Odoo (v11 that I use) does not support RFC 2369.

My question: How can I add unsubscribe link with both the email and the http links?

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RFC 2369 is clear about what Odoo Email Marketing Unsubscribe mass-mail should support: 

The List-Unsubscribe header formatting is:

List-Unsubscribe: <mailto:unsubscribe-espc-tech-12345N@domain.com>,
<http://domain.com/member/unsubscribe/?listname=espc-tech@domain.com?id=12345N>

Please note that the unsubscribe link (http:// link ) should not require further input from the user and the request should be processed after receiving a POST request. It should be one-click unsubscribe as described in RFC 8058 below :

List-Unsubscribe: <https://example.com/unsubscribe/opaquepart>
List-Unsubscribe-Post: List-Unsubscribe=One-Click

Resulting POST request
POST /unsubscribe/opaquepart HTTP/1.1
Host: example.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 26

List-Unsubscribe=One-Click.

Also, the local part of mailto:link address should not exceed more than 64 characters.