Merge pull request #19 from Fangliding/main

Add path check

index.js

@@ -4,6 +4,7 @@ const doh = 'https://security.cloudflare-dns.com/dns-query'
 const dohjson = 'https://security.cloudflare-dns.com/dns-query'
 const contype = 'application/dns-message'
 const jstontype = 'application/dns-json'
+const path = ''; // default allow all, must start with '/' if specified, eg. "/dns-query"
 const r404 = new Response(null, {status: 404});
 
 // developers.cloudflare.com/workers/runtime-apis/fetch-event/#syntax-module-worker
@@ -18,7 +19,12 @@ async function handleRequest(request) {
     // blog.cloudflare.com/workers-optimization-reduces-your-bill
     let res = r404;
     const { method, headers, url } = request
-    const searchParams = new URL(url).searchParams
+    const {searchParams, pathname} = new URL(url)
+
+    //Check path
+    if (!pathname.startsWith(path)) {
+        return r404;
+    }
     if (method == 'GET' && searchParams.has('dns')) {
         res = fetch(doh + '?dns=' + searchParams.get('dns'), {
             method: 'GET',