added some mini exercises

web/07/mini_exercises/demo2.go

@@ -0,0 +1,19 @@
+package main
+
+import "net/http"
+
+type respExampleHandler int //typ ist egal => interface wichtig!!
+
+func (hello respExampleHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) { //Bedienung
+	w.Header().Set("custom_header", "Beleibiger Text")
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	w.WriteHeader(http.StatusFound)
+	w.Write([]byte("<h1> Dies ist eine HTML-Ueberschrift</h1>"))
+
+}
+
+func main() {
+	var r respExampleHandler
+
+	http.ListenAndServe("localhost:8080", r) //Türsteher
+}

web/07/mini_exercises/demo_helloworld.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type helloHandler int
+
+func (hello helloHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "Hello World %d", hello)
+}
+
+func _main() {
+	var world helloHandler
+	world = 42
+	http.ListenAndServe("localhost:8080", world)
+}