This is a simple HTTP server which creates the reCaptcha form and tests the input.
Build the example after installing the recaptcha package:
go get github.com/dpapathanasiou/go-recaptcha
go build example.go
Run the server by invoking the executable:
./example <reCaptcha public key> <reCaptcha private key>
You can access the page from http://localhost:9001/ in your browser.
For more information on client side setup and other configuration options, check the official documentation.