final URI uri = root.resolve(key.getHashCode());
        HttpPut httpPut = new HttpPut(uri);
        if (useExpectContinue) {
            httpPut.setHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
        }
        httpPut.addHeader(HttpHeaders.CONTENT_TYPE, BUILD_CACHE_CONTENT_TYPE);
        requestCustomizer.customize(httpPut);