more specific warning

etcd3/baseclient.py

@@ -81,15 +81,18 @@ def _retrieve_version(self):  # pragma: no cover
             r.raise_for_status()
             v = r.json()
             self.cluster_version = v["etcdcluster"]
+            if sem.Version(self.cluster_version) < sem.Version('3.2.2'):
+                warnings.warn(Etcd3Warning("detected etcd cluster version(%s) is lower than 3.2.2, "
+                                           "the gRPC-JSON-Gateway may not work" % self.cluster_version))
             if sem.Version(self.cluster_version) < sem.Version('3.3.0'):
                 warnings.warn(Etcd3Warning("detected etcd cluster version(%s) is lower than 3.3.0, "
-                                           "the gRPC-JSON-Gateway may not work" % self.cluster_version))
+                                           "authentication methods may not work" % self.cluster_version))
             else:
                 self.api_prefix = '/v3'
         except Exception:
             warnings.warn(Etcd3Warning("cannot detect etcd server version\n"
                                        "1. maybe is a network problem, please check your network connection\n"
-                                       "2. maybe your etcd server version is too low, required: 3.3.0+"))
+                                       "2. maybe your etcd server version is too low, required: 3.2.2+"))
 
     @property
     def baseurl(self):