## Traffic routing

Based on the three [redirection](#redirection) paths, the ztunnel has three primary types of traffic it handles.

### Outbound

Requests leaving a pod go through the "outbound" code path on port 15001.

                [FastAPI docs for Testing Dependencies with Overrides](https://fastapi.tiangolo.com/advanced/testing-dependencies/).
                """
            ),
        ] = {}
        self.router: routing.APIRouter = routing.APIRouter(
            routes=routes,
            redirect_slashes=redirect_slashes,
            dependency_overrides_provider=self,
            on_startup=on_startup,
            on_shutdown=on_shutdown,

👈 🌌, 🎏 🛣 🎓 💪 🍵 🗜 🗜 ⚖️ 🗜 📨.

```Python hl_lines="8-15"
{!../../../docs_src/custom_request_and_route/tutorial001.py!}
```

### ✍ 🛃 `GzipRoute` 🎓

⏭, 👥 ✍ 🛃 🏿 `fastapi.routing.APIRoute` 👈 🔜 ⚒ ⚙️ `GzipRequest`.

👉 🕰, ⚫️ 🔜 📁 👩‍🔬 `APIRoute.get_route_handler()`.

👉 👩‍🔬 📨 🔢. & 👈 🔢 ⚫️❔ 🔜 📨 📨 & 📨 📨.

📥 👥 ⚙️ ⚫️ ✍ `GzipRequest` ⚪️➡️ ⏮️ 📨.

这样就可以让同一个路由类处理 gzip 压缩的请求或未压缩的请求。

```Python hl_lines="8-15"
{!../../../docs_src/custom_request_and_route/tutorial001.py!}
```

### 创建自定义 `GzipRoute` 类

接下来，创建使用 `GzipRequest` 的 `fastapi.routing.APIRoute  ` 的自定义子类。

此时，这个自定义子类会覆盖 `APIRoute.get_route_handler()`。

`APIRoute.get_route_handler()` 方法返回的是函数，并且返回的函数接收请求并返回响应。

本例用它根据原始请求创建 `GzipRequest`。

```Python hl_lines="18-26"

  # auto-detect installed CRD definitions
  - apiGroups: ["apiextensions.k8s.io"]
    resources: ["customresourcedefinitions"]
    verbs: ["get", "list", "watch"]

  # discovery and routing
  - apiGroups: [""]
    resources: ["pods", "nodes", "services", "namespaces", "endpoints"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["discovery.k8s.io"]
    resources: ["endpointslices"]

   * @since 24.0
   */
  Set<EndpointPair<N>> incidentEdges(N node);

  /**
   * Returns the count of {@code node}'s incident edges, counting self-loops twice (equivalently,
   * the number of times an edge touches {@code node}).
   *
   * <p>For directed graphs, this is equal to {@code inDegree(node) + outDegree(node)}.
   *

- Sets up redirection with newly-started (or newly-added, previously-started) application pods such that traffic from application pods is forwarded to the local node's ztunnel pod.
- Configures required iptables, sockets, and packet routing miscellanea within the `ztunnel` and application pod network namespaces to make that happen.

This component accomplishes that in the following ways:

  # auto-detect installed CRD definitions
  - apiGroups: ["apiextensions.k8s.io"]
    resources: ["customresourcedefinitions"]
    verbs: ["get", "list", "watch"]

  # discovery and routing
  - apiGroups: [""]
    resources: ["pods", "nodes", "services", "namespaces", "endpoints"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["discovery.k8s.io"]
    resources: ["endpointslices"]

### 6. Configure Grafana

option go_package = "k8s.io/api/policy/v1";

// Eviction evicts a pod from its node subject to certain policies and safety constraints.
// This is a subresource of Pod.  A request to cause such an eviction is
// created by POSTing to .../pods/<pod name>/evictions.
message Eviction {
  // ObjectMeta describes the pod that is being evicted.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;