Create functions with a name that starts with `test_` (this is standard `pytest` conventions).

Use the `TestClient` object the same way as you do with `httpx`.

Write simple `assert` statements with the standard Python expressions that you need to check (again, standard `pytest`).

{* ../../docs_src/app_testing/tutorial001_py39.py hl[2,12,15:18] *}

/// tip

          "fullMetaSearch": false,
          "hide": false,
          "includeNullMetadata": true,
          "instant": false,
          "legendFormat": "Pool {{pool}} / Set {{set}} - Write Quorum",
          "range": true,
          "refId": "C",
          "useBackend": false
        },
        {
          "datasource": {
            "type": "prometheus",

class package org.codehaus.plexus.util; public synchronized class StringOutputStream extends java.io.OutputStream { private StringBuffer buf; public void StringOutputStream(); public void write(byte[]) throws java.io.IOException; public void write(byte[], int, int) throws java.io.IOException; public void write(int) throws java.io.IOException; public String toString(); } org/codehaus/plexus/util/StringUtils.class package org.codehaus.plexus.util; public synchronized class StringUtils { public void...

var (
	ErrHeader          = errors.New("archive/tar: invalid tar header")
	ErrWriteTooLong    = errors.New("archive/tar: write too long")
	ErrFieldTooLong    = errors.New("archive/tar: header field too long")
	ErrWriteAfterClose = errors.New("archive/tar: write after close")
	ErrInsecurePath    = errors.New("archive/tar: insecure file path")

{* ../../docs_src/websockets/tutorial003_py39.py hl[79:81] *}

To try it out:

* Open the app with several browser tabs.
* Write messages from them.
* Then close one of the tabs.

That will raise the `WebSocketDisconnect` exception, and all the other clients will receive a message like:

```
Client #1596980209979 left the chat
```

 * Add URLStreamHandlerFactory support so that `URL.openConnection()` uses
   OkHttp.
 * Expose the transport ("http/1.1", "spdy/3", etc.) via magic request headers.
   Use `X-Android-Transports` to write the preferred transports and
   `X-Android-Selected-Transport` to read the negotiated transport.


## Version 1.0.2

_2013-05-11_

 * Fix: Remove use of Java 6-only APIs.

		response["buckets"] = bucketNames
		c, err := json.MarshalIndent(response, "", "\t")
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		w.Write(c)
	})

	address := fmt.Sprintf(":%v", port)
	log.Printf("listening on http://%s/", address)
	log.Fatal(http.ListenAndServe(address, nil))

// NewChecksumFromData returns a new Checksum, using specified algorithm type on data.
func NewChecksumFromData(t ChecksumType, data []byte) *Checksum {
	if !t.IsSet() {
		return nil
	}
	h := t.Hasher()
	h.Write(data)
	raw := h.Sum(nil)
	c := Checksum{Type: t, Encoded: base64.StdEncoding.EncodeToString(raw), Raw: raw}
	if !c.Valid() {
		return nil
	}
	return &c
}

          // Produced client Finished handshake message
          // Consuming server Finished handshake message
          // Produced ClientHello handshake message
          //
          // Raw write
          // Raw read
          // Plaintext before ENCRYPTION
          // Plaintext after DECRYPTION
          val message = record.message
          val parameters = record.parameters

`UploadFile` hat die folgenden `async`hronen Methoden. Sie alle rufen die entsprechenden Methoden des darunterliegenden Datei-Objekts auf (wobei intern `SpooledTemporaryFile` verwendet wird).

* `write(daten)`: Schreibt `daten` (`str` oder `bytes`) in die Datei.
* `read(anzahl)`: Liest `anzahl` (`int`) bytes/Zeichen aus der Datei.
* `seek(versatz)`: Geht zur Position `versatz` (`int`) in der Datei.