protected List<HeaderValue> parseHeaderValue(String headerValue) {
        return parseHeaderValue(headerValue, HEADER_VALUE_SEPARATOR, HEADER_QUALIFIER_SEPARATOR);
    }
@Test
    void headers_parseHeaderValue_complexAccept() {
        AwsProxyHttpServletRequest request = new AwsProxyHttpServletRequest(complexAcceptHeader, mockContext, null, config);
        List<AwsHttpServletRequest.HeaderValue> values = request.parseHeaderValue(request.getHeader(HttpHeaders.ACCEPT), ",", ";");

        assertEquals(4, values.size());
    }