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<h1>Authentication</h1>

<p>Many applications need to restrict access to authorized users.  The HTTP 
server supports Basic HTTP Authentication to provide this functionality.</p>

<p>Two functions are involved with authentication, both of which store a
return value in <code>curHTTP.isAuthorized</code>.  The MSB of this value
indicates whether or not access is allowed.  The first callback, 
<code>HTTPNeedsAuth</code>, determines if the requested page requires
valid credentials to proceed.  Return a value of <code>0x80</code> or greater 
to allow access unconditionally.  Return <code>0x79</code> or lower to require 
authorization.</p>

The second, <code>HTTPVerifyAuth</code> determines if the supplied credentials 
are acceptable for the requested page.  Your application should return a value 
greater than <code>0x80</code> to permit access, or a value less than 
<code>0x79</code> to reject the password supplied.</p>

<p>As an example, access this restricted page:</p>

<div class="examplebox">
<b>User Name:</b> admin &nbsp; &nbsp; &nbsp; <b>Password:</b> microchip<br />
<a href="/protect">Access Restricted Page</a>
</div>

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