come_at_me.go

package comeatme

import (
	"code.google.com/p/google-api-go-client/plus/v1"
	"net/http"
)

type SimpleKeyTransport struct {
	Key       string
	Transport http.RoundTripper
}

func (t *SimpleKeyTransport) RoundTrip(r *http.Request) (*http.Response, error) {
	q := r.URL.Query()
	q.Set("key", t.Key)
	r.URL.RawQuery = q.Encode()
	return t.Transport.RoundTrip(r)
}

func main() {
	// ...
	t := &SimpleKeyTransport{Key: key, Transport: http.DefaultTransport}
	client, err := plus.New(&http.Client{Transport: t})
	if err != nil {
		return nil, err
	}
	p, err := client.People.Get("116810148281701144465").Do()
	// ...
}