content_type = Tesla.get_header(head_response, "content-type")
content_length = Tesla.get_header(head_response, "content-length")
content_length = content_length && String.to_integer(content_length)
content_type = Tesla.get_header(head_response, "content-type")
content_length = Tesla.get_header(head_response, "content-length")
content_length = content_length && String.to_integer(content_length)