<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=utf-8">
<meta name=Generator content="Microsoft Word 11 (filtered medium)">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Arial Unicode MS";
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"\@Arial Unicode MS";
panose-1:2 11 6 4 2 2 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin-top:0cm;
margin-right:0cm;
margin-bottom:6.0pt;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman";
color:black;}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
pre
{margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Arial Unicode MS";
color:windowtext;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Arial Unicode MS";
color:blue;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
@page Section1
{size:595.3pt 841.9pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body bgcolor=white lang=EN-AU link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Unicode MS";
color:blue'>The User-Agent field does not have the right semantics. I hope that
field could be used, for instance, to notice which Relying Parties are using a
particular version of Janrain’s Java library for OpenID. It is probably
reasonable for Bloglines, Google etc to identify themselves in the User-Agent
field as they probably use proprietary purpose-built clients. Most OpenID RPs
will not use proprietary clients.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Unicode MS";
color:blue'>The From field feels more appropriate for this OpenID purpose.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Unicode MS";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Unicode MS";
color:blue'><o:p> </o:p></span></p>
<div>
<div class=MsoNormal align=center style='margin-bottom:0cm;margin-bottom:.0001pt;
text-align:center'><span lang=EN-US style='color:windowtext'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></div>
<p class=MsoNormal style='margin-bottom:0cm;margin-bottom:.0001pt'><b><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma;color:windowtext'>From:</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma;color:windowtext'> John
Panzer [mailto:jpanzer@acm.org] <br>
<b>Sent:</b> Wednesday, 17 October 2007 2:36 PM<br>
<b>To:</b> Manger, James H<br>
<b>Cc:</b> specs@openid.net<br>
<b>Subject:</b> Re: [OpenID] identify RP when it gets OpenID URL</span><span
lang=EN-US style='color:windowtext'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Wouldn't User-Agent: be equivalent, and have prior art (feed
readers such as Bloglines identify themselves via User-Agent)?<br>
<br>
Manger, James H wrote: <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Unicode MS";
color:blue'><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"></u1:SmartTagType></u1:SmartTagType>…</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Unicode MS"'> “The
Relying Party MUST include a From HTTP header field in each HTTP request made
during discovery. The From field holds an email address for the RP (eg From: <a
href="mailto:openid@example.net">openid@example.net</a>) [RFC2616]. This
enables the discovered information to vary based on the RP. The From field is
not authenticated so it is not appropriate to use for access control.”<u1:p></u1:p></span><o:p></o:p></p>
<pre><span style='font-family:"Arial Unicode MS"'><u1:p> </u1:p></span><span
style='font-family:"Arial Unicode MS";color:blue'>…</span><o:p></o:p></pre>
<p class=MsoNormal style='margin-bottom:0cm;margin-bottom:.0001pt'><o:p> </o:p></p>
</div>
</body>
</html>