Re: CORS performance

On Thu, Feb 19, 2015 at 11:43 AM, Brian Smith <brian@briansmith.org> wrote:
> 1. Preflight is only necessary for a subset of CORS requests.
> Preflight is never done for GET or HEAD, and you can avoid preflight
> for POST requests by making your API accept data in a format that
> matches what HTML forms post. Therefore, we're only talking about PUT,
> DELETE, less common forms of POST, and other less commonly-used
> methods.

Euh, if you completely ignore headers, sure. But most HTTP APIs will
use some amount of custom headers, meaning *all* methods require a
preflight.


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