diff --git a/src/core/dicom-web-api.ts b/src/core/dicom-web-api.ts
index 0f24f709..cd24fe35 100644
--- a/src/core/dicom-web-api.ts
+++ b/src/core/dicom-web-api.ts
@@ -1,5 +1,6 @@
 import { cleanUndefined } from '@/src/utils';
 import { api } from 'dicomweb-client-typed';
+import { globalHeaders } from '@/src/utils/fetch';
 
 export interface FetchStudyOptions {
   studyInstanceUID: string;
@@ -66,8 +67,10 @@ function toFile(instance: ArrayBuffer) {
 }
 
 function makeClient(dicomWebRoot: string) {
+  const headers = Object.fromEntries(globalHeaders.entries());
   return new api.DICOMwebClient({
     url: dicomWebRoot,
+    headers,
   });
 }
 
diff --git a/src/utils/fetch.ts b/src/utils/fetch.ts
index fb82998f..b1432ef0 100644
--- a/src/utils/fetch.ts
+++ b/src/utils/fetch.ts
@@ -1,7 +1,7 @@
 import { parseUrl } from '@/src/utils/url';
 import { Awaitable } from '@vueuse/core';
 
-const globalHeaders = new Headers();
+export const globalHeaders = new Headers();
 
 export function setGlobalHeader(name: string, value: string) {
   globalHeaders.set(name, value);