File upload and download performance test based on the locust framework

In many business scenarios , You need to test for file upload and download . When you want to test a business , We must first understand the essence of this business . Let's first look at the essence of uploading and downloading .

File upload process

1、 Select the local file on the browser , Click upload

2、 The browser reads local files , Put the contents of the file into HTTP Requested body in , And then in HTTP Request header , Mark request data type :

Content-type:multipart/form-data,

With post Submit the form to the server .

3、 After the server receives the requested data , Create a new file on the server , take body Write the data in to a file , One time file upload processing is completed .

File download process

1、 Click the download button on the browser , Initiate a HTTP get Type request

2、 After the server receives the request , Read out the contents of the corresponding file , Write to HTTP Response , And mark in the response header Content- Disposition: attachment; filename=xxx

3、 When the browser receives the response , According to the mark, it is recognized that this is a download request , According to the filename Create a file with the same name locally , Then write the data in the response to the file , One download file processing is completed .

It can be seen from the description of uploading and downloading , The so-called file upload and download , In fact, they all attach the contents of the file to HTTP Transmission in the request .

Use Locust Upload and download test files

First, let's take a look at the interface documents uploaded and downloaded by a project

File upload script writing

Execute the script , Request in your local browser http://localhost:8089/, Enter concurrent users , and ip port , Click to start execution

Can be in Pycharm Print the return result of each upload on the console

File download script writing

Execute the script , stay locust UI Start testing on the interface , Can be in Pycharm See the return value of the interface

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matters needing attention

During file downloading , The server is only responsible for returning the file content to the client , The creation and saving of files should be done by the client . If you do the interface test of the server , There is no need to create files locally . The contents of the file are placed in the response body Medium , Just judge the response body The size of is the same as the file size , That means the download is successful .