feat: compare on GET requests with non-empty query string

Also add a /about page so there's a non-root page that does not return
404.

main.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"time"
 
 	"gopkg.in/alecthomas/kingpin.v2"
 )
@@ -44,13 +45,26 @@ Case-insensitive string comparison, as an API. Because ¯\_(ツ)_/¯
 
 Example usage:
 curl -X POST -F "a=Foo Bar" -F "b=FOO BAR" %s://%s/
-curl -X POST "%s://%s/?a=Foo+Bar&b=FOO+BAR"`,
+curl -X GET "%s://%s/?a=Foo+Bar&b=FOO+BAR"
+`,
 		name, version, scheme, r.Host, scheme, r.Host)
 	if err != nil {
 		log.Fatal(err)
 	}
 }
 
+func aboutHandler(w http.ResponseWriter, _ *http.Request) {
+	_, err := fmt.Fprintf(w,
+		`%s %s
+
+https://github.com/jimeh/casecmp
+`,
+		name, version)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
 func casecmpHandler(w http.ResponseWriter, r *http.Request) {
 	a := r.FormValue("a")
 	b := r.FormValue("b")
@@ -59,22 +73,24 @@ func casecmpHandler(w http.ResponseWriter, r *http.Request) {
 	if strings.EqualFold(string(a), string(b)) {
 		resp = "1"
 	}
-	_, err := fmt.Fprintf(w, resp)
+	_, err := fmt.Fprint(w, resp)
 	if err != nil {
 		log.Fatal(err)
 	}
 }
 
-func rootHandler(w http.ResponseWriter, r *http.Request) {
-	if r.URL.Path != "/" {
-		http.NotFound(w, r)
-		return
-	}
-
-	if r.Method == "GET" {
+func handler(w http.ResponseWriter, r *http.Request) {
+	switch r.URL.Path {
+	case "/":
+		if r.Method != "GET" || r.URL.RawQuery != "" {
+			casecmpHandler(w, r)
+			return
+		}
 		indexHandler(w, r)
-	} else {
-		casecmpHandler(w, r)
+	case "/about":
+		aboutHandler(w, r)
+	default:
+		http.NotFound(w, r)
 	}
 }
 
@@ -90,8 +106,6 @@ func printVersion() {
 }
 
 func startServer() {
-	http.HandleFunc("/", rootHandler)
-
 	if *portFlag == "" {
 		envPort := os.Getenv("PORT")
 		if envPort != "" {
@@ -107,7 +121,15 @@ func startServer() {
 
 	address := *bindFlag + ":" + *portFlag
 	fmt.Printf("Listening on %s\n", address)
-	log.Fatal(http.ListenAndServe(address, nil))
+	srv := &http.Server{
+		ReadTimeout:  5 * time.Second,
+		WriteTimeout: 5 * time.Second,
+		IdleTimeout:  30 * time.Second,
+		Handler:      http.HandlerFunc(handler),
+		Addr:         address,
+	}
+
+	log.Fatal(srv.ListenAndServe())
 }
 
 func main() {