I am doing a Java (JSP + Servlet) web application (I understand that this question is technology-independent). I hope to use the latest Goolge reCAPTCHA service.
I am playing with a Goolge reCAPTCHA example found here:
https://developers.google.com/recaptcha/docs/display#config
<html>
<head>
<title>reCAPTCHA demo: Simple page</title>
<script src="https://www.google.com/recaptcha/api.js" async defer></script>
</head>
<body>
<form action="?" method="POST">
<div class="g-recaptcha" data-sitekey="my_site_key"></div>
<br/>
<input type="submit" value="Submit">
</form>
</body>
</html>
I am able to see the displayed recaptcha image as follows:
When I check "I'm not a robot", I get the following:
As you can see, there is a Verify button and based on my tests, user response is sent to Google for verification.
How can I get the user response so that I can verify user response in my own backend code (as suggested by Google at https://developers.google.com/recaptcha/docs/verify).
g-recaptcha-response POST parameter when the user submits the form on your site
On the server side, I can, by clicking on the "Submit" button, get user input from parameter "g-recaptcha-response" only when a user is verified successfully with Google first. Otherwise, "g-recaptcha-response" is blank on the server side. This means that I can do server-side verification only after the client-side's verification success. If so, what is the point of doing another verification on the server-side, which is the option provided by Google reCAPTHA?
Do I missing anything?
The cool thing about the new Google Recaptcha is that the validation is now completely encapsulated in the widget. That means, that the widget will take care of asking questions, validating responses all the way till it determines that a user is actually a human, only then you get a g-recaptcha-response value.
But that does not keep your site safe from HTTP client request forgery.
Anyone with HTTP POST knowledge could put random data inside of the g-recaptcha-response form field, and foll your site to make it think that this field was provided by the google widget. So you have to validate this token.
In human speech it would be like,
Validating the response is really easy. Just make a GET Request to
And replace the response_string with the value that you earlier got by the g-recaptcha-response field.
You will get a JSON Response with a success field.
More information here: https://developers.google.com/recaptcha/docs/verify
Edit: It's actually a POST, as per documentation here.