reorganization of _examples and add some new examples such as iris+groupcache+mysql+docker

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/routing/subdomains/www/main_test.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/kataras/iris/v12/httptest"
+)
+
+type testRoute struct {
+	path      string
+	method    string
+	subdomain string
+}
+
+func (r testRoute) response() string {
+	msg := fmt.Sprintf("\nInfo\n\nMethod: %s\nSubdomain: %s\nPath: %s", r.method, r.subdomain, r.path)
+	return msg
+}
+
+func TestSubdomainWWW(t *testing.T) {
+	app := newApp()
+
+	tests := []testRoute{
+		// host
+		{"/", "GET", ""},
+		{"/about", "GET", ""},
+		{"/contact", "GET", ""},
+		{"/api/users", "GET", ""},
+		{"/api/users/42", "GET", ""},
+		{"/api/users", "POST", ""},
+		{"/api/users/42", "PUT", ""},
+		// www sub domain
+		{"/", "GET", "www"},
+		{"/about", "GET", "www"},
+		{"/contact", "GET", "www"},
+		{"/api/users", "GET", "www"},
+		{"/api/users/42", "GET", "www"},
+		{"/api/users", "POST", "www"},
+		{"/api/users/42", "PUT", "www"},
+	}
+
+	host := "localhost:1111"
+	e := httptest.New(t, app, httptest.Debug(false))
+
+	for _, test := range tests {
+
+		req := e.Request(test.method, test.path)
+		if subdomain := test.subdomain; subdomain != "" {
+			req.WithURL("http://" + subdomain + "." + host)
+		}
+
+		req.Expect().
+			Status(httptest.StatusOK).
+			Body().Equal(test.response())
+	}
+}