diff --git a/src/ConfigContext.ts b/src/ConfigContext.ts
index e492a3d13..18346e838 100644
--- a/src/ConfigContext.ts
+++ b/src/ConfigContext.ts
@@ -1,14 +1,14 @@
 import {
   allowedAadEndpoints,
   allowedArcadiaEndpoints,
-  allowedArmEndpoints,
-  allowedBackendEndpoints,
   allowedEmulatorEndpoints,
   allowedGraphEndpoints,
   allowedHostedExplorerEndpoints,
   allowedJunoOrigins,
   allowedMongoBackendEndpoints,
   allowedMsalRedirectEndpoints,
+  defaultAllowedArmEndpoints,
+  defaultAllowedBackendEndpoints,
   validateEndpoint,
 } from "Utils/EndpointValidation";
 
@@ -20,6 +20,8 @@ export enum Platform {
 
 export interface ConfigContext {
   platform: Platform;
+  allowedArmEndpoints: ReadonlyArray<string>;
+  allowedBackendEndpoints: ReadonlyArray<string>;
   allowedParentFrameOrigins: ReadonlyArray<string>;
   gitSha?: string;
   proxyPath?: string;
@@ -49,6 +51,8 @@ export interface ConfigContext {
 // Default configuration
 let configContext: Readonly<ConfigContext> = {
   platform: Platform.Portal,
+  allowedArmEndpoints: defaultAllowedArmEndpoints,
+  allowedBackendEndpoints: defaultAllowedBackendEndpoints,
   allowedParentFrameOrigins: [
     `^https:\\/\\/cosmos\\.azure\\.(com|cn|us)$`,
     `^https:\\/\\/[\\.\\w]*portal\\.azure\\.(com|cn|us)$`,
@@ -77,7 +81,7 @@ let configContext: Readonly<ConfigContext> = {
 
 export function resetConfigContext(): void {
   if (process.env.NODE_ENV !== "test") {
-    throw new Error("resetConfigContext can only becalled in a test environment");
+    throw new Error("resetConfigContext can only be called in a test environment");
   }
   configContext = {} as ConfigContext;
 }
@@ -87,7 +91,7 @@ export function updateConfigContext(newContext: Partial<ConfigContext>): void {
     return;
   }
 
-  if (!validateEndpoint(newContext.ARM_ENDPOINT, allowedArmEndpoints)) {
+  if (!validateEndpoint(newContext.ARM_ENDPOINT, configContext.allowedArmEndpoints || defaultAllowedArmEndpoints)) {
     delete newContext.ARM_ENDPOINT;
   }
 
@@ -107,7 +111,12 @@ export function updateConfigContext(newContext: Partial<ConfigContext>): void {
     delete newContext.ARCADIA_ENDPOINT;
   }
 
-  if (!validateEndpoint(newContext.BACKEND_ENDPOINT, allowedBackendEndpoints)) {
+  if (
+    !validateEndpoint(
+      newContext.BACKEND_ENDPOINT,
+      configContext.allowedBackendEndpoints || defaultAllowedBackendEndpoints
+    )
+  ) {
     delete newContext.BACKEND_ENDPOINT;
   }
 
@@ -130,7 +139,7 @@ export function updateConfigContext(newContext: Partial<ConfigContext>): void {
   Object.assign(configContext, newContext);
 }
 
-// Injected for local develpment. These will be removed in the production bundle by webpack
+// Injected for local development. These will be removed in the production bundle by webpack
 if (process.env.NODE_ENV === "development") {
   const port: string = process.env.PORT || "1234";
   updateConfigContext({
diff --git a/src/Utils/EndpointValidation.ts b/src/Utils/EndpointValidation.ts
index 25b805443..1e7740367 100644
--- a/src/Utils/EndpointValidation.ts
+++ b/src/Utils/EndpointValidation.ts
@@ -38,7 +38,7 @@ function validateEndpointInternal(
   return valid;
 }
 
-export const allowedArmEndpoints: ReadonlyArray<string> = [
+export const defaultAllowedArmEndpoints: ReadonlyArray<string> = [
   "https://​management.azure.com",
   "https://​management.usgovcloudapi.net",
   "https://management.chinacloudapi.cn",
@@ -46,7 +46,7 @@ export const allowedArmEndpoints: ReadonlyArray<string> = [
 
 export const allowedAadEndpoints: ReadonlyArray<string> = ["https://login.microsoftonline.com/"];
 
-export const allowedBackendEndpoints: ReadonlyArray<string> = [
+export const defaultAllowedBackendEndpoints: ReadonlyArray<string> = [
   "https://main.documentdb.ext.azure.com",
   "https://main.documentdb.ext.azure.cn",
   "https://main.documentdb.ext.azure.us",