return func() (*[]istioVersion.ProxyInfo, error) {
		pi := []istioVersion.ProxyInfo{}
		for _, resource := range (*xdsResponse).Resources {
			switch resource.TypeUrl {
			case "type.googleapis.com/envoy.config.core.v3.Node":
				node := core.Node{}
				err := resource.UnmarshalTo(&node)
				if err != nil {
					return nil, fmt.Errorf("could not unmarshal Node: %w", err)
				}

# Bigger Applications - Multiple Files

If you are building an application or a web API, it's rarely the case that you can put everything in a single file.

**FastAPI** provides a convenience tool to structure your application while keeping all the flexibility.

/// info

If you come from Flask, this would be the equivalent of Flask's Blueprints.

///

## An example file structure

Let's say you have a file structure like this:

```

	for _, obs := range observations {
		// Send observations once every 1ms, to simulate delay between
		// observations. This is to test the channel based
		// synchronization used internally.
		select {
		case <-ticker.C:
			ttfbHist.With(prometheus.Labels{"api": obs.label}).Observe(obs.val)
		}
	}

	metrics := getHistogramMetrics(ttfbHist, getBucketTTFBDistributionMD(), false)

	if err := windows.GetVolumePathName(wpath, &wvolume[0], uint32(len(wvolume))); err != nil {
		mountPointCache.Store(path, false)
		return false
	}

	switch windows.GetDriveType(&wvolume[0]) {
	case windows.DRIVE_FIXED, windows.DRIVE_REMOVABLE, windows.DRIVE_REMOTE, windows.DRIVE_RAMDISK:
		// Recognize "fixed", "removable", "remote" and "ramdisk" drives as proper drives

			}
		}
	}
	return w.Flush()
}

func valueOrNA(value string) string {
	if value == "" {
		return "NA"
	}
	return value
}

func certNotExpired(cert *Cert) bool {
	// case where cert state is in either Initializing or Unavailable state
	if cert.ExpirationTime == "" && cert.ValidFrom == "" {
		return false
	}
	today := time.Now()
	expDate, err := time.Parse(time.RFC3339, cert.ExpirationTime)

pkg syscall (freebsd-riscv64), type InterfaceMulticastAddrMessage struct, Header IfmaMsghdr #53466
pkg syscall (freebsd-riscv64), type Iovec struct #53466
pkg syscall (freebsd-riscv64), type Iovec struct, Base *uint8 #53466
pkg syscall (freebsd-riscv64), type Iovec struct, Len uint64 #53466
pkg syscall (freebsd-riscv64), type Kevent_t struct #53466
pkg syscall (freebsd-riscv64), type Kevent_t struct, Data int64 #53466

This way you will be able to have things ordered and grouped correctly for the client code:

<img src="/img/tutorial/generate-clients/image06.png">

In this case you have:

* `ItemsService`
* `UsersService`

### Client Method Names

Right now the generated method names like `createItemItemsPost` don't look very clean:

```TypeScript

			},
		)
	}
	switch ga.outputFormat {
	case "short":
		w := new(tabwriter.Writer).Init(out, 0, 8, 3, ' ', 0)
		_, _ = fmt.Fprintln(w, "ACTIVE SCOPE\tDESCRIPTION\tLOG LEVEL")
		for _, sll := range resultScopeLogLevel {
			_, _ = fmt.Fprintf(w, "%s\t%s\t%s\n", sll.ScopeName, sll.Description, sll.LogLevel)
		}
		return w.Flush()
	case "json", "yaml":

Ó lè fi gbogbo àwọn wọ̀nyí sórí ẹrọ pẹ̀lú `pip install "fastapi[all]"`.

## Iwe-aṣẹ

            )
        else:
            return None

    def _create_credentials_fetcher(self):
        method = self.METHOD

        def fetch_credentials():
            # HTTP headers are case insensitive filter out
            # all duplicate headers and pick one.
            headers = {}
            headers['content-type'] = 'application/x-www-form-urlencoded'