diff --git a/desktop/.eslintignore b/desktop/.eslintignore
index 08105f881..996a2974f 100644
--- a/desktop/.eslintignore
+++ b/desktop/.eslintignore
@@ -13,5 +13,6 @@ react-native/ReactNativeFlipperExample
 scripts/generate-changelog.js
 static/index.js
 static/defaultPlugins/*
+static/facebook/flipper-server-app-template
 generated
 flipper-server/static
diff --git a/desktop/flipper-server-core/src/server/startServer.tsx b/desktop/flipper-server-core/src/server/startServer.tsx
index 4531de67a..66bcf1f5f 100644
--- a/desktop/flipper-server-core/src/server/startServer.tsx
+++ b/desktop/flipper-server-core/src/server/startServer.tsx
@@ -22,6 +22,7 @@ import {validateAuthToken} from '../app-connectivity/certificate-exchange/certif
 import {tracker} from '../tracker';
 import {EnvironmentInfo, isProduction} from 'flipper-common';
 import {GRAPH_SECRET} from '../fb-stubs/constants';
+import {sessionId} from '../sessionId';
 
 type Config = {
   port: number;
@@ -151,7 +152,9 @@ async function startHTTPServer(
       const processedContent = content
         .toString()
         .replace('GRAPH_SECRET_REPLACE_ME', GRAPH_SECRET)
-        .replace('FLIPPER_APP_VERSION_REPLACE_ME', environmentInfo.appVersion);
+        .replace('FLIPPER_APP_VERSION_REPLACE_ME', environmentInfo.appVersion)
+        .replace('FLIPPER_UNIXNAME_REPLACE_ME', environmentInfo.os.unixname)
+        .replace('FLIPPER_SESSION_ID_REPLACE_ME', sessionId);
       res.end(processedContent);
     });
   });
diff --git a/desktop/flipper-ui-browser/src/global.tsx b/desktop/flipper-ui-browser/src/global.tsx
index 849b40a32..39705a833 100644
--- a/desktop/flipper-ui-browser/src/global.tsx
+++ b/desktop/flipper-ui-browser/src/global.tsx
@@ -18,6 +18,8 @@ declare global {
     };
     GRAPH_SECRET: string;
     FLIPPER_APP_VERSION: string;
+    FLIPPER_SESSION_ID: string;
+    FLIPPER_UNIXNAME: string;
 
     flipperShowMessage?(message: string): void;
     flipperHideMessage?(): void;
diff --git a/desktop/static/index.web.dev.html b/desktop/static/index.web.dev.html
index 90aa871b8..d5eda16f5 100644
--- a/desktop/static/index.web.dev.html
+++ b/desktop/static/index.web.dev.html
@@ -139,6 +139,8 @@
 
         window.GRAPH_SECRET = 'GRAPH_SECRET_REPLACE_ME';
         window.FLIPPER_APP_VERSION = 'FLIPPER_APP_VERSION_REPLACE_ME';
+        window.FLIPPER_SESSION_ID = 'FLIPPER_SESSION_ID_REPLACE_ME';
+        window.FLIPPER_UNIXNAME = 'FLIPPER_UNIXNAME_REPLACE_ME';
 
         const params = new URL(location.href).searchParams;
         let token = params.get('token');
diff --git a/desktop/static/index.web.html b/desktop/static/index.web.html
index d21b6b231..c724d7041 100644
--- a/desktop/static/index.web.html
+++ b/desktop/static/index.web.html
@@ -88,6 +88,8 @@
 
         window.GRAPH_SECRET = 'GRAPH_SECRET_REPLACE_ME';
         window.FLIPPER_APP_VERSION = 'FLIPPER_APP_VERSION_REPLACE_ME';
+        window.FLIPPER_SESSION_ID = 'FLIPPER_SESSION_ID_REPLACE_ME';
+        window.FLIPPER_UNIXNAME = 'FLIPPER_UNIXNAME_REPLACE_ME';
 
         // load correct theme (n.b. this doesn't handle system value specifically, will assume light in such cases)
         try {