http.go
func (c *Client) RequestOnBehalfOf(subaccountSid string) {
	c.FullPath = func(pathPart string) string {
		return "/" + strings.Join([]string{c.APIVersion, "Accounts", subaccountSid, pathPart + ".json"}, "/")
	}
}
func (c *Client) RequestOnBehalfOf(subaccountSid string) {
	c.FullPath = func(pathPart string) string {
		return "/" + strings.Join([]string{c.APIVersion, "Accounts", subaccountSid, pathPart + ".json"}, "/")
	}
}
// RequestOnBehalfOf will make all future client requests using the same
// Account Sid and Auth Token for Basic Auth, but will use the provided
// subaccountSid in the URL. Use this to make requests on behalf of a
// subaccount, using the parent account's credentials.
//
// RequestOnBehalfOf is *not* thread safe, and modifies the Client's behavior
// for all requests going forward.
//
// RequestOnBehalfOf should only be used with api.twilio.com, not (for example)
// Twilio Monitor.
//
// To authenticate using a subaccount sid / auth token, create a new Client
// using that account's credentials.