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[] (0) Define a way to expose HTTP login forms to spiders in 401 (or …
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…even 200) responses.

git-svn-id: http://svn.whatwg.org/webapps@2432 340c8d12-0b0e-0410-8428-c7bf67bfef74
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Hixie committed Nov 25, 2008
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<div class=head>
<p><a class=logo href=http://www.whatwg.org/ rel=home><img alt=WHATWG src=/images/logo></a></p>
<h1>HTML 5</h1>
<h2 class="no-num no-toc" id=draft-recommendation-&mdash;-date:-01-jan-1901>Draft Recommendation &mdash; 24 November 2008</h2>
<h2 class="no-num no-toc" id=draft-recommendation-&mdash;-date:-01-jan-1901>Draft Recommendation &mdash; 25 November 2008</h2>
<p>You can take part in this work. <a href=http://www.whatwg.org/mailing-list>Join the working group's discussion list.</a></p>
<p><strong>Web designers!</strong> We have a <a href=http://blog.whatwg.org/faq/>FAQ</a>, a <a href=http://forums.whatwg.org/>forum</a>, and a <a href=http://www.whatwg.org/mailing-list#help>help mailing list</a> for you!</p>
<dl><dt>Multiple-page version:</dt>
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<li><a href=#multipart-form-data><span class=secno>4.10.15.4 </span>Multipart form data</a></li>
<li><a href=#plain-text-form-data><span class=secno>4.10.15.5 </span>Plain text form data</a></ol></li>
<li><a href=#resetting-a-form><span class=secno>4.10.16 </span>Resetting a form</a></li>
<li><a href=#event-dispatch><span class=secno>4.10.17 </span>Event dispatch</a></ol></li>
<li><a href=#event-dispatch><span class=secno>4.10.17 </span>Event dispatch</a></li>
<li><a href=#login-forms><span class=secno>4.10.18 </span>Login forms</a></ol></li>
<li><a href=#interactive-elements><span class=secno>4.11 </span>Interactive elements</a>
<ol>
<li><a href=#the-details-element><span class=secno>4.11.1 </span>The <code>details</code> element</a></li>
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<a href=#tree-order>tree order</a>, <a href=#fire-a-simple-event>fire a simple event</a> named
<var title="">event name</var> at the element.</li>

</ol><h3 id=interactive-elements><span class=secno>4.11 </span>Interactive elements</h3>
</ol><h4 id=login-forms><span class=secno>4.10.18 </span>Login forms</h4>

<p>A common use for forms is user authentication. To indicate that
an HTTP <a href=#url>URL</a> requires authentication through such a form
before use, the HTTP 401 response code with a <code title="">WWW-Authenticate</code> challenge "<code title="">HTML</code>" may be used.</p>

<p>For this authentication scheme, the framework defined in RFC2617
is used as follows. <a href=#refsRFC2617>[RFC2617]</a></p>

<pre><dfn id=bnf-formauth-challenge title=bnf-formauth-challenge>challenge</dfn> = "<code title="">HTML</code>" [ <a href=#bnf-formauth-form title=bnf-formauth-form>form</a> ]
<dfn id=bnf-formauth-form title=bnf-formauth-form>form</dfn> = "<code title="">form</code>" "<code title="">=</code>" <a href=#bnf-formauth-form-name title=bnf-formauth-form-name>form-name</a>
<dfn id=bnf-formauth-form-name title=bnf-formauth-form-name>form-name</dfn> = quoted-string</pre>

<p>The <a href=#bnf-formauth-form title=bnf-formauth-form>form</a> parameter, if
present, indicates that the first <code><a href=#the-form-element>form</a></code> element in the
entity body whose <a href=#attr-form-name title=attr-form-name>name</a> is the
specified string, in <a href=#tree-order>tree order</a>, if any, is the login
form. If the parameter is omitted, then the first <code><a href=#the-form-element>form</a></code>
element in the entity body, in <a href=#tree-order>tree order</a>, if any, is
the login form.</p>

<p>There is no <code title="">credentials</code> production for this
scheme because the login information is to be sent as a normal form
submission and not using the <code title="">Authorization</code>
HTTP header.</p>

<p>This authentication scheme must only be used for entities whose
bodies contain HTML or XML with at least one <code><a href=#the-form-element>form</a></code>
element.</p>

<p class=note>Pages that include a login form but are not
protected by the login form (and for which a 401 response would
therefore be inappropriate) can have an "<code title="">HTML</code>"
challenge included in a <code title="">WWW-Authenticate</code>
header even though the response code is not 401. This allows user
agents to identify login forms on pages even when the user might not
want to log in.</p>




<h3 id=interactive-elements><span class=secno>4.11 </span>Interactive elements</h3>

<h4 id=the-details-element><span class=secno>4.11.1 </span>The <dfn><code>details</code></dfn> element</h4>

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</ol>


<h4>Login forms</h4>

<p>A common use for forms is user authentication. To indicate that
an HTTP <span>URL</span> requires authentication through such a form
before use, the HTTP 401 response code with a <code
title="">WWW-Authenticate</code> challenge "<code
title="">HTML</code>" may be used.</p>

<p>For this authentication scheme, the framework defined in RFC2617
is used as follows. <a href="#refsRFC2617">[RFC2617]</a></p>

<pre><dfn title="bnf-formauth-challenge">challenge</dfn> = "<code title="">HTML</code>" [ <span title="bnf-formauth-form">form</span> ]
<dfn title="bnf-formauth-form">form</dfn> = "<code title="">form</code>" "<code title="">=</code>" <span title="bnf-formauth-form-name">form-name</span>
<dfn title="bnf-formauth-form-name">form-name</dfn> = quoted-string</pre>

<p>The <span title="bnf-formauth-form">form</span> parameter, if
present, indicates that the first <code>form</code> element in the
entity body whose <span title="attr-form-name">name</span> is the
specified string, in <span>tree order</span>, if any, is the login
form. If the parameter is omitted, then the first <code>form</code>
element in the entity body, in <span>tree order</span>, if any, is
the login form.</p>

<p>There is no <code title="">credentials</code> production for this
scheme because the login information is to be sent as a normal form
submission and not using the <code title="">Authorization</code>
HTTP header.</p>

<p>This authentication scheme must only be used for entities whose
bodies contain HTML or XML with at least one <code>form</code>
element.</p>

<p class="note">Pages that include a login form but are not
protected by the login form (and for which a 401 response would
therefore be inappropriate) can have an "<code title="">HTML</code>"
challenge included in a <code title="">WWW-Authenticate</code>
header even though the response code is not 401. This allows user
agents to identify login forms on pages even when the user might not
want to log in.</p>




<h3 id="interactive-elements">Interactive elements</h3>
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