pub const S3_ALGO_KEY: &str = "X-Amz-Algorithm";
pub const S3_CRED_KEY: &str = "X-Amz-Credential";
pub const S3_DATE_KEY: &str = "X-Amz-Date";
pub const S3_SIGNATURE_KEY: &str = "X-Amz-Signature";
pub const S3_EXPIRES_KEY: &str = "X-Amz-Expires";
pub const S3_SIGNED_HEADERS_KEY: &str = "X-Amz-SignedHeaders";
pub const S3_CONTENT_KEY: &str = "X-Amz-Content-Sha256";
pub const S3_ALGO_VALUE: &str = "AWS4-HMAC-SHA256";