Update s3.cc to add Content-MD5 header to V4 S3 api #1522
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Content-MD5 header is required for the PutObject in case Object Lock is activated as per:
https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html
I've only tested with Backblaze's S3 V4 compatible API, which throws this error while uploading to a Object Locked bucket :
xbcloud: S3 error message: Missing required header for this request: Content-MD5
So I'm not sure if Amazon S3 will throw the same error or not, but from their API docs, it seems to be required as well.
I've compiled the code to test the change with Backblaze and it's working as intended.