Are there AWS S3 constants defined in AWS SDK?

Question

There are a lot constant string in AWS such as header keys. Are those constants defined somewhere in the SDK where I can find an use them. 
For example. When using the TransferUtility if I want to add a sha256 checksum value I need to set the header values like this:
```
var request = new TransferUtilityUploadRequest();
request.Metadata.Add("x-amz-meta-nrcs-checksumsha256", checksumSha256);
```
It would be nice if there was a constant defined in SDK so I don't have to use magic strings.

Adeleke Adebowale .J. · Answer

Yes, AWS SDKs often provide constants for commonly used values, including header keys, to help avoid the use of "magic strings" in your code. These constants can improve code readability and maintainability.
For example, in the AWS SDK for .NET, certain constant values are defined in static classes. However, not all header values might be predefined as constants, especially if they are custom or less commonly used headers.
While the AWS SDK for .NET does include some constants, not all possible header values may be predefined. You should check the SDK documentation and source code for available constants https://docs.aws.amazon.com/search/doc-search.html?searchPath=documentation&searchQuery=SDK . For headers not provided by the SDK, defining your own constants in a static class is a good practice to avoid magic strings and improve code maintainability.

This might be useful too :- https://github.com/aws/aws-sdk-net
https://github.com/aws/aws-sdk-net/blob/master/sdk/src/Services/S3/Custom/Util/S3Constants.cs

Are there AWS S3 constants defined in AWS SDK?

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