# FastAPI
ASGI interface
(gunicorn is WSGI like Flask)

## Contains
- OpenAPI / SwaggerUI
- Pydantic
- SQLAlchemy (ORM)

## Document of OpenAPI
### /docs
- SwaggerUI interface
### /openapi.json
- OpenAPI standard json format

## Path parameter
#### path part of reauest URI
- /book/book_1

## variable in path will become "Path parameter"

@app.get("/{book_name}")
async def read_book(book_name: str):
    return BOOKS[book_name]

### path order is important
1. /book/mybook
2. /book/{book_name}

order must be 1 -> 2
or if the order is 2 -> 1 , it will go in to 2 and never go in to 1

## Query parameter
query part of reauest URI
- /book?book_id=2

## variable not in path will become "Query parameter"

@app.get("/")
async def read_book(book_name: str):
    return BOOKS[book_name]

## Enum
use Enum as param type can show as input box in swaggerUI

# Pydantic

## action items
- Async test
- IT 所有api文件整合