Merge pull request #213265 from derisen/patch-10

Update JS code snippet

Author: Court72

articles/active-directory/develop/app-resilience-continuous-access-evaluation.md

@@ -104,11 +104,20 @@ You can test your application by signing in a user to the application then using
 When these conditions are met, the app can extract the claims challenge from the API response header as follows: 
 
 ```javascript
-const authenticateHeader = response.headers.get('www-authenticate');
-const claimsChallenge = parseChallenges(authenticateHeader).claims;
-
-// ...
+try {
+  const response = await fetch(apiEndpoint, options);
+
+  if (response.status === 401 && response.headers.get('www-authenticate')) {
+    const authenticateHeader = response.headers.get('www-authenticate');
+    const claimsChallenge = parseChallenges(authenticateHeader).claims;
+    
+    // use the claims challenge to acquire a new access token...
+  }
+} catch(error) {
+  // ...
+}
 
+// helper function to parse the www-authenticate header
 function parseChallenges(header) {
     const schemeSeparator = header.indexOf(' ');
     const challenges = header.substring(schemeSeparator + 1).split(',');
@@ -126,24 +135,20 @@ function parseChallenges(header) {
 Your app would then use the claims challenge to acquire a new access token for the resource.
 
 ```javascript
+const tokenRequest = {
+    claims: window.atob(claimsChallenge), // decode the base64 string
+    scopes: ['User.Read']
+    account: msalInstance.getActiveAccount();
+};
+
 let tokenResponse;
 
 try {
-    tokenResponse = await msalInstance.acquireTokenSilent({
-        claims: window.atob(claimsChallenge), // decode the base64 string
-        scopes: scopes,  // e.g ['User.Read', 'Contacts.Read']
-        account: account, // current active account
-    });
-
+    tokenResponse = await msalInstance.acquireTokenSilent(tokenRequest);
 } catch (error) {
      if (error instanceof InteractionRequiredAuthError) {
-        tokenResponse = await msalInstance.acquireTokenPopup({
-            claims: window.atob(claimsChallenge), // decode the base64 string
-            scopes: scopes, // e.g ['User.Read', 'Contacts.Read']
-            account: account, // current active account
-        });
+        tokenResponse = await msalInstance.acquireTokenPopup(tokenRequest);
     }
-
 }
 ```
 
@@ -154,8 +159,7 @@ const msalConfig = {
     auth: {
         clientId: 'Enter_the_Application_Id_Here', 
         clientCapabilities: ["CP1"]
-        // the remaining settings
-        // ... 
+        // remaining settings...
     }
 }