Multi-Tenancy

Lambda Web Adapter supports multi-tenancy by automatically propagating the tenant ID from the Lambda runtime context to your web application.

How It Works

When the Lambda runtime includes a tenant_id in the invocation context, the adapter forwards it as an X-Amz-Tenant-Id HTTP header. If no tenant ID is present, the header is omitted.

Reading the Tenant ID

# FastAPI
@app.get("/")
def handler(request: Request):
    tenant_id = request.headers.get("x-amz-tenant-id")

// Express.js
app.get('/', (req, res) => {
    const tenantId = req.headers['x-amz-tenant-id'];
});

No additional configuration is required.