Function createMcpExpressApp

createMcpExpressApp(options?: CreateMcpExpressAppOptions): Express
Creates an Express application pre-configured for MCP servers.

When the host is '127.0.0.1', 'localhost', or '::1' (the default is '127.0.0.1'), DNS rebinding protection middleware is automatically applied to protect against DNS rebinding attacks on localhost servers.
Parameters
- options: CreateMcpExpressAppOptions = {}
  Configuration options
Returns Express
A configured Express application
Example: Basic usage - defaults to 127.0.0.1 with DNS rebinding protection
```
const app = createMcpExpressApp();
```
Example: Custom host - DNS rebinding protection only applied for localhost hosts
```
const appOpen = createMcpExpressApp({ host: '0.0.0.0' }); // No automatic DNS rebinding protection
const appLocal = createMcpExpressApp({ host: 'localhost' }); // DNS rebinding protection enabled
```
Example: Custom allowed hosts for non-localhost binding
```
const app = createMcpExpressApp({ host: '0.0.0.0', allowedHosts: ['myapp.local', 'localhost'] });
```
- Defined in express.ts:53