---
title: Connect the Host and Ingress
description: Link the Endpoint implementation, publish its Catalog binding, and configure the Web Ingress Instance.
---

The Endpoint provider is not reachable until the Host links it and the resolved
App binds it to Ingress.

## 1. Link the Plugin crate

`#[lenso::plugin]` and `#[endpoint]` already generate the Descriptor, Capability
lowering, and linked factory. The crate root only needs to compile the Endpoint
module:

```rust title="src/lib.rs"
mod http;
```

Once the Host links this crate, `NativePluginRegistry::with_linked_factories()`
discovers the generated factory. `NativePluginFactory` is a Host/Adapter
extension seam, not the normal Web Plugin authoring API. `NativeModuleFactory`
is retired.

## 2. Publish the Catalog relationship

Publish the Endpoint Plugin and Web Ingress implementations in the Host Catalog. The Catalog
must permit this binding:

```text
lenso.web-ingress/web
  requires many lenso.http.endpoint@1
    -> company.greetings-http/api
```

Registration makes an implementation available. The Host Catalog owns defaults,
root Slots, and exact implementation policy. The App owner only configures or
disables the resulting Instances in `plugins/`.

## 3. Configure Ingress

Patch the Host-declared Ingress Instance:

```toml title="plugins/lenso.web-ingress/web.toml"
bind_address = "127.0.0.1:8080"
max_request_body_bytes = 1048576
max_request_head_bytes = 16384
max_concurrent_requests = 128
request_timeout_millis = 30000
```

Inspect the resolved result:

```sh
lenso plugins list --root ./my-app
lenso app show --root ./my-app
lenso app check --root ./my-app
```

`app show` must contain the Ingress Instance, the Greetings Endpoint Instance,
and the `many lenso.http.endpoint@1` binding between them. A TOML file cannot
create a Catalog relationship that the Host does not publish.

This step is complete when `app check` succeeds and the resolved App exposes
the exact Instance and binding identities. Continue with
[Prove the HTTP backend](/docs/web/web-testing).