If the extension field is anything like IP or TCP options, some middleboxes will also tamper the hell out of that field and strip unknown extensions, or just br

If the extension field is anything like IP or TCP options, some middleboxes will also tamper the hell out of that field and strip unknown extensions, or just break connections. Often-referenced paper in that field: http://conferences.sigcomm.org/imc/2011/docs/p181.pdf http://conferences.sigcomm.org/imc/2011/docs/p181.pdf