From 5813b43f6bdaa388d7f84085a16450cba265a5cd Mon Sep 17 00:00:00 2001
From: Asier Isayas <aisayas@microsoft.com>
Date: Tue, 11 Aug 2026 11:51:58 -0400
Subject: [PATCH] Drop unused mongodb:// branch from endpoint host extraction

---
 src/Platform/Hosted/Components/ConnectExplorer.tsx  |  5 +++--
 .../Hosted/Helpers/ConnectionStringParser.ts        |  4 +---
 src/Platform/Hosted/HostedUtils.ts                  | 13 ++-----------
 3 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/src/Platform/Hosted/Components/ConnectExplorer.tsx b/src/Platform/Hosted/Components/ConnectExplorer.tsx
index 46fcd89bf..c9fa6db4a 100644
--- a/src/Platform/Hosted/Components/ConnectExplorer.tsx
+++ b/src/Platform/Hosted/Components/ConnectExplorer.tsx
@@ -64,8 +64,9 @@ export const validateDirectConnectionStringConnectivity = async (
     return t(Keys.connectExplorer.errors.connectivityInvalid);
   }
 
-  // Configure the client the same way the Data Explorer will, then issue a lightweight authenticated
-  // request. The Cosmos client signs locally with the master key and routes through the same proxy.
+  // The Cosmos client reads its connection settings from userContext, so write the master key and
+  // endpoint there. Then we issue a lightweight authenticated read to confirm the
+  // credentials work.
   updateUserContext({
     authType: AuthType.ConnectionString,
     masterKey,
diff --git a/src/Platform/Hosted/Helpers/ConnectionStringParser.ts b/src/Platform/Hosted/Helpers/ConnectionStringParser.ts
index 74421a8ee..e8270b868 100644
--- a/src/Platform/Hosted/Helpers/ConnectionStringParser.ts
+++ b/src/Platform/Hosted/Helpers/ConnectionStringParser.ts
@@ -45,9 +45,7 @@ export function parseConnectionString(connectionString: string): AccessInputMeta
       }
 
       // For the APIs that log in directly through the Cosmos client (SQL, Tables, Gremlin), derive the
-      // endpoints client-side instead of Portal Backend's accessinputmetadata call. Tables
-      // connection strings only carry the table endpoint, so the document endpoint is always constructed
-      // from the account name. Gremlin also needs its graph endpoint for websocket queries.
+      // endpoints client-side instead of Portal Backend's accessinputmetadata call.
       if (accessInput.accountName) {
         if (
           accessInput.apiKind === ApiKind.SQL ||
diff --git a/src/Platform/Hosted/HostedUtils.ts b/src/Platform/Hosted/HostedUtils.ts
index 1e3675a0e..fc9e21ecb 100644
--- a/src/Platform/Hosted/HostedUtils.ts
+++ b/src/Platform/Hosted/HostedUtils.ts
@@ -55,8 +55,7 @@ export function extractAccountKeyFromConnectionString(connectionString: string):
 }
 
 // SQL, Tables, and Gremlin can sign data-plane requests client-side with the account key, so they do
-// not need the Portal Backend proxy for connection-string login. Mongo and Cassandra still require the
-// proxy because they use wire protocols the browser cannot speak directly.
+// not need the Portal Backend proxy for connection-string login. Mongo and Cassandra still require the proxy.
 export function isDirectConnectionStringLoginApi(apiKind: ApiKind): boolean {
   return apiKind === ApiKind.SQL || apiKind === ApiKind.Table || apiKind === ApiKind.Graph;
 }
@@ -86,19 +85,11 @@ function extractHostToken(value: string, startIndex: number): string {
 }
 
 // Extracts the endpoint host from a connection string, mirroring ExtractEndpointHost in the Portal
-// Backend. Handles AccountEndpoint/TableEndpoint (URI or bare host), HostName, and mongodb:// segments.
+// Backend. Handles AccountEndpoint/TableEndpoint (URI or bare host) and HostName.
 export function extractEndpointHostFromConnectionString(connectionString: string): string | undefined {
   for (const part of connectionString.split(";")) {
     const trimmed = part.trim();
 
-    if (trimmed.toLowerCase().startsWith("mongodb://")) {
-      const atIndex = trimmed.indexOf("@");
-      if (atIndex >= 0 && atIndex < trimmed.length - 1) {
-        return extractHostToken(trimmed, atIndex + 1);
-      }
-      continue;
-    }
-
     const equalsIndex = trimmed.indexOf("=");
     if (equalsIndex < 0 || equalsIndex === trimmed.length - 1) {
       continue;