```Python hl_lines="35"
{!../../../docs_src/openapi_callbacks/tutorial001.py!}
```

!!! tip
    Notice that you are not passing the router itself (`invoices_callback_router`) to `callback=`, but the attribute `.routes`, as in `invoices_callback_router.routes`.

### Check the docs

    address = ":9999"

[providers]
  [providers.file]
    filename = "routes.toml"
```

This tells Traefik to listen on port 9999 and to use another file `routes.toml`.

!!! tip
    We are using port 9999 instead of the standard HTTP port 80 so that you don't have to run it with admin (`sudo`) privileges.

Now create that other file `routes.toml`:

```TOML hl_lines="5  12  20"
[http]
  [http.middlewares]

func forEachLoopbackRoute(cfg *Config, f func(*netlink.Route) error) error {
	loopbackLink, err := netlink.LinkByName("lo")
	if err != nil {
		return fmt.Errorf("failed to find 'lo' link: %v", err)
	}

	// Set up netlink routes for localhost
	cidrs := []string{"0.0.0.0/0"}
	if cfg.EnableIPv6 {
		cidrs = append(cidrs, "0::0/0")
	}
	for _, fullCIDR := range cidrs {
		_, localhostDst, err := net.ParseCIDR(fullCIDR)
		if err != nil {

### Based on open standards

* <a href="https://github.com/OAI/OpenAPI-Specification" class="external-link" target="_blank"><strong>OpenAPI</strong></a> for API creation, including declarations of <abbr title="also known as: endpoints, routes">path</abbr> <abbr title="also known as HTTP methods, as POST, GET, PUT, DELETE">operations</abbr>, parameters, body requests, security, etc.

        "ips": [
            {
                "version": "4",
                "address": "10.0.0.2/24",
                "gateway": "10.0.0.1",
                "interface": 0
            }
        ],
        "routes": []

    },
    "log_level": "debug",
    "cni_event_address": "%s",
    "ambient_enabled": %t,
    "kubernetes": {
        "k8s_api_root": "APIRoot",
        "kubeconfig": "testK8sConfig",

Você verá a resposta JSON como:

```JSON
{"item_id": 5, "q": "somequery"}
```

Você acabou de criar uma API que:

* Recebe requisições HTTP nas _rotas_ `/` e `/items/{item_id}`.
* Ambas _rotas_ fazem operações `GET` (também conhecido como _métodos_ HTTP).
* A _rota_ `/items/{item_id}` tem um _parâmetro de rota_ `item_id` que deve ser um `int`.

		// and the initial enqueueNamespace, and new pods will be handled by the CNI.

	case controllers.EventUpdate:
		// For update, we just need to handle opt outs
		newPod := event.New.(*corev1.Pod)
		oldPod := event.Old.(*corev1.Pod)
		ns := s.namespaces.Get(newPod.Namespace, "")
		if ns == nil {
			return fmt.Errorf("failed to find namespace %v", ns)
		}

func initTestAPIEndPoints(objLayer ObjectLayer, apiFunctions []string) http.Handler {
	// initialize a new mux router.
	// goriilla/mux is the library used to register all the routes and handle them.
	muxRouter := mux.NewRouter().SkipClean(true).UseEncodedPath()
	if len(apiFunctions) > 0 {
		// Iterate the list of API functions requested for and register them in mux HTTP handler.

				Bucket:    bucket,
				SSEConfig: &sseConfigStr,
				UpdatedAt: tm,
			})
			if err != nil {
				return errSRBucketMetaError(err)
			}
		}

		// Replicate existing bucket quotas settings
		quotaConfigJSON, tm := meta.QuotaConfigJSON, meta.QuotaConfigUpdatedAt
		if len(quotaConfigJSON) > 0 {
			err = c.BucketMetaHook(ctx, madmin.SRBucketMeta{
				Type:      madmin.SRBucketMetaTypeQuotaConfig,

Taehoon Lee, Takeshi Watanabe, TengLu, terryky, TheMindVirus, ThisIsIsaac, Till
Hoffmann, Timothy Liu, Tomer Gafner, Tongxuan Liu, Trent Lo, Trevor Morris, Uday
Bondhugula, Vasileios Lioutas, vbvg2008, Vishnuvardhan Janapati, Vivek
Suryamurthy, Wei Wang, Wen-Heng (Jack) Chung, wenxizhu, William D. Irons,
winstonq, wyzhao, Xiaoming (Jason) Cui, Xinan Jiang, Xinping Wang, Yann-Yy,