How to set Http Header for Amazon S3 programmatically?

Question

I want to set expiration date header for files which are stored in S3 by my asp.net web application.

• first case - during PutObject requests
• second case - update of expiration date once a month to update expiration dates.

Answer 1

As you are using Asp.net, I assume you are using the AWS .NET SDK.

To add the Expires(or any other http header) when uploading the object, add it as part of the PutObject request.

var client = new Amazon.S3.AmazonS3Client(AWS_Key, AWS_SecretKey);

var req = new Amazon.S3.Model.PutObjectRequest()
                 .WithFilePath(@"C:\myfile.txt")
                 .WithKey("myfile.txt")
                 .WithBucketName("mybucket");

req.AddHeader("expires", "Thu, 01 Dec 1994 16:00:00 GMT");

client.PutObject(req);

To change the header on an existing object, you need to copy the object to itself.

var req = new Amazon.S3.Model.CopyObjectRequest()
                 .WithDirective(Amazon.S3.Model.S3MetadataDirective.REPLACE)
                 .WithSourceBucket("mybucket")
                 .WithSourceKey("myfile.txt")
                 .WithDestinationBucket("mybucket")
                 .WithDestinationKey("myfile.txt");

req.AddHeader("expires", "Thu, 01 Dec 1994 16:00:00 GMT");

client.CopyObject(req);

Note: .WithDirective(Amazon.S3.Model.S3MetadataDirective.REPLACE) must be set in order to specify new headers. Otherwise the existing headers are just copied over.

More more info see the .NET SDK docs.