## 自訂 `PNGStreamingResponse` { #a-custom-pngstreamingresponse }

在上述範例中，雖然串流了資料位元組，但回應沒有 `Content-Type` 標頭，因此用戶端不知道接收到的是哪種資料型別。

你可以建立 `StreamingResponse` 的自訂子類別，將 `Content-Type` 標頭設定為你要串流的資料型別。

例如，你可以建立 `PNGStreamingResponse`，透過 `media_type` 屬性把 `Content-Type` 設為 `image/png`：

{* ../../docs_src/stream_data/tutorial002_py310.py ln[6,19:20] hl[20] *}

    assertThat(cache.hitCount()).isEqualTo(0)
  }

  private fun corruptCertificate(cacheEntry: Path) {
    var content = fileSystem.source(cacheEntry).buffer().readUtf8()
    content = content.replace("MII", "!!!")
    fileSystem
      .sink(cacheEntry)
      .buffer()
      .writeUtf8(content)
      .close()
  }

  /**
   * A network interceptor strips the handshake from a real HTTPS response before the

     */
    protected List<Artifact> loadArtifactsFromRepository(final String url) {
        final String content = getRepositoryContent(url);
        final ObjectMapper objectMapper = new YAMLMapper();
        try {
            @SuppressWarnings("unchecked")
            final List<Map<?, ?>> result = objectMapper.readValue(content, List.class);
            if (result != null) {

    /**
     * Test convertWithFieldCheck() adds query text to context.
     */
    @Test
    public void test_convertWithFieldCheck_addsToContext() {
        FessConfig fessConfig = ComponentUtil.getFessConfig();
        QueryContext context = new QueryContext("test", true);

        String queryText = "search term";
        queryCommand.convertWithFieldCheck(fessConfig, context, "title", queryText, 1.0f,

                                    <label for="doc.content" class="col-sm-3 text-sm-right col-form-label">content</label>
                                    <div class="col-sm-9">
                                        <la:errors property="doc.content"/>
                                        <la:text styleId="doc.content" property="doc.content" styleClass="form-control"/>
                                    </div>

    description: "Testing of the Elasticsearch %BRANCH% third party tests against GeoIP database service\n"
    builders:
      - inject:
          properties-file: '.ci/java-versions.properties'
          properties-content: |
            JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
            RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
            geoip_use_service=true
      - shell: |
          #!/usr/local/bin/runbld --redirect-stderr

├── constants/                  # Field names, constants
├── exception/                  # Custom exceptions
├── index/
│   ├── SuggestIndexer.java    # Indexing operations
│   ├── contents/              # Content parsers
│   └── writer/                # Index writers
├── request/
│   ├── suggest/               # Suggestion queries
│   └── popularwords/          # Popular word queries

	default:
		return crypto.ObjectKey{}, fmt.Errorf("encryption type '%v' not supported", kind)
	}
}

func newEncryptReader(ctx context.Context, content io.Reader, kind crypto.Type, keyID string, key []byte, bucket, object string, metadata map[string]string, cryptoCtx kms.Context) (io.Reader, crypto.ObjectKey, error) {
	objectEncryptionKey, err := newEncryptMetadata(ctx, kind, keyID, key, bucket, object, metadata, cryptoCtx)

        StreamUtil.split(slackWebhookUrls, "[,\\s]").of(stream -> stream.filter(StringUtil::isNotBlank).forEach(url -> {
            try (CurlResponse response = Curl.post(url).header("Content-Type", "application/json").body(body).execute()) {
                if (response.getHttpStatusCode() == 200) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Sent {} to {}.", body, url);

    * Another example would be `201`, "Created". It is commonly used after creating a new record in the database.
    * A special case is `204`, "No Content".  This response is used when there is no content to return to the client, and so the response must not have a body.