font: 13px Helvetica, Arial; }form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }#messages { list-style-type: none; margin: 0; padding: 0; }#messages li { padding: 5px 10px; }#messages li:nth-child(odd) { background: #eee; }</style></head><body><ul id="messages"></ul><form action=""><input id="m" autocomplete="off" /><button>Send</button></form><script src="https://cdn.socket.io/socket.io-1.4.5.js"></script><script src="https://code.jquery.com/jquery-1.11.1.js"></script><script>var socket = io();var s2 = io("/chat");socket.on('reply', function(msg){$('#messages').append($('<li>').text(msg));});$('form').submit(function(){s2.emit('msg', $('#m').val(), function(data){$('#messages').append($('<li>').text('ACK CALLBACK: ' + data));});socket.emit('notice', $('#m').val());$('#m').val('');return false;});</script></body></html>
<!-- end snippet -->
but when running the code in the browser, by the url: http://localhost:8000/socket.io/
i get this error:
invalid transport: %!s(<nil>)
why?
I tried to use some tips from this site:
https://socket.io/docs/v3/troubleshooting-connection-issues/
but no alternative helped me
答案1
得分: 1
除了@code_monk指出的问题之外，下面的代码也是错误的：
router.StaticFS("/public", http.Dir("../asset/index.html"))
正如其名称所示，http.Dir是一个目录而不是一个文件，所以正确的代码应该是：
router.StaticFS("/public", http.Dir("../asset"))
在浏览器中打开的URL是：http://localhost:8080/public/。
如果你想提供单个文件，可以使用StaticFile：
router.StaticFile("/", "../asset/index.html")
在浏览器中打开的URL是：http://localhost:8080/。
还要注意../asset。也许你的意思是./asset（取决于你的文件目录结构）。
英文:
Besides the issue pointed out by @code_monk, the following code is incorrect too:
router.StaticFS("/public", http.Dir("../asset/index.html"))
As the name implies, http.Dir is a directory instead of a file, so the correct code should be:
router.StaticFS("/public", http.Dir("../asset"))
And the URL to open in the browser is: http://localhost:8080/public/.
If you want to serve a single file, you can use StaticFile instead:
router.StaticFile("/", "../asset/index.html")
And the URL to open in the browser is: http://localhost:8080/.
Pay attention to ../asset too. Maybe you mean ./asset (depends on the directory structure of your files).
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