update section54, 55

_chapter14/section54/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+)
+
+func main() {
+	err := http.ListenAndServe(
+		":18080",
+		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			fmt.Fprintf(w, "Hello, %s!", r.URL.Path[1:])
+		}),
+	)
+	if err != nil {
+		fmt.Printf("failed to terminate server: %v", err)
+		os.Exit(1)
+	}
+}

_chapter14/section55/main.go

@@ -0,0 +1,5 @@
+package section55
+
+func main() {
+
+}

_chapter14/section55/main_test.go

@@ -0,0 +1,7 @@
+package section55
+
+import "testing"
+
+func TestMain(m *testing.M) {
+	go main()
+}