UnityWebRequest Dispose example

ServerRequestManager.cs

private IEnumerator ExecuteRequest<T>(BuildRequestDelegate builder, ResponseDelegate<T> callback,
	Action cancelCallback, RequestOptions requestOptions)
{
	using(UnityWebRequest serverRequest = builder())
	{
		bool showActivityIndicator = ((requestOptions & RequestOptions.ShowActivityIndicator) == RequestOptions.ShowActivityIndicator);
		bool forceRetry = ((requestOptions & RequestOptions.ForceRetry) == RequestOptions.ForceRetry);

		float startTime = Time.realtimeSinceStartup;
		yield return serverRequest.Send();
		this.LastResponseTime = (int)((Time.realtimeSinceStartup - startTime) * 1000);

		if(serverRequest.isError)
		{
			LogError(serverRequest.error);

			DisplayErrorMessage("Communication Error", serverRequest.error, true, () => {
				StartCoroutine(ExecuteRequest(builder, callback, null, requestOptions));
			}, null);

			yield break;
		}
		else
		{
			string responseString = serverRequest.downloadHandler.text;

			if((requestOptions & RequestOptions.SuppressLogging) != RequestOptions.SuppressLogging)
			{
				Log("API response: {0}", responseString);
			}

			try
			{
				Dictionary<string, JToken> response = JsonConvert.DeserializeObject<Dictionary<string, JToken>>(responseString);

				if(response.ContainsKey("error"))
				{
					LogErrorWithoutFormatting(string.Join("\n", response["error"].Values<string>().ToArray()));

					DisplayErrorMessage("Server Error", response["message"].ToString(), forceRetry, () => {
						StartCoroutine(ExecuteRequest(builder, callback, cancelCallback, requestOptions));
					}, cancelCallback);
				}
				else
				{
					T result = response["data"].ToObject<T>();

					if(callback != null)
					{
						callback(result);
					}
				}
			}
			catch(JsonReaderException e)
			{
				LogError("Error reading response data. Possibly malformed data: {0}", e.Message);

				DisplayErrorMessage("Server Error", e.Message, true, () => {
					StartCoroutine(ExecuteRequest(builder, callback, cancelCallback, requestOptions));
				}, cancelCallback);
			}
		}
	}
}

A few things to note here: BuildRequestDelegate is just a normal C# delegate around a call to new UnityWebRequest(). We do that just to enable a "Retry" button in an alert popup (shown in DisplayErrorMessage()) to re-issue the entire request if the initial request fails. The implicit call to UnityWebRequest#Dispose happens by virtue of wrapping the entire block in the using statement, and we invoke callback with a typed response delegate (e.g., if we're requesting the player's name, the ResponseDelegate used for that callback might be simply a class that has a string property called Name).

I haven't tried invoking the callback outside of UnityWebRequest's using block, but maybe there's something to that? I'm not sure.