HTTP: Pragma header as per RFC2616 can be comma separated

[orospakr]

The "Pragma" header is defined as:

Pragma = "Pragma" ":" 1#pragma-directive

Which means that it is subject to the comma separation join rules.

Please add case 'pragma': to the "comma separate" case/switch statement in http.js, around line 263.

[ry]

Pragma HTTP header comma separation

Closed by 5287703, GH-716.