## Outros middlewares { #other-middlewares }

Há muitos outros middlewares ASGI.

Por exemplo:

* [`ProxyHeadersMiddleware` do Uvicorn](https://github.com/encode/uvicorn/blob/master/uvicorn/middleware/proxy_headers.py)
* [MessagePack](https://github.com/florimondmanca/msgpack-asgi)

	switch typed := v.(type) {
	case *MSS:
		trace.Path += typed.ToQuery()
	case map[string]string:
		m := MSS(typed)
		trace.Path += m.ToQuery()
	case *URLValues:
		trace.Path += typed.Values().Encode()
	case *NoPayload, *Bytes:
		trace.Path = fmt.Sprintf("%s?payload=%T", trace.Path, typed)
	case string:
		trace.Path = fmt.Sprintf("%s?%s", trace.Path, typed)
	default:
	}
	trace.HTTP.ReqInfo.Path = trace.Path

由於此函式不是 async，正確的回傳型別是 `Iterable[Item]`：

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[28:31] hl[29] *}

### 無回傳型別 { #no-return-type }

你也可以省略回傳型別。FastAPI 會使用 [`jsonable_encoder`](./encoder.md) 轉換資料並送出。

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[34:37] hl[35] *}

## `ServerSentEvent` { #serversentevent }

     * scope relationship function. Used by the graph conflict resolution policies
     *
     * @param scope a scope
     * @return true is supplied scope is an inclusive sub-scope of current one.
     */
    public boolean encloses(ArtifactScopeEnum scope) {
        final ArtifactScopeEnum s = checkScope(scope);

        // system scope is historic only - and simple
        if (id == system.id) {
            return scope.id == system.id;
        }

  private fun String.asciiToLowercase(): String =
    when {
      isAscii() -> lowercase(Locale.US)

      // This is an ASCII string.
      else -> this
    }

  /** Returns true if the [String] is ASCII encoded (0-127). */
  private fun String.isAscii() = length == utf8Size().toInt()

  /**
   * Returns true if [hostname] matches the domain name [pattern].
   *
   * @param hostname lower-case host name.

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[28:31] hl[29] *}

### Dönüş Tipi Olmadan { #no-return-type }

Dönüş tipini belirtmeyebilirsiniz. FastAPI, veriyi dönüştürmek ve göndermek için [`jsonable_encoder`](./encoder.md) kullanır.

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[34:37] hl[35] *}

## `ServerSentEvent` { #serversentevent }

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[28:31] hl[29] *}

### Без объявленного типа возврата { #no-return-type }

Вы также можете опустить тип возврата. FastAPI использует [`jsonable_encoder`](./encoder.md) для преобразования данных и их отправки.

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[34:37] hl[35] *}

## `ServerSentEvent` { #serversentevent }

import okhttp3.internal.http2.Header.Companion.TARGET_SCHEME_UTF8
import okhttp3.internal.immutableListOf
import okio.Sink
import okio.Socket
import okio.Source

/** Encode requests and responses using HTTP/2 frames. */
class Http2ExchangeCodec(
  client: OkHttpClient,
  override val carrier: Carrier,
  private val chain: RealInterceptorChain,
  private val http2Connection: Http2Connection,

		// io.Discard is just used to create the writer. Actual destination
		// writer is set later by Reset() before using it.
		return bufio.NewWriter(xioutil.Discard)
	},
}

// UnmarshalXML - decodes XML data.
func (c *CompressionType) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	var s string
	if err := d.DecodeElement(&s, &start); err != nil {
		return errMalformedXML(err)
	}

                    if (CharUtil.isUrlChar(c) || c == ' ') {
                        buf.append(c);
                    } else {
                        try {
                            buf.append(URLEncoder.encode(String.valueOf(c), Constants.UTF_8));
                        } catch (final UnsupportedEncodingException e) {
                            // NOP
                        }
                    }
                }