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app.py

@@ -7,10 +7,12 @@ Architecture (matching PDF Viewer pattern):
 """
 
 from mcp.server.fastmcp import FastMCP
+from mcp.server.transport_security import TransportSecuritySettings
 from mcp.types import CallToolResult, TextContent
-import json
 
-mcp = FastMCP("render-html")
+mcp = FastMCP("render-html", transport_security=TransportSecuritySettings(
+    enable_dns_rebinding_protection=False,
+))
 
 # ── The viewer HTML app ──────────────────────────────────────────────
 # This is served as an MCP resource. The host renders it in a sandboxed