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    I suggest to remove this constraint from the spec.<br>
    <br>
    <div class="moz-cite-prefix">Am 25.08.2016 um 16:30 schrieb Thomas
      Broyer:<br>
    </div>
    <blockquote
cite="mid:CAEayHENDSJHyEhspsC1dCH_2HVE1PvCWA8dXxOAn_Mn=vSxbkw@mail.gmail.com"
      type="cite">
      <div dir="ltr">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).
        <div><br>
        </div>
        <div>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".</div>
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      <br>
      <div class="gmail_quote">
        <div dir="ltr">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:<br>
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          .8ex;border-left:1px #ccc solid;padding-left:1ex">
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            lang="EN-US">
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              <p class="MsoNormal"><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></p>
              <p class="MsoNormal"><span style="color:#002060"> </span></p>
              <p class="MsoNormal"><span style="color:#002060">                                                      
                  -- Mike</span></p>
              <p class="MsoNormal"><a moz-do-not-send="true"
                  name="m_8880273005057838509__MailEndCompose"><span
                    style="color:#002060"> </span></a></p>
              <span></span>
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                  <p class="MsoNormal"><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"
                        target="_blank"><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></p>
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          <div bgcolor="white" link="#0563C1" vlink="#954F72"
            lang="EN-US">
            <div>
              <p class="MsoNormal"> </p>
              <p class="MsoNormal" style="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.<span style="font-size:12.0pt"></span></p>
              <div>
                <p class="MsoNormal">Am 24.08.2016 um 03:44 schrieb Mike
                  Jones via Openid-specs-ab:</p>
              </div>
              <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
                <p class="MsoNormal">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.</p>
                <p class="MsoNormal"> </p>
                <p class="MsoNormal">The new specification versions are:</p>
                <p><span style="font-family:Symbol"><span>·<span
                        style="font:7.0pt "Times New Roman"">      
                      </span></span></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></p>
                <p><span style="font-family:Symbol"><span>·<span
                        style="font:7.0pt "Times New Roman"">      
                      </span></span></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></p>
                <p class="MsoNormal"> </p>
                <p class="MsoNormal">                                                      
                  -- Mike</p>
                <p class="MsoNormal"> </p>
                <p class="MsoNormal">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>.</p>
                <p class="MsoNormal"><span
                    style="font-size:12.0pt;font-family:"Times New
                    Roman",serif"><br>
                    <br>
                    <br>
                  </span></p>
                <pre>_______________________________________________</pre>
                <pre>Openid-specs-ab mailing list</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></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></pre>
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              <p class="MsoNormal"><span
                  style="font-size:12.0pt;font-family:"Times New
                  Roman",serif"> </span></p>
            </div>
          </div>
          _______________________________________________<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"
            rel="noreferrer" target="_blank">http://lists.openid.net/mailman/listinfo/openid-specs-ab</a><br>
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