diff --git a/lib/keyserver-conn/call-single-keyserver-endpoint.js b/lib/keyserver-conn/call-single-keyserver-endpoint.js
--- a/lib/keyserver-conn/call-single-keyserver-endpoint.js
+++ b/lib/keyserver-conn/call-single-keyserver-endpoint.js
@@ -1,5 +1,6 @@
 // @flow
 
+import invariant from 'invariant';
 import _isEqual from 'lodash/fp/isEqual.js';
 
 import {
@@ -77,6 +78,13 @@
   platformDetails?: PlatformDetails,
 };
 
+let jsonUserInfoHandler = null;
+export const registerJsonUserInfoHandler = (
+  handler: (CallSingleKeyserverEndpointResponse, Endpoint) => void,
+) => {
+  jsonUserInfoHandler = handler;
+};
+
 async function callSingleKeyserverEndpoint(
   cookie: ?string,
   setNewSession: (sessionChange: ClientSessionChange, error: ?string) => void,
@@ -201,6 +209,8 @@
       json = await Promise.race([callEndpointPromise, rejectPromise]);
     }
   }
+  invariant(jsonUserInfoHandler, 'jsonUserInfoHandler should be registered');
+  jsonUserInfoHandler(json, endpoint);
 
   const { cookieChange, error, payload, currentUserInfo } = json;
   const sessionChange: ?ServerSessionChange = cookieChange;
diff --git a/native/root.react.js b/native/root.react.js
--- a/native/root.react.js
+++ b/native/root.react.js
@@ -33,8 +33,10 @@
 import PrekeysHandler from 'lib/components/prekeys-handler.react.js';
 import { StaffContextProvider } from 'lib/components/staff-provider.react.js';
 import { DBOpsHandler } from 'lib/handlers/db-ops-handler.react.js';
+import { httpMessageUserInfosHandler } from 'lib/handlers/http-message-user-infos-handler.js';
 import { IdentitySearchProvider } from 'lib/identity-search/identity-search-context.js';
 import { CallKeyserverEndpointProvider } from 'lib/keyserver-conn/call-keyserver-endpoint-provider.react.js';
+import { registerJsonUserInfoHandler } from 'lib/keyserver-conn/call-single-keyserver-endpoint.js';
 import KeyserverConnectionsHandler from 'lib/keyserver-conn/keyserver-connections-handler.js';
 import { TunnelbrokerProvider } from 'lib/tunnelbroker/tunnelbroker-context.js';
 import { actionLogger } from 'lib/utils/action-logger.js';
@@ -95,6 +97,8 @@
 
 SplashScreen.preventAutoHideAsync().catch(console.log);
 
+registerJsonUserInfoHandler(httpMessageUserInfosHandler);
+
 function Root() {
   const navStateRef = React.useRef<?PossiblyStaleNavigationState>();
   const navDispatchRef =
diff --git a/web/root.js b/web/root.js
--- a/web/root.js
+++ b/web/root.js
@@ -14,7 +14,9 @@
 import IntegrityHandler from 'lib/components/integrity-handler.react.js';
 import PrekeysHandler from 'lib/components/prekeys-handler.react.js';
 import ReportHandler from 'lib/components/report-handler.react.js';
+import { httpMessageUserInfosHandler } from 'lib/handlers/http-message-user-infos-handler.js';
 import { CallKeyserverEndpointProvider } from 'lib/keyserver-conn/call-keyserver-endpoint-provider.react.js';
+import { registerJsonUserInfoHandler } from 'lib/keyserver-conn/call-single-keyserver-endpoint.js';
 import KeyserverConnectionsHandler from 'lib/keyserver-conn/keyserver-connections-handler.js';
 import { reduxLoggerMiddleware } from 'lib/utils/action-logger.js';
 import { getWagmiConfig } from 'lib/utils/wagmi-utils.js';
@@ -37,6 +39,8 @@
 
 localforage.config(localforageConfig);
 
+registerJsonUserInfoHandler(httpMessageUserInfosHandler);
+
 const persistedReducer = persistReducer(persistConfig, reducer);
 const store: Store<AppState, Action> = createStore(
   persistedReducer,