anchor.diff:      meck:expect(http_client, request, fun
           (
               mthd,
  -            "URL/URN",
  +            "OZ_URL:9443/PREFIX/URN",
               [?CONTENT_TYPE_HEADER, MH, DMH],
               body,
               [opts]
           ) when MH =:= MacaroonHeader, DMH =:= DischMacaroonsHeader -> ok;
           (
               mthd,
  -            "URL/URN",
  +            "OZ_URL:9443/PREFIX/URN",
               [?CONTENT_TYPE_HEADER, MH, DMH],
               body,
               [
  
positive.code:     meck:expect(http_client, request, fun
          (
              method,
              "URL/URN",
              [?CONTENT_TYPE_HEADER, MH, DMH, headers],
              body,
              [options]
          ) when MH =:= MacaroonHeader, DMH =:= DischMacaroonsHeader -> ok;
          (
              method,
              "URL/URN",
              [?CONTENT_TYPE_HEADER, MH, DMH, headers],
              body,
              [
  
negative.code:     meck:expect(http_client, request, fun
          (
              method,
              "OZ_URL:9443/PREFIX/URN",
              [?CONTENT_TYPE_HEADER, MH, DMH],
              body,
              []
          ) when MH =:= MacaroonHeader, DMH =:= DischMacaroonsHeader -> ok;
          (
              method,
              "OZ_URL:9443/PREFIX/URN",
              [?CONTENT_TYPE_HEADER, MH, DMH],
              body,
              [
  