How to use the Vary HTTP header and why you need it
What is the HTTP Vary header used for?
Often, HTTP Vary is used to detect compressed and uncompressed data when dynamically displaying pages. In this case, accept-encoding is used. If the user's browser is not able to process Gzip-compressed content, information is sent in an uncompressed form. This is necessary to improve the appearance of the pages and the content contained on them.
User-agent helps not only to distinguish content versions but also to quickly recognize information by search bots. So Vary header can be partially considered an SEO optimization tool, but you should not specifically configure it for bot recognition.
The most common problems with Vary HTTP
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