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Please be reminded that we created the aiohttp_session object only once during the startup event. You need to wrap it inside the context manager for it to work properly. Next, letвЂ™s define another route operation, but this time we will use the aiohttp session object instead. async def requests_api(): r = (' return r.json() The result will be returned directly as JSON. async def startup_event(): app.requests_session = requests.Session() app.aiohttp_session = aiohttp.ClientSession() async def shutdown_event(): await app.aiohttp_session.close() Route operationsДefine the following route operation which makes an HTTP GET call to our external API when requested. The shutdown event is responsible for calling the built-in close function to close the aiohttp client session as part of the cleanup process.

Certain parameters will be persisted across each request. This can result in a significant boost to performance when making requests to the same host. We are going to use session objects instead to reuse the underlying TCP connection. The startup event is responsible for initializing session objects for both Requests and aiohttp. from fastapi import FastAPI import requests import aiohttp app = FastAPI() Startup and shutdown eventsД¬ontinue by adding the following startup and shutdown events.

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wget -q -O - | sudo apt-key add - Red Hat/CentOSДЇor CentOS users, you can easily install it as follows: wget -O bintray-loadimpact-rpm.reposudo mv bintray-loadimpact-rpm.repo /etc//sudo yum install k6ДЇastAPI Server for Testing aiohttp and Requests ImportД¬reate a new Python file called myapp.py and add the following import statement at the top of the file. In this case, use the following commands instead. There might arise an issue in which the key is not obtainable due to firewalls or proxies. sudo apt-key adv -keyserver hkp://:80 -recv-keys 379CE192D401AB61echo 'deb stable main' | sudo tee -a /etc/apt/sources.listsudo apt-get updatesudo apt-get install k6 brew install k6 Debian/UbuntuДЄpt-get can be used to install k6 in your Debian or Ubuntu operating system. Then install it normally by running it.Д«rew is the preferred choice when it comes to installation in Mac.

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Head over to the link below and download the installer. Windows users should use the available MSI installer. Installation for k6 is dependent on the operating system of your machine. LetвЂ™s proceed to the next section and start installing the necessary modules. Introduction To Locust: An Open-Source Load Testing Tool in Python.

An Introduction to k6: An API Load Testing Tool.

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Feel free to use your own load testing tools, for example: I will be using the k6 package for load testing.

Create a load testing script on the second server to evaluate the requests per second.

Implement another FastAPI server with two GET route operations which will call the external API using both Requests and aiohttp modules.

Implement a simple FastAPI server with a GET route operation acting as the external API for fetching data.

However, the syntax is a lot more verbose compared to Requests, which makes it difficult to be implemented by new developers. Calling APIs asynchronous provides an edge in terms of performance especially when I/O operations make up the majority of the processes in your project. In addition, most of the servers are now built using ASGI servers. It was designed to make the most out of network operations in a non-blocking way.

On the other hand, aiohttp, is an asynchronous HTTP framework for both client and server.

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Besides, it provides great support for HTTP 1.1 and full automation of HTTP connection pooling. It is a fairly simple and straightforward HTTP library for Python. The first is Requests: HTTP for Humans, which is one of the most common packages used by developers. This tutorial focuses on the comparison between two main packages for calling API requests in Python.

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