### CORS preflight requests { #cors-preflight-requests }

These are any `OPTIONS` request with `Origin` and `Access-Control-Request-Method` headers.

In this case the middleware will intercept the incoming request and respond with appropriate CORS headers, and either a `200` or `400` response for informational purposes.

### Simple requests { #simple-requests }

        // Set fail counts (addr1 has more failures, addr2 has fewer)
        pool.failCounts.put("10.0.0.1", 5);
        pool.failCounts.put("10.0.0.2", 1);

        // Create spy to intercept calls
        SmbTransportPoolImpl poolSpy = spy(pool);
        when(ctx.getTransportPool()).thenReturn(poolSpy);

        // Mock transports
        SmbTransportImpl trans1 = mock(SmbTransportImpl.class);

    Note over Server: Server interprets headers<br/>(if --forwarded-allow-ips is set)

    Server->>Proxy: HTTP Response<br/>with correct HTTPS URLs

    Proxy->>Client: HTTPS Response
```

The **proxy** intercepts the original client request and adds the special *forwarded* headers (`X-Forwarded-*`) before passing the request to the **application server**.