I saw the first dump of the headers and I thought back to the article someone linked in HN comments(https://www.fastly.com/blog/best-practices-for-using-the-var

I saw the first dump of the headers and I thought back to the article someone linked in HN comments(https://www.fastly.com/blog/best-practices-for-using-the-vary-header https://www.fastly.com/blog/best-practices-for-using-the-var...), and I was on the right path.