Authorization with Spaces using Go

Hello, I’m need a little help with getting all the headers setup so I can get to using Spaces.

I’m doing all of this in Go and I have a few questions.

What would I set the SignedHeaders to, I see in the api docs it has it set to host;x-amz-acl;x-amz-content-sha256;x-amz-date but I’m not familiar and now sure if that changes depending on what you’re doing or not.

My next question has to do with the Signature, again not 100% on the terminology used and would like a little help getting that going. So if anyone could help me out, that would be great.

Here is the code I currently have:

func SetAuthHeaders(accessKey, yymmdd, region string, req *http.Request) {

	credentials := fmt.Sprintf("%v/%v/%v/s3/aws4_request", accessKey, yymmdd, region)
	signedHeaders := "host;x-amz-acl;x-amz-content-sha256;x-amz-date"
	signature := fmt.Sprintf("")

	req.Header.Add("Authorization", "AWS4-HMAC-SHA256")
	req.Header.Add("Credential", credentials)
	req.Header.Add("SignedHeaders", signedHeaders)
	req.Header.Add("Signature", signature)
}

Thanks