Async task for Unity in C#

1. Create a new object: AsyncTask asyncTask = gameObject.AddComponent<AsyncTask>();
2. Set your URL: SetUrl
3. (Optional) Add query parameters: AddQueryParams
4. (Optional) Set the code you want to run before sending WWW request: Before
5. (Optional) Set the code to do with the progress: Progress
6. (Optional) Set your callback: After
7. Start the task: Start