From a6fd32a15aa1e7c511858c215fa31af9dedfdfc1 Mon Sep 17 00:00:00 2001
From: Danny Avila <danny@librechat.ai>
Date: Sun, 17 Aug 2025 13:23:46 -0400
Subject: [PATCH] =?UTF-8?q?=F0=9F=8F=B7=EF=B8=8F=20refactor:=20Normalize?=
 =?UTF-8?q?=20Request=20Headers=20in=20`setRequestHeaders`=20(#9106)?=
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---
 packages/api/src/mcp/connection.ts | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/packages/api/src/mcp/connection.ts b/packages/api/src/mcp/connection.ts
index 5f45bd8335..8e2eb00b4f 100644
--- a/packages/api/src/mcp/connection.ts
+++ b/packages/api/src/mcp/connection.ts
@@ -88,8 +88,17 @@ export class MCPConnection extends EventEmitter {
   url?: string;
 
   setRequestHeaders(headers: Record<string, string> | null): void {
-    logger.debug(`${this.getLogPrefix()} Setting request headers: ${JSON.stringify(headers)}`);
-    this.requestHeaders = headers;
+    if (!headers) {
+      return;
+    }
+    const normalizedHeaders: Record<string, string> = {};
+    for (const [key, value] of Object.entries(headers)) {
+      normalizedHeaders[key.toLowerCase()] = value;
+    }
+    logger.debug(
+      `${this.getLogPrefix()} Setting request headers: ${JSON.stringify(normalizedHeaders)}`,
+    );
+    this.requestHeaders = normalizedHeaders;
   }
 
   getRequestHeaders(): Record<string, string> | null | undefined {