Re: [whatwg/xhr] Web compat implications of making getAllResponseHeaders lowercase (#146) from Mark Nottingham on 2017-08-04 (public-webapps-github@w3.org from August 2017)

From: Mark Nottingham <notifications@github.com>
Date: Thu, 03 Aug 2017 23:42:51 -0700
To: whatwg/xhr <xhr@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <whatwg/xhr/issues/146/320170398@github.com>

It is not a protocol contract, never has been; [field-names are case-insensitive](https://tools.ietf.org/html/rfc1945#section-4.2).

If you upgrade your servers to HTTP/2, or use a CDN that implements it for you, your application will break.

If one of your users configure a HTTP/2 proxy -- for example, the [Chrome Data Saver proxy](https://developer.chrome.com/multidevice/data-compression) -- your application will break. [Try it](http://test.mnot.net/headercase.html).

If one of your users installs a virus scanning proxy, extension, etc., your application might break (because they're allowed to do this too).

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Received on Friday, 4 August 2017 06:43:14 UTC