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    How about language that says the sector identifier would be pulled
    down at registration and heavily cached.<br>
    <br>
     -- Justin<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 10/29/2013 08:59 PM, Mike Jones
      wrote:<br>
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        <p class="MsoNormal">In his review of Registration, George wrote
          the following about
          <a moz-do-not-send="true"
href="http://openid.net/specs/openid-connect-registration-1_0-20.html#SectorIdentifierValidation">http://openid.net/specs/openid-connect-registration-1_0-20.html#SectorIdentifierValidation</a>:<o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-left:.5in;text-autospace:none"><span
            style="font-family:"Helvetica","sans-serif"">It
            seems like there is some pretty complicated OP logic
            required to process the sector_identifier_uri.<o:p></o:p></span></p>
        <p class="MsoNormal"
          style="margin-left:.5in;text-autospace:none"><span
            style="font-family:"Helvetica","sans-serif"">Given
            that the the list of allowed redirect_uris in the JSON file
            can change at any time! the OP would<o:p></o:p></span></p>
        <p class="MsoNormal"
          style="margin-left:.5in;text-autospace:none"><span
            style="font-family:"Helvetica","sans-serif"">need
            to pull the file and verify that the current client
            redirect_uri is still present in the list. That is too much<o:p></o:p></span></p>
        <p class="MsoNormal"
          style="margin-left:.5in;text-autospace:none"><span
            style="font-family:"Helvetica","sans-serif"">over
            head to do at token issuance. Should we have some guidance
            that redirect_uris can be added to the<o:p></o:p></span></p>
        <p class="MsoNormal"
          style="margin-left:.5in;text-autospace:none"><span
            style="font-family:"Helvetica","sans-serif"">sector_identifier_uri
            file but SHOULD NOT be removed. Removing a redirect_uri from
            the file results in<o:p></o:p></span></p>
        <p class="MsoNormal"
          style="margin-left:.5in;text-autospace:none"><span
            style="font-family:"Helvetica","sans-serif"">undefined
            behavior? With this guidance the OP can do all the necessary
            checking at client registration<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-family:"Helvetica","sans-serif"">time
            which seems reasonable.</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">It’s always been my assumption that the
          sector_identifier_uri is validated once at registration time
          and never fetched again.  If people agree, I think we should
          say that.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">                                                               
          -- Mike<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
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