OPTIONS Allow header differs deterministically between OSes

[tmornini]

When setting HandleMethodNotAllowed to true

MacOS 10.13.6

HTTP/1.1 405 Method Not Allowed
Allow: GET, HEAD, OPTIONS
Content-Length: 19
Content-Type: text/plain; charset=utf-8
Date: ⧆⧆:date⧆
X-Content-Type-Options: nosniff
 
Method Not Allowed

Ubuntu 16.04

HTTP/1.1 405 Method Not Allowed
Allow: HEAD, GET, OPTIONS
Content-Length: 19
Content-Type: text/plain; charset=utf-8
Date: ⧆⧆:date⧆
X-Content-Type-Options: nosniff
 
Method Not Allowed

This is causing us pain in testing using http-spec -- though we're aware that the headers are semantically equivalent.

[dolmen]

Is this about the order of the allowed methods in the Allow header?

[tmornini]

@dolmen Yes. Sorry for being less than 100% clear.