- From: HTTP Working Group <ietf-http-wg@w3.org>
- Date: Sun, 22 Jul 2018 16:03:37 +0000
- To: HTTP Working Group <ietf-http-wg@w3.org>
- Cc: Kari Hurtta <hurtta-ietf@elmme-mailer.org>, Ilya Grigorik <ilya@igvita.com>
HTTP Client Hints https://tools.ietf.org/html/draft-ietf-httpbis-client-hints-06 3.1. The DPR Header Field https://tools.ietf.org/html/draft-ietf-httpbis-client-hints-06#section-3.1 | The "DPR" request header field is a number that indicates the | client's current Device Pixel Ratio (DPR), which is the ratio of | physical pixels over CSS px (Section 5.2 of [CSSVAL]) of the layout | viewport (Section 9.1.1 of [CSS2]) on the device. | | DPR = 1*DIGIT [ "." 1*DIGIT ] | | If DPR occurs in a message more than once, the last value overrides | all previous occurrences. But on elsewhere https://tools.ietf.org/html/rfc7230#section-3.2.2 | A recipient MAY combine multiple header fields with the same field | name into one "field-name: field-value" pair, without changing the | semantics of the message, by appending each subsequent field value to | the combined field value in order, separated by a comma. So is that saying that if there is several DPR values on DPR Header Field, last value is used ? If that in interpreted only that if last DPR header field is used, and header field is ignored if it does not fit DPR = 1*DIGIT [ "." 1*DIGIT ] syntax, result is different is recipient combines multiple DPR headers. 3.1.1. Confirming Selected DPR https://tools.ietf.org/html/draft-ietf-httpbis-client-hints-06#section-3.1.1 | If Content-DPR occurs in a message more than once, the last value | overrides all previous occurrences. ( Partially same on here. Refering of value is better however ). 3.1.1. Confirming Selected DPR https://tools.ietf.org/html/draft-ietf-httpbis-client-hints-06#section-3.1.1 | If Content-DPR occurs in a message more than once, the last value | overrides all previous occurrences. Same in here. 3.2. The Width Header Field https://tools.ietf.org/html/draft-ietf-httpbis-client-hints-06#section-3.2 | If Width occurs in a message more than once, the | last value overrides all previous occurrences. ( Partially same on here. Refering of value is better however ). 3.3. The Viewport-Width Header Field https://tools.ietf.org/html/draft-ietf-httpbis-client-hints-06#section-3.3 | If Viewport-Width occurs in a message more than once, the last value | overrides all previous occurrences. So it should mention that on these header fields also last value is used when values are ',' -separated. / Kari Hurtta
Received on Wednesday, 25 July 2018 16:12:45 UTC