When I respond to HTTP request with `Range: 0-1023`, should I include `Vary: Range` in response?

Question

When the HTTP request contains header Range and the server responds 206 Partial Content, should the response always include Vary: Range? I think because the output will be obviously different for any different Range but I cannot find any official requirement for this.

The Vary seems reduntant here because any user agent supporting partial content should implicitly understand this.

Julian Reschke · Accepted Answer · 2020-12-11T17:09:13.593

1

No "Vary" response field is needed here. HTTP Range Requests are not a form of content negotiation as specified.

edited Dec 11 '20 at 17:09

answered Dec 11 '20 at 14:30

Julian Reschke

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Can you point to an RFC that defines this? – Mikko Rantalainen Dec 11 '20 at 14:30
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I don't believe it's explicitly stated. You may want to have a look at and potentially open a ticket on Github to get this clarified in the next set of specs. – Julian Reschke Dec 11 '20 at 15:12

When I respond to HTTP request with `Range: 0-1023`, should I include `Vary: Range` in response?

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