Minimization round 3: the client asks eight properties on the
principal; addressbook-home-set is the only one discovery depends on
per our own docs, and round 2 already proved supported-report-set
dispensable on the collection.

Assisted-by: GLM 5.2 via pi

diff --git a/lib/pro_tacts/web.rb b/lib/pro_tacts/web.rb
index 4ca5cf6..258609b 100644
--- a/lib/pro_tacts/web.rb
+++ b/lib/pro_tacts/web.rb
@@ -131,24 +131,9 @@ module ProTacts
                   <d:href>/dav/principal/</d:href>
                   <d:propstat>
                     <d:prop>
-                      <d:displayname>Default Principal</d:displayname>
-                      <d:principal-URL>
-                        <d:href>/dav/principal/</d:href>
-                      </d:principal-URL>
-                      <d:resourcetype>
-                        <d:principal/>
-                      </d:resourcetype>
                       <card:addressbook-home-set>
                         <d:href>/dav/addressbook/</d:href>
                       </card:addressbook-home-set>
-                      <d:supported-report-set>
-                        <d:supported-report>
-                          <d:report><card:addressbook-multiget/></d:report>
-                        </d:supported-report>
-                        <d:supported-report>
-                          <d:report><card:addressbook-query/></d:report>
-                        </d:supported-report>
-                      </d:supported-report-set>
                     </d:prop>
                     <d:status>HTTP/1.1 200 OK</d:status>
                   </d:propstat>
diff --git a/test/fixtures/macos-exchange/04-propfind-principal/response b/test/fixtures/macos-exchange/04-propfind-principal/response
index 0f4e547..72a8a59 100644
--- a/test/fixtures/macos-exchange/04-propfind-principal/response
+++ b/test/fixtures/macos-exchange/04-propfind-principal/response
@@ -7,24 +7,9 @@ Content-Type: text/xml
     <d:href>/dav/principal/</d:href>
     <d:propstat>
       <d:prop>
-        <d:displayname>Default Principal</d:displayname>
-        <d:principal-URL>
-          <d:href>/dav/principal/</d:href>
-        </d:principal-URL>
-        <d:resourcetype>
-          <d:principal/>
-        </d:resourcetype>
         <card:addressbook-home-set>
           <d:href>/dav/addressbook/</d:href>
         </card:addressbook-home-set>
-        <d:supported-report-set>
-          <d:supported-report>
-            <d:report><card:addressbook-multiget/></d:report>
-          </d:supported-report>
-          <d:supported-report>
-            <d:report><card:addressbook-query/></d:report>
-          </d:supported-report>
-        </d:supported-report-set>
       </d:prop>
       <d:status>HTTP/1.1 200 OK</d:status>
     </d:propstat>