public Uri uri { get; set; }

The passed URI must be a full and absolute URI.

This property can't be set after calling UnityWebRequest.SendWebRequest.

If the UnityWebRequest encounters and follows redirects, this property updates with the URL to which the UnityWebRequest was redirected.

This property works like _url but is faster to set because it requires less validation and pre-processing. However, each time you access its value, a new URI instance is created, which is resource-intensive. The recommended best practice is to use this property when you need a URI object and to use _url when you need a resulting URL.