HIGH PERFORMANCE WEB APPS WITH FASTAPI : the asynchronous web framework based on modern python

Build APIs and web apps based on Asynchronous Server Gateway Interface (ASGI). This book provides a comprehensive explanation of using Pydantic models to construct the request/response objects in a FASTAPI path operation. You’ll start by reviewing type hints in Python and the asynchronous processing concepts. One of the highlights of FastAPI is its auto generation of API docs. Pydantic library is the main pillar on top of which FastAPI is built. You’ll see that ASGI has a far better performance compared to most of the other popular Python frameworks as they implement Web server Gateway Interface (WSGI), which is synchronous in nature and hence having slower response time. This book thoroughly explains how FastAPI interacts asynchronously with relational as well as NOSQL databases. Modern web apps use template engines to interact with the front-end. In this book, you will learn to use jinja2 templates and static assets. Swagger UI and OpenAPI standards are also covered in detail. Finally, different options of deployment of FastAPI app have been explored in this book. This book uses practical examples to empower you to build high performance APIs What You'll Learn Develop robust and high-performance web apps Deploy the FastAPI app for public availability using cloud services such as Deta and Docker container Understand the important building blocks of a web app such as form handling, templating and database interaction Who This Book Is For Aspiring and the experienced Python developers looking to leverage the flexibility of Python and the powerful features introduced in Modern Python. Computer science Engineering students at graduate and postgraduate level will also benefit immensely from the practical approach adapted in the book. Table of Contents About the Author About the Technical Reviewer Acknowledgments Introduction Chapter 1: Introduction to FastAPI Type Hints The typing Module Asynchronous Processing The asyncio Module ASGI About REST Architecture What Is an API? REST REST Constraints HTTP Verbs POST Method GET Method PUT Method DELETE Method FastAPI Dependencies Starlette Pydantic Uvicorn Installation of FastAPI Summary Chapter 2: Getting Started with FastAPI Hello World Create an Application Object Path Operation Decorator Path Operation Function Start Uvicorn Externally Visible Server Interactive API Docs Swagger UI Redoc JSON Schema Path Parameters Using Type Hints Type Parsing Query Parameters Optional Parameters Order of Parameters Validation of Parameters Validating String Parameter Validation with RegEx Validating Numeric Parameters Adding Metadata Summary Chapter 3: Request Body POST Method Body Parameters Data Model with Pydantic dataclasses Module BaseModel Pydantic Model As Parameter Model Configuration orm_mode Pydantic Fields Validation Custom Validation Nested Models Summary Chapter 4: Templates HTML Response Template Engine Hello World Template Template with Path Parameter Template Variables Passing dict in Template Context Conditional Blocks in Template Loop in Template Serving Static Assets Using JavaScript in Template Static Image CSS As a Static Asset HTML Form Template Retrieve Form Data Summary Chapter 5: Response Response Model Cookies set_cookie() Method Cookie Parameter Headers Header Parameter Response Status Code Response Types HTMLResponse JSONResponse StreamingResponse FileResponse RedirectResponse Summary Chapter 6: Using Databases DB-API Creating the Books Table Inserting a New Book Selecting All Books Selecting a Single Book Updating a Book Deleting a Book aiosqlite Module SQLAlchemy async in SQLAlchemy databases Module Core Expression Language Table Class Methods FastAPI Path Operations PyMongo for MongoDB Motor for MongoDB Summary Chapter 7: Bigger Applications Single File App APIRouter Router Package Mounting Subapplications Dependencies Example of Dependency Injection Query Parameters As Dependencies Parameterized Dependency Function Using Class As Dependency Database Session Dependency Dependency in Decorator Middleware CORS Summary Chapter 8: Advanced Features WebSockets How Do WebSockets Work? WebSocket Server WebSocket Client WebSockets Module in FastAPI Test WebSockets with Insomnia Multiclient Chat Application GraphQL The Schema Definition Language Queries Mutations Subscriptions Schema Strawberry GraphQL FastAPI Events Mounting WSGI Application Summary Chapter 9: Security and Testing Exception Handling User-Defined Exception Security Basic Access Authentication OAuth OAuth2PasswordBearer Testing Testing WebSocket Testing Databases Override Dependency Override get_db() AsyncClient Summary Chapter 10: Deployment Hypercorn HTTPS Daphne Gunicorn FastAPI on Render Cloud Docker Google Cloud Platform Deta Cloud Summary Index