Access Control Header

[keshavakarthik]

How to give the public access to file uploads to s3 ?
I tried adding
headers = curl_slist_append(headers, "x-amz-ac: public-read") in
private static func prepare(_ access: Access, method: String, bucket: String, region: String, file: String, contentType: String) throws -> (CURL, UnsafeMutablePointer<curl_slist>).

But with above changes file uploads are failing. Please help