diff --git a/src/server/router/telemetry.ts b/src/server/router/telemetry.ts
index aabfe9b..a753c47 100644
--- a/src/server/router/telemetry.ts
+++ b/src/server/router/telemetry.ts
@@ -1,7 +1,7 @@
 import { Router } from 'express';
 import { query, validate } from '../middleware/validate';
 import { recordTelemetryEvent, sumTelemetryEvent } from '../model/telemetry';
-import { numify } from '../utils/common';
+import { generateETag, numify } from '../utils/common';
 import { makeBadge } from 'badge-maker';
 
 export const telemetryRouter = Router();
@@ -11,6 +11,9 @@ const blankGifBuffer = Buffer.from(
   'base64'
 );
 
+/**
+ * @deprecated please use route with telemetry id
+ */
 telemetryRouter.get(
   '/:workspaceId/blank.gif',
   validate(
@@ -24,6 +27,9 @@ telemetryRouter.get(
   }
 );
 
+/**
+ * @deprecated please use route with telemetry id
+ */
 telemetryRouter.get(
   '/:workspaceId/badge.svg',
   validate(
@@ -97,6 +103,7 @@ telemetryRouter.get(
         'Cache-Control',
         'no-cache,max-age=0,no-store,s-maxage=0,proxy-revalidate'
       )
+      .header('etag', generateETag(`${title}|${count}`))
       .status(200)
       .send(svg);
   }
diff --git a/src/server/utils/__tests__/common.test.ts b/src/server/utils/__tests__/common.test.ts
new file mode 100644
index 0000000..9bea001
--- /dev/null
+++ b/src/server/utils/__tests__/common.test.ts
@@ -0,0 +1,8 @@
+import { describe, expect, test } from 'vitest';
+import { md5 } from '../common';
+
+describe('md5', () => {
+  test('normal test', async () => {
+    expect(md5('Hello world')).toBe('3e25960a79dbc69b674cd4ec67a72c62');
+  });
+});
diff --git a/src/server/utils/__tests__/detect.test.ts b/src/server/utils/__tests__/detect.test.ts
index a723115..b5e9759 100644
--- a/src/server/utils/__tests__/detect.test.ts
+++ b/src/server/utils/__tests__/detect.test.ts
@@ -1,7 +1,9 @@
 import { describe, expect, test } from 'vitest';
 import { getLocation } from '../detect';
+import fs from 'fs-extra';
+import { libraryPath } from '../lib';
 
-describe('detect', () => {
+describe.runIf(fs.existsSync(libraryPath.geoPath))('detect', () => {
   describe('getLocation', () => {
     test('should detect local ip', async () => {
       const location = await getLocation('127.0.0.1');
@@ -18,7 +20,7 @@ describe('detect', () => {
       expect(location).toHaveProperty('city', 'Walnut');
       expect(location).toHaveProperty('longitude', -117.8512);
       expect(location).toHaveProperty('latitude', 34.0233);
-      expect(location).toHaveProperty('accuracy_radius', 20);
+      expect(location).toHaveProperty('accuracyRadius', 20);
     });
   });
 });
diff --git a/src/server/utils/common.ts b/src/server/utils/common.ts
index 39c9bce..0e42802 100644
--- a/src/server/utils/common.ts
+++ b/src/server/utils/common.ts
@@ -48,6 +48,14 @@ export function hashUuid(...args: string[]) {
   return v5(hash(...args), v5.DNS);
 }
 
+/**
+ * generate hash with md5
+ * which use in unimportant scene
+ */
+export function md5(input: string) {
+  return crypto.createHash('md5').update(input).digest('hex');
+}
+
 export function isValidDate(input: any) {
   return dayjs(input).isValid();
 }
@@ -240,3 +248,7 @@ export function numify(num: number): string {
 
   return result;
 }
+
+export function generateETag(data: string) {
+  return `"${md5(data)}"`;
+}