if get_req_header(conn, "signature") do
conn = conn
|> put_req_header("(request-target)", String.downcase("#{conn.method} #{conn.request_path}"))
assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
else
if get_req_header(conn, "signature") do
conn = conn
|> put_req_header("(request-target)", String.downcase("#{conn.method} #{conn.request_path}"))
assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
else