Chaining an AI Governance Proxy Behind an Existing Corporate Egress Proxy

Why the two proxies must be designed together

The AI governance proxy is an added control layer, not a replacement for the egress proxy. The egress proxy remains the only path to the internet, so the two layers need to be designed as one chain rather than as independent products.

Decisions about TLS inspection, identity, and policy ownership affect both layers. Settling them together keeps the layers from duplicating or contradicting each other.

Topology options and trade-offs

The topology in this guide sends AI traffic through the governance proxy first. The governance proxy then uses the egress proxy as its upstream, so every request that leaves the network still passes through the corporate exit.

Reference request path

1. Client, agent, or tool runtimeSends AI traffic to the governance proxy by explicit configuration.
2. AI governance proxyApplies runtime policy to model, agent, and tool-call traffic and attaches identity and correlation data.
3. Corporate egress proxyEnforces allowlisting, network authentication, DLP, and logging as the sole exit.
4. AI model or tool endpointReceives only traffic that passed both layers.

Configure the key integration points

TLS and certificate trust

Decide on one place for content-level TLS inspection. Each runtime, including agent frameworks and tool servers, must trust the required CAs and connect without errors. The certificate chains seen at each hop should confirm that content is decrypted and inspected only at the intended points.

Identity propagation

Carry identity in authenticated headers between the layers. The governance proxy attaches identity and correlation data, so a single request can be traced across both proxies by one correlation ID, with user or agent identity present in both records.

Streaming behavior

Test streaming failures before rollout. Streaming responses should arrive incrementally, and long-running calls should not hit idle timeouts.

Divide policy responsibility to avoid conflicts

Split policy by responsibility. Each layer enforces the controls it is positioned to enforce, as summarized below.

Verify there are no bypass paths

The egress proxy is only effective as the sole exit if nothing can route around the governance proxy or the egress proxy. Test for bypass paths from clients, servers, and containers, and confirm that the egress proxy accepts AI destination traffic only from the governance proxy. The checklist below covers what to confirm before rollout.

Validation checklist before rollout

• Direct outbound connections to AI endpoints from clients, servers, and containers are blocked at the network layer.
• The egress proxy accepts AI destination traffic only from the governance proxy's source identity.
• Content is decrypted and inspected at the intended points only, confirmed by certificate chains seen at each hop.
• Each runtime, including agent frameworks and tool servers, trusts the required CAs and connects without errors.
• A single request can be traced across both proxies by one correlation ID, with user or agent identity present in both records.
• Streaming responses arrive incrementally, and long-running calls do not hit idle timeouts.