```json
{
    "title": "The VARY Header: Appropriate Compression and Caching",
    "url": "https://performancezen.com/2005/01/22/the-vary-header-appropriate-compression-and-caching/",
    "datePublished": "2005-01-22",
    "dateModified": "2005-01-22",
    "language": "en-US",
    "description": "The team at Port80 has a great article on why the VARY server respose header is important for caching and compression in HTTP/1.1 [here]. It succintly sums up this method…",
    "author": "spierzchala",
    "publisher": "Performance Zen"
}
```

# The VARY Header: Appropriate Compression and Caching

The team at [Port80](http://www.port80software.com/) has a great article on why the VARY server respose header is important for caching and compression in HTTP/1.1 [[here](http://www.port80software.com/200ok/archive/2005/01/21/272.aspx)]. It succintly sums up this method for determining what should be cached and which cached content should be delivered to requesting clients.