How to implement multiple routing paths in FastAPI

How to implement multiple routing paths in FastAPI

FastAPI is a modern, fast (faster than Flask) Python-based web framework with a concise and easy-to-use syntax that is widely used to build RESTful APIs and web applications. In FastAPI, multiple routing paths can be easily implemented to handle different requests, making our application more functional. This article will introduce how to implement multiple routing paths in FastAPI and provide corresponding code examples.

1. Quickly create a FastAPI application

First, we need to quickly create a FastAPI application to subsequently demonstrate the implementation of multiple routing paths. Before that, we need to install FastAPI and uvicorn (used to start the FastAPI application):

pip install fastapi uvicorn

Then, create a FastAPI application in the Python file:

from fastapi import FastAPI app = FastAPI() @app.get("/") def hello_world(): return {"message": "Hello, World!"}

Next, use the command line to run the following command to start the FastAPI application:

uvicorn main:app --reload

Now, our FastAPI application is accessible, And there is only one routing path, the root path (/).

2. Implement multiple routing paths

To implement multiple routing paths, we can use the decorators provided by FastAPI to create different path processing functions. Here is an example that demonstrates how to implement multiple routing paths:

from fastapi import FastAPI app = FastAPI() @app.get("/") def hello_world(): return {"message": "Hello, World!"} @app.get("/users") def get_users(): return {"message": "Get all users"} @app.get("/users/{user_id}") def get_user(user_id: int): return {"message": f"Get user {user_id}"}

In the above example, we have added two new routing paths: /users and /users/{user_id}.

• /users path is used to obtain information about all users.
• /users/{user_id} The path is used to obtain information about a specific user based on the user ID.

In these two routing paths, we define corresponding processing functions to handle their requests. As you can see, we used the decorator @app.get() in the processing function and specified the corresponding path. In this way, when the request reaches these paths, FastAPI will automatically call the corresponding processing function for processing.

3. Test multiple routing paths

Now, our application has three routing paths: /, /users and /users/{user_id}. We can test the functionality of these routing paths by sending HTTP requests. Here are some examples:

• GET / : Returns {"message": "Hello, World!"}
• GET /users : Returns {"message": "Get all users "}
• GET /users/1: Returns {"message": "Get user 1"}

We can use tools such as Postman or curl to test these routing paths to Get the corresponding response results.

Summary

It is very simple to implement multiple routing paths in FastAPI. Simply use decorators such as @app.get() to define different path processing functions to implement request processing for different paths. The above example shows how to quickly create a FastAPI application and implement multiple routing paths. Through these routing paths, we can add various functions to our applications and implement more complex business logic. I hope this article will help you understand the multi-routing path function of FastAPI.

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