====== LiteStar install ======

  * python -m pip install litestar
  * once, done, you can run in the project dir, (where app.py is) <code>litestar run</code>
    * if error module missing, just pip install those
      * rich
      * click
      * uvicorn
      * jsbeautifier

====== LiteStar syntax ======

  * after build a simple api, to interact with that web api, sample code
    * get <code python>response = requests.get("http://127.0.0.1:8000/?done=true")</code>
    * post <code python>response = requests.post("http://127.0.0.1:8000/",json={"title":"car-washing","done":False})</code>
    * put <code python>response = requests.put("http://127.0.0.1:8000/profiting", json={"title":"profiting2","done":True}</code>
    * read <code>data = response.json()</code>

  * note: 
    * in json, true is "true"
    * in python, true is "True"
    * in http url, true is ok with "true" or "True"

====== Concepts ======

  * it provides a active server, allow other pc or program to communicate with it
  * it use url to point to each function of the app.py <code python>
# (python decorator: a function repackage method, put below function as a component of decorator function)
# so, the decoration function is like a white-label procedure function, need input function as lego part to output different behaved white-label funciton. 
@get("/")
async def func_a() -> str:

# same as below, get("/") return a the get white-label function, and take func_a as component to output a different behaved white-label function, and use the same function variable func_a, (like a repackage of func_a in white-label box)
func_a = get("/")(func_a)
</code>

  * ASGI: Asynchronous Server Gateway Interface
    * newer for python, non block commu
  * WSGI: Web Server Gateway Interface

  * litestar use Uvicorn ASGI server, which support http, websockets and other realtime protocol
    * https://www.uvicorn.org/

  * litestar auto create the scheme and scheme tryout page
    * http://127.0.0.1:8000/schema/
    * http://127.0.0.1:8000/schema/swagger
    * Litestar generates an OpenAPI schema based on the route handlers, which can then be used by Swagger to set up the interactive documentation.