gitlab-org--gitlab-foss/doc/integration/recaptcha.md

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# reCAPTCHA
GitLab leverages [Google's reCAPTCHA](https://www.google.com/recaptcha/intro/index.html)
to protect against spam and abuse. GitLab displays the CAPTCHA form on the sign-up page
to confirm that a real user, not a bot, is attempting to create an account.
## Configuration
To use reCAPTCHA, first you must create a site and private key.
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1. Go to the URL: <https://www.google.com/recaptcha/admin>.
1. Fill out the form necessary to obtain reCAPTCHA keys.
1. Login to your GitLab server, with administrator credentials.
1. Go to Applications Settings on Admin Area (`admin/application_settings`).
1. Fill all recaptcha fields with keys from previous steps.
1. Check the `Enable reCAPTCHA` checkbox.
1. Save the configuration.
## Enabling reCAPTCHA for user logins via passwords
By default, reCAPTCHA is only enabled for user registrations. To enable it for
user logins via passwords, the `X-GitLab-Show-Login-Captcha` HTTP header must
be set. For example, in NGINX, this can be done via the `proxy_set_header`
configuration variable:
```
proxy_set_header X-GitLab-Show-Login-Captcha 1;
```
In GitLab Omnibus, this can be configured via `/etc/gitlab/gitlab.rb`:
```ruby
nginx['proxy_set_headers'] = { 'X-GitLab-Show-Login-Captcha' => 1 }
```