reCAPTCHA: Missing POST response for 'g-recaptcha-response'

1
votes

We have a live reCaptcha v2 implementation at the following URL:

https://och.stonybrook.edu/index.php?page=roommates&task=submit

The reCaptcha has been working fine until reported to me as not working today.

I have identified the following:

  • The reCaptcha JS is loading successfully
  • The reCaptcha is working well on the form -- creating the element, checking the box and adding an encrypted string to the g-recaptcha-response textarea element that is created by the library.
  • However, on the server I am seeing no value for $_POST['g-recaptcha-response']
  • When I var_dump the $_POST array in PHP, I see all other form values but not this one. It does not exist as an index in the $_POST array

I have:

  • Verified domain in reCAPTCHA admin
  • Created a new site/secret key pair
  • Tried the test key pair provided by Google via the docs

I can't get to the bottom of why that <textarea> is not posting its data to the server.

I have crawled the docs at https://developers.google.com/recaptcha/docs/verify to no avail.

HTML:

<!-- Using the Auto Render implementation as described in 
https://developers.google.com/recaptcha/docs/display#auto_render -->

<!-- in <head> -->
<script src="https://www.google.com/recaptcha/api.js"></script>

<!-- in <form> -->
<div class="g-recaptcha" data-sitekey="SITE_KEY"></div>

PHP:

echo($_POST['g-recaptcha-response']); //outputs nothing

var_dump($_POST); //outputs all of my form values, except for <textarea id="g-recaptcha-response">
1
javascriptphprecaptcha
We can't see your code from here... – Felippe Duarte
we also can't see the page at that URL in the link, gets redirect to a login page instead – ADyson
I have removed the authentication. Try now. – Josh Palmeri

1 Answers

1
votes

The form is most likely malformed e.g. mis-matched HTML tags. Inspect within chrome and make sure the form wraps around the captcha textarea.