This topic describes how to use form upload on the web to directly upload data to OSS.

Each OSS user needs to upload data to OSS. When you use the web to upload an object, you can use the browser or app to upload the object to an application server. The application server uploads the object to OSS. During this process, the application server is necessary to transfer the object, which delivers lower transmission efficiency than direct data upload.

Direct upload allows you to call the PostObject operation provided by OSS to upload data. For more information about the PostObject operation, see PostObject. The following cases describe how to directly upload data to OSS by using form upload: