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    Hi all,<br>
    <br>
    any development regarding this topic? I still consider this
    requirement is not needed.<br>
    <br>
    best regards,<br>
    Torsten.<br>
    <br>
    <div class="moz-cite-prefix">Am 27.08.2016 um 02:06 schrieb Mike
      Jones:<br>
    </div>
    <blockquote
cite="mid:DM2PR0301MB0637A3F9313E00167BABCFB1F5EC0@DM2PR0301MB0637.namprd03.prod.outlook.com"
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">I’m
            sympathetic to removing it but I’d like to first understand,
            if possible, why we included the constraint in the first
            place.  (Thomas may be right that it was copied from the
            front-channel logout spec, but there may still have been
            reasons for doing so.)  John?  Anyone else?<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">                                                      
            -- Mike<o:p></o:p></span></p>
        <p class="MsoNormal"><a moz-do-not-send="true"
            name="_MailEndCompose"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"><o:p> </o:p></span></a></p>
        <span style="mso-bookmark:_MailEndCompose"></span>
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            <p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">
                Torsten Lodderstedt [<a class="moz-txt-link-freetext" href="mailto:torsten@lodderstedt.net">mailto:torsten@lodderstedt.net</a>]
                <br>
                <b>Sent:</b> Friday, August 26, 2016 2:58 AM<br>
                <b>To:</b> Thomas Broyer <a class="moz-txt-link-rfc2396E" href="mailto:t.broyer@ltgt.net"><t.broyer@ltgt.net></a>; Mike
                Jones <a class="moz-txt-link-rfc2396E" href="mailto:Michael.Jones@microsoft.com"><Michael.Jones@microsoft.com></a>;
                <a class="moz-txt-link-abbreviated" href="mailto:openid-specs-ab@lists.openid.net">openid-specs-ab@lists.openid.net</a><br>
                <b>Subject:</b> Re: [Openid-specs-ab] Session ID
                semantics aligned across OpenID Connect front-channel
                and back-channel logout specs<o:p></o:p></span></p>
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        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal" style="margin-bottom:12.0pt">I suggest to
          remove this constraint from the spec.<o:p></o:p></p>
        <div>
          <p class="MsoNormal">Am 25.08.2016 um 16:30 schrieb Thomas
            Broyer:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoNormal">May I suggest a copy-pasta from the
              frontchannel spec? (where it makes sense to follow the Web
              Origin restrictions, in case the frontchannel_logout_uri
              uses localStorage/sessionStorage or similar; and it's
              stricter than "cookie domains" so it works for cookies
              too). <o:p></o:p></p>
            <div>
              <p class="MsoNormal"><o:p> </o:p></p>
            </div>
            <div>
              <p class="MsoNormal">BTW, that makes for a good reminder
                of why a spec should explain the "why" of its
                constraints, and not just "do this", "don't do that".<o:p></o:p></p>
            </div>
          </div>
          <p class="MsoNormal"><o:p> </o:p></p>
          <div>
            <div>
              <p class="MsoNormal">On Thu, Aug 25, 2016 at 3:43 PM Mike
                Jones via Openid-specs-ab <<a moz-do-not-send="true"
                  href="mailto:openid-specs-ab@lists.openid.net">openid-specs-ab@lists.openid.net</a>>
                wrote:<o:p></o:p></p>
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                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
                      style="color:#002060">John, do you remember the
                      rationale for the URL restrictions?  I know that
                      we talked about this as the spec was being written
                      ~1.5 years ago but I don’t remember the reasons
                      off the top of my head.</span><o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
                      style="color:#002060"> </span><o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
                      style="color:#002060">                                                      
                      -- Mike</span><o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a
                      moz-do-not-send="true"
                      name="m_8880273005057838509__MailEndCompose"><span
                        style="color:#002060"> </span></a><o:p></o:p></p>
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                      1.0pt;padding:3.0pt 0in 0in 0in">
                      <p class="MsoNormal"
                        style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
                            style="color:windowtext">From:</span></b><span
                          style="color:windowtext"> Torsten Lodderstedt
                          [mailto:<a moz-do-not-send="true"
                            href="mailto:torsten@lodderstedt.net"
                            target="_blank">torsten@lodderstedt.net</a>]
                          <br>
                          <b>Sent:</b> Thursday, August 25, 2016 4:56 AM<br>
                          <b>To:</b> Mike Jones <<a
                            moz-do-not-send="true"
                            href="mailto:Michael.Jones@microsoft.com"><a class="moz-txt-link-abbreviated" href="mailto:Michael.Jones@microsoft.com">Michael.Jones@microsoft.com</a></a>>;
                          <a moz-do-not-send="true"
                            href="mailto:openid-specs-ab@lists.openid.net"
                            target="_blank">openid-specs-ab@lists.openid.net</a><br>
                          <b>Subject:</b> Re: [Openid-specs-ab] Session
                          ID semantics aligned across OpenID Connect
                          front-channel and back-channel logout specs</span><o:p></o:p></p>
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              <div>
                <div>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Hi
                    Mike,<br>
                    <br>
                    section 2.2 states "The domain, port, and scheme of
                    this URL MUST be the same as that of a registered
                    Redirection URI value."<br>
                    <br>
                    What's the rational for limiting the logout URL that
                    way?<br>
                    <br>
                    best regards,<br>
                    Torsten.<o:p></o:p></p>
                  <div>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Am
                      24.08.2016 um 03:44 schrieb Mike Jones via
                      Openid-specs-ab:<o:p></o:p></p>
                  </div>
                  <blockquote
                    style="margin-top:5.0pt;margin-bottom:5.0pt">
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Session
                      ID definitions in the OpenID Connect front-channel
                      and back-channel logout specs have been aligned so
                      that the Session ID definition is now the same in
                      both specs.  The Session ID is scoped to the
                      Issuer in both specs now (whereas it was
                      previously global in scope in the front-channel
                      spec).  This means that the issuer value now needs
                      to be supplied whenever the Session ID is.  This
                      doesn’t change the simple (no-parameter)
                      front-channel logout messages.  The back-channel
                      specification is now also aligned with the ID
                      Event Token specification.<o:p></o:p></p>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The
                      new specification versions are:<o:p></o:p></p>
                    <p><span style="font-family:Symbol">·</span><span
                        style="font-size:7.0pt">       </span>
                      <a moz-do-not-send="true"
                        href="http://openid.net/specs/openid-connect-frontchannel-1_0-01.html"
                        target="_blank">http://openid.net/specs/openid-connect-frontchannel-1_0-01.html</a><o:p></o:p></p>
                    <p><span style="font-family:Symbol">·</span><span
                        style="font-size:7.0pt">       </span>
                      <a moz-do-not-send="true"
                        href="http://openid.net/specs/openid-connect-backchannel-1_0-03.html"
                        target="_blank">http://openid.net/specs/openid-connect-backchannel-1_0-03.html</a><o:p></o:p></p>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">                                                      
                      -- Mike<o:p></o:p></p>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">P.S. 
                      This notice was also posted at
                      <a moz-do-not-send="true"
                        href="http://self-issued.info/?p=1599"
                        target="_blank">http://self-issued.info/?p=1599</a>
                      and as
                      <a moz-do-not-send="true"
                        href="https://twitter.com/selfissued"
                        target="_blank">@selfissued</a>.<o:p></o:p></p>
                    <p class="MsoNormal"
                      style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><span
                        style="font-family:"Times New Roman
                        ,serif",serif"><br>
                        <br>
                      </span><o:p></o:p></p>
                    <pre>_______________________________________________<o:p></o:p></pre>
                    <pre>Openid-specs-ab mailing list<o:p></o:p></pre>
                    <pre><a moz-do-not-send="true" href="mailto:Openid-specs-ab@lists.openid.net" target="_blank">Openid-specs-ab@lists.openid.net</a><o:p></o:p></pre>
                    <pre><a moz-do-not-send="true" href="http://lists.openid.net/mailman/listinfo/openid-specs-ab" target="_blank">http://lists.openid.net/mailman/listinfo/openid-specs-ab</a><o:p></o:p></pre>
                  </blockquote>
                  <p class="MsoNormal"
                    style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
                      style="font-family:"Times New Roman
                      ,serif",serif"> </span><o:p></o:p></p>
                </div>
              </div>
              <p class="MsoNormal">_______________________________________________<br>
                Openid-specs-ab mailing list<br>
                <a moz-do-not-send="true"
                  href="mailto:Openid-specs-ab@lists.openid.net"
                  target="_blank">Openid-specs-ab@lists.openid.net</a><br>
                <a moz-do-not-send="true"
                  href="http://lists.openid.net/mailman/listinfo/openid-specs-ab"
                  target="_blank">http://lists.openid.net/mailman/listinfo/openid-specs-ab</a><o:p></o:p></p>
            </blockquote>
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        </blockquote>
        <p class="MsoNormal"><o:p> </o:p></p>
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