How can I use the Gerrit REST API?

The Gerrit REST API is open for queries by default on all Software Factory deployments. There is an extensive documentation available online:

https://gerrit-review.googlesource.com/Documentation/rest-api.html

The Gerrit API is available at the https://fqdn/r/ endpoint for non authenticated requests and for authenticated requests it is https://fqdn/r/a/.

To use the authenticated endpoint you have to create an API password first. To do so, go to the User Settings page (upper right corner on the top menu) and click on the button Generate new API key.

For example, getting open changed with cURL would be:

curl "http://fqdn/r/changes/?q=status:open"

And to access a restricted resources with cURL would be:

curl -u username:apikey https://fqdn/r/a/accounts/self/password.http