Signed Download URLs
Explore how to generate signed download URLs using AWS SDK to provide secure, temporary access to files stored in S3. Learn about the limitations of public links and temporary credentials, and how to implement controlled file downloads in serverless applications with AWS Lambda.
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Another URL is required
In the previous chapter, you used the same URL for both the form display function and the form processing function. This was possible because the browser web form workflow used two different HTTP methods. To display the form, it sent a GET request. To upload the submission details, it sent a POST request. Because S3 redirects work as GET method calls, you cannot use the same URL with different methods anymore. The browser will send a POST request directly to S3, which will redirect to another URL. You’ll need a different URL to handle that redirect, so you can create a new API endpoint.
When S3 sends a redirect after the upload, it will include information about the uploaded file in the query ...