ipv4 vs ipv6

[misterunix]

Issue Description on most dual stack machines only ipv6 will bind as a listener.

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs

Expected behaviour

bind to ipv4 ports

Actual behaviour

binds only to ipv6 ports

Steps to reproduce

Compile the example code and check listening ports. Only ipv6 will be listening.

Working code to debug

package main

import (
    "net/http"

    "github.com/labstack/echo"
    "github.com/labstack/echo/middleware"
)

  // Handler
  func hello(c echo.Context) error {
    return c.String(http.StatusOK, "Hello, World!")
}

func main() {
    // Echo instance
    e := echo.New()

    // Middleware
    e.Use(middleware.Logger())
    e.Use(middleware.Recover())

    // Routes
    e.GET("/", hello)

    // Start server
    e.Logger.Fatal(e.Start(":1323"))
}

The work around: in 'echo.go' change "tcp" to "tcp4"

func newListener(address string) (*tcpKeepAliveListener, error) {
        l, err := net.Listen("tcp", address)
        if err != nil {
                return nil, err
        }
        return &tcpKeepAliveListener{l.(*net.TCPListener)}, nil
}

Version/commit

[pafuent]

I uploaded #1667 to fix this issue