def render_headers(self):
        """
        Renders the headers for this request field.
        """
        lines = []

        sort_keys = ["Content-Disposition", "Content-Type", "Content-Location"]
        for sort_key in sort_keys:
            if self.headers.get(sort_key, False):
                lines.append(u"%s: %s" % (sort_key, self.headers[sort_key]))

        for header_name, header_value in self.headers.items():
            if header_name not in sort_keys:
                if header_value:
                    lines.append(u"%s: %s" % (header_name, header_value))

        lines.append(u"\r\n")
        return u"\r\n".join(lines)

        Renders the headers for this request field.
        
product/gradle-plugin/src/main/python/pip/_vendor/urllib3/fields.py