Set the default hostname to "0.0.0.0" from "127.0.0.1" - as golang's net.Listener does by default

I changed that because some guys has problems in their hosting machines,
and they should use the "127.0..0.1" instead of "0.0.0.0", if you have
problems just pass `iris.Listen("127.0.0.1:8080") instead of
`iris.Listen(":8080")`

config/server.go

@@ -11,8 +11,8 @@ import (
 
 // Default values for base Server conf
 const (
-	// DefaultServerHostname returns the default hostname which is 127.0.0.1
-	DefaultServerHostname = "127.0.0.1"
+	// DefaultServerHostname returns the default hostname which is 0.0.0.0
+	DefaultServerHostname = "0.0.0.0"
 	// DefaultServerPort returns the default port which is 8080
 	DefaultServerPort = 8080
 	// DefaultMaxRequestBodySize is 8MB
@@ -37,7 +37,7 @@ const (
 )
 
 var (
-	// DefaultServerAddr the default server addr which is: 127.0.0.1:8080
+	// DefaultServerAddr the default server addr which is: 0.0.0.0:8080
 	DefaultServerAddr = DefaultServerHostname + ":" + strconv.Itoa(DefaultServerPort)
 )
 

context.go

@@ -238,9 +238,14 @@ func (ctx *Context) VirtualHostname() string {
 	}
 	if idxDotAnd := strings.LastIndexByte(hostname, '.'); idxDotAnd > 0 {
 		s := hostname[idxDotAnd:]
+		// means that we have the request's host mymachine.com or 127.0.0.1/0.0.0.0, but for the second option we will need to replace it with the hostname that the dev was registered
+		// this needed to parse correct the {{ url }} iris global template engine's function
 		if s == ".1" {
 			hostname = strings.Replace(hostname, "127.0.0.1", virtualhost, 1)
+		} else if s == ".0" {
+			hostname = strings.Replace(hostname, "0.0.0.0", virtualhost, 1)
 		}
+		//
 	} else {
 		hostname = strings.Replace(hostname, "localhost", virtualhost, 1)
 	}

http.go

@@ -1309,7 +1309,7 @@ type (
 		api           *muxAPI
 		errorHandlers map[int]Handler
 		logger        *logger.Logger
-		// the main server host's name, ex:  localhost, 127.0.0.1, iris-go.com
+		// the main server host's name, ex:  localhost, 127.0.0.1, 0.0.0.0, iris-go.com
 		hostname string
 		// if any of the trees contains not empty subdomain
 		hosts bool
@@ -1328,7 +1328,7 @@ func newServeMux(contextPool sync.Pool, logger *logger.Logger) *serveMux {
 		cPool:         &contextPool,
 		lookups:       make([]*route, 0),
 		errorHandlers: make(map[int]Handler, 0),
-		hostname:      "127.0.0.1",
+		hostname:      config.DefaultServerHostname, // these are changing when the server is up
 		escapePath:    !config.DefaultDisablePathEscape,
 		correctPath:   !config.DefaultDisablePathCorrection,
 		logger:        logger,

http_test.go

@@ -73,7 +73,7 @@ func TestServerHost(t *testing.T) {
 	var server1, server2, server3 Server
 	var expectedHost1 = "mydomain.com:1993"
 	var expectedHost2 = "mydomain.com:80"
-	var expectedHost3 = "127.0.0.1:9090"
+	var expectedHost3 = config.DefaultServerHostname + ":9090"
 	server1.Config.ListeningAddr = expectedHost1
 	server2.Config.ListeningAddr = "mydomain.com"
 	server3.Config.ListeningAddr = ":9090"