Here we use the Koa to implement our server.įinally, I hope you will have a brief understanding of formdata, we use this data format to upload files. When we discuss uploading files in the front-end, if we want to fully understand the relevant principles, we must understand the relevant back-end code. In actual development, we generally don’t use XMLHttpRequest directly, and using Axios conforms to the real development model. The following example shows you how to create an HTML form to upload an object, using a signature that's created with the V4 policy signing process. Prerequisitesīefore the start coding, we still need to understand some background knowledge.įirst, when uploading files, we use Axios, the most popular HTTP Library. Divide a large file into blocks then uploadingĪnd additionally, sometimes we may not upload files in the client browser, but through the server to upload to another server. Select a file to upload In a form, the file value of the type attribute allows you to define an input element for file uploads.Our Goalsįirst, let’s clarify the specific functions of file uploading.Īccording to upload target, there are 3 kind tasks:Īccording to the user actions, there are:įrom a performance perspective, we may need: In this article, I have summarized some scenarios and solutions, hoping to help you thoroughly grasp questions related to file uploading. I believe that everyone has encountered related requirements more or less during the development. File upload is a common function for a web project.
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