# Challenge Name : Reference
>What is your reference again?
When we visit the address, We get this nice "welcoming" page.
Digging through the HTML Document we find a script tag linking `/js/index.js`
Upon primitive inspection it's an ajax function which returns success and possibly flag or failure based on request to url `/check_from_google`.
Inferring from the challenge title and from the url name `/check_from_google` we have to set the [HTTP Referer](https://en.wikipedia.org/wiki/HTTP_referer) field in request header to url `/check_from_google`.
Fire up burp suite, capture the request and add a referer field with `www.google.com` as the value.
We get a base64 string as response. Decoding it, gives us the flag.
The flag is :