notice for safe use and licensing changes (#16)

Author: Shivam010

README.md

@@ -1,3 +1,7 @@
+> Note: This repository and project is for educational and testing purposes only, any illegal or bad use of project or its hosted service `https://non-cors.herokuapp.com` is solely the responsibility of the users using it. Me or the contributors has nothing to do with that.
+
+> Also, the hosted service https://non-cors.herokuapp.com has been disabled for now, for safety. Sorry for any inconvenience.
+
 # bypass-cors 
 >a proxy server to bypass CORS (Cross-Origin Resource Sharing) enabled servers
 
@@ -37,4 +41,3 @@ Please make your changes in a specific branch and request to pull into master! I
 
 ### License
 The application, its design and its code all are licensed under the [MIT license.](https://github.com/Shivam010/bypass-cors/blob/master/LICENSE)
- 

helper.go

@@ -20,7 +20,7 @@ type Valuer interface {
 func Return(w http.ResponseWriter, res Valuer) {
 	fmt.Printf("Served with: %d-%v \n", res.StatusCode(), http.StatusText(res.StatusCode()))
 
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	//w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	w.WriteHeader(res.StatusCode())
 	_, _ = fmt.Fprintln(w, res.Value())
 }

license.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"net/http"
+	"strings"
+)
+
+const (
+	licenseKey = "license"
+	licenseLen = len(licenseKey)
+	licenseUrl = "https://github.com/Shivam010/bypass-cors/blob/master/LICENSE"
+)
+
+func License(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add(licenseKey, licenseUrl)
+		r.Header.Add(licenseKey, licenseUrl)
+		path := strings.ToLower(r.URL.Path)
+		// redirect to license if URL path is "/license*"
+		if len(path) > licenseLen && path[1:licenseLen+1] == licenseKey {
+			http.Redirect(w, r, licenseUrl, http.StatusPermanentRedirect)
+			return
+		}
+		h.ServeHTTP(w, r)
+		w.Header().Add(licenseKey, licenseUrl)
+		r.Header.Add(licenseKey, licenseUrl)
+	})
+}

main.go

@@ -107,7 +107,7 @@ func main() {
 
 	fmt.Printf("\nStarting Proxy ByPass-Cors Server at port(:%v)...\n\n", PORT)
 
-	if err := http.ListenAndServe(":"+PORT, &handler{}); err != nil {
+	if err := http.ListenAndServe(":"+PORT, License(&handler{})); err != nil {
 		log.Println("\n\nPanics", err)
 	}
 }