Amazon Simple Storage Service (S3) is a scalable storage service provided by AWS (Amazon Web Services) that allows users to store and retrieve any amount of data at any time from anywhere on the web. In Amazon S3, different operations are associated with particular requests, including PUT, COPY, POST, and LIST. Understanding these requests is crucial for effectively managing and utilizing S3 buckets and objects.

PUT Request

The PUT request in Amazon S3 is used to add objects to a bucket. When you perform a PUT request, you're essentially uploading data to your S3 bucket.

Example

Here's a basic example using the AWS CLI to perform a PUT operation to upload a file:

• Headers: The PUT request can include headers that define metadata. For example, you can specify the content type or set up server-side encryption.
• Permissions: You need `s3:PutObject` permission granted to perform this operation.
• Cost: You are charged for each PUT request as per AWS pricing.
• Multipart Copy: Amazon S3 supports copying large objects using multipart operations.
• Permissions: The source bucket requires `s3:GetObject` permission, and the destination requires `s3:PutObject`.
• In-region vs Cross-region: In-region copies are typically faster and cheaper than cross-region ones due to reduced data transfer expenses.
• HTML Forms: Users often use POST requests with HTML forms for uploading files via web browsers.
• Signed URLs: To authorize and authenticate access to protected buckets, signed URLs can be used along with POST requests.
• Policy Document: A policy document is attached to a form to determine the conditions under which a request can succeed.
• Pagination: For buckets with many objects, results can be paginated.
• Permissions: `s3:ListBucket` permission is required.
• Prefix and Delimiter: You can use these to get objects starting with or grouped by common prefixes, respectively.