From 3fd014ddadc2f4221ed8e9c6256c0543d503aaff Mon Sep 17 00:00:00 2001
From: Tanuj Mittal <tamitta@microsoft.com>
Date: Thu, 4 Feb 2021 15:25:13 +0530
Subject: [PATCH] Disable caching for config.json file (#421)

* Disable caching for config.json file

* Disable cache when fetching config.json
---
 src/ConfigContext.ts |  6 +++++-
 web.config           | 22 ++++++++++++++++++----
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/src/ConfigContext.ts b/src/ConfigContext.ts
index 39bf29003..66cc14d00 100644
--- a/src/ConfigContext.ts
+++ b/src/ConfigContext.ts
@@ -80,7 +80,11 @@ if (process.env.NODE_ENV === "development") {
 
 export async function initializeConfiguration(): Promise<ConfigContext> {
   try {
-    const response = await fetch("./config.json");
+    const response = await fetch("./config.json", {
+      headers: {
+        "If-None-Match": "", // disable client side cache
+      },
+    });
     if (response.status === 200) {
       try {
         const { allowedParentFrameOrigins, ...externalConfig } = await response.json();
diff --git a/web.config b/web.config
index 599176261..51421bfe9 100644
--- a/web.config
+++ b/web.config
@@ -34,26 +34,40 @@
         <clientCache cacheControlMode="DisableCache" />
       </staticContent>
     </system.webServer>
-   </location>
+  </location>
   <location path="hostedExplorer.html">
     <system.webServer>
       <staticContent>
         <clientCache cacheControlMode="DisableCache" />
       </staticContent>
     </system.webServer>
-   </location>
+  </location>
+  <location path="config.json">
+    <system.webServer>
+      <staticContent>
+        <clientCache cacheControlMode="DisableCache" />
+      </staticContent>
+    </system.webServer>
+  </location>
   <location path="mpac/explorer.html">
     <system.webServer>
       <staticContent>
         <clientCache cacheControlMode="DisableCache" />
       </staticContent>
     </system.webServer>
-   </location>
+  </location>
   <location path="mpac/hostedExplorer.html">
     <system.webServer>
       <staticContent>
         <clientCache cacheControlMode="DisableCache" />
       </staticContent>
     </system.webServer>
-   </location>
+  </location>
+  <location path="mpac/config.json">
+    <system.webServer>
+      <staticContent>
+        <clientCache cacheControlMode="DisableCache" />
+      </staticContent>
+    </system.webServer>
+  </location>
 </configuration>
\ No newline at end of file