RADIUS attribute from rfc5090

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Digest-URI

This attribute is used to transport the contents of the
         digest-uri directive or the URI of the HTTP-style request.  It
         MUST only be used in Access-Request and Accounting-Request
         packets.
   Type
         109 for Digest-URI
   Length
         >= 3
   Text
         If the HTTP-style request has an Authorization header, the
         RADIUS client puts the value of the uri directive found in the
         HTTP-style request Authorization header (known as "digest-uri-
         value" in) without surrounding
         quotes into this attribute.  If there is no Authorization
         header, the RADIUS client takes the value of the request URI
         from the HTTP-style request it wants to authenticate.

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