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

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/request-body/read-xml/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"encoding/xml"
+
+	"github.com/kataras/iris/v12"
+)
+
+func main() {
+	app := newApp()
+
+	// use Postman or whatever to do a POST request
+	// to the http://localhost:8080 with RAW BODY:
+	/*
+		<person name="Winston Churchill" age="90">
+			<description>Description of this person, the body of this inner element.</description>
+		</person>
+	*/
+	// and Content-Type to application/xml (optionally but good practise)
+	//
+	// The response should be:
+	// Received: main.person{XMLName:xml.Name{Space:"", Local:"person"}, Name:"Winston Churchill", Age:90, Description:"Description of this person, the body of this inner element."}
+	app.Listen(":8080", iris.WithOptimizations)
+}
+
+func newApp() *iris.Application {
+	app := iris.New()
+	app.Post("/", handler)
+
+	return app
+}
+
+// simple xml stuff, read more at https://golang.org/pkg/encoding/xml
+type person struct {
+	XMLName     xml.Name `xml:"person"`      // element name
+	Name        string   `xml:"name,attr"`   // ,attr for attribute.
+	Age         int      `xml:"age,attr"`    // ,attr attribute.
+	Description string   `xml:"description"` // inner element name, value is its body.
+}
+
+func handler(ctx iris.Context) {
+	var p person
+	if err := ctx.ReadXML(&p); err != nil {
+		ctx.StopWithError(iris.StatusBadRequest, err)
+		return
+	}
+
+	ctx.Writef("Received: %#+v", p)
+}