diff --git a/index.js b/index.js
index 8e2d6d3..55f5cda 100644
--- a/index.js
+++ b/index.js
@@ -52,6 +52,10 @@ router.get("/", async (ctx) => {
   s.push(`Got request to screenshot ${params.url}<pre>`);
   const id = uuid();
   let docker_id = "";
+  if (!params.url) {
+    ctx.body = "specify url!";
+    return;
+  }
   const starter = spawn(
     "docker",
     [
@@ -62,7 +66,7 @@ router.get("/", async (ctx) => {
       `${process.cwd()}/static:/opt/static`,
       "headless-fox",
       "./script3.sh",
-      '{"url": "pearson.pl", "third_party_domains": ["hotjar.com", "cookielaw.org"]}',
+      `{"url": "${params.url}", "third_party_domains": ["hotjar.com", "cookielaw.org", "facebook.com"]}`,
       id,
     ],
     { cwd: process.cwd() }