Defines the target URI for the UnityWebRequest to communicate with.
The passed Uri must be full absolute URI.
Send を呼び出した後、このプロパティーは設定できません。
[UnityWebRequest]] が発生し、リダイレクトに続く場合、このプロパティーは UnityWebRequest のリダイレクト先となる URL で更新します。
Same as url, but has less validation and pre-processing, so is much faster to set. Reading it's value is, however, more expensive because the new Uri instance is created, so if you want to get the URL your request ended up to, it's recommended to use url, unless an Uri object is what you need.