# 串流 JSON Lines { #stream-json-lines }

當你有一連串資料想以「**串流**」方式傳送時，可以使用 **JSON Lines**。

/// info

在 FastAPI 0.134.0 新增。

///

## 什麼是串流？ { #what-is-a-stream }

「**Streaming**」資料表示你的應用會在整個資料序列尚未完全準備好之前，就開始將資料項目傳送給用戶端。

也就是說，它會先送出第一個項目，用戶端接收並開始處理時，你的應用可能仍在產生下一個項目。

```mermaid
sequenceDiagram
    participant App
    participant Client

    App->>App: Produce Item 1
    App->>Client: Send Item 1

   * Powerpoint</a> presentations.
   */
  public static final MediaType MICROSOFT_POWERPOINT =
      createConstant(APPLICATION_TYPE, "vnd.ms-powerpoint");

  /**
   * <a
   * href="https://learn.microsoft.com/en-us/archive/blogs/vsofficedeveloper/office-2007-file-format-mime-types-for-http-content-streaming-2">Microsoft
   * Word</a> documents.
   */

- Objects must be in CSV, JSON, or Parquet(*) format.
- UTF-8 is the only encoding type the Select API supports.
- GZIP or BZIP2 - CSV and JSON files can be compressed using GZIP, BZIP2, [ZSTD](https://facebook.github.io/zstd/), and streaming formats of [LZ4](https://lz4.github.io/lz4/), [S2](https://github.com/klauspost/compress/tree/master/s2#s2-compression) and [SNAPPY](http://google.github.io/snappy/).

        } else if (bodyHasUnknownEncoding(response.headers)) {
          logger.log("<-- END HTTP (encoded body omitted)")
        } else if (bodyIsStreaming(response)) {
          logger.log("<-- END HTTP (streaming)")
        } else if (responseBody is UnreadableResponseBody) {
          logger.log("<-- END HTTP (unreadable body)")
        } else {
          val source = responseBody.source()

arrive, the stream is closed, or a timeout elapses. If we get bytes but there's nobody asking for them, we buffer them. We don't consider bytes as delivered for flow control until they're consumed by the application.

Consider an application streaming a video over http/2. Perhaps the user pauses the video and the application stops reading bytes from this stream. The buffer will fill up, and flow control prevents the server from sending more data on this stream. When the user unpauses her video...

const (
	// SHA256 represents the SHA-256 hash function
	SHA256 BitrotAlgorithm = 1 + iota
	// HighwayHash256 represents the HighwayHash-256 hash function
	HighwayHash256
	// HighwayHash256S represents the Streaming HighwayHash-256 hash function
	HighwayHash256S
	// BLAKE2b512 represents the BLAKE2b-512 hash function
	BLAKE2b512
)

// DefaultBitrotAlgorithm is the default algorithm used for bitrot protection.
const (

- Introduces new staging modules `k8s.io/streaming` and `k8s.io/cri-streaming` for Kubernetes streaming transport and CRI streaming server code.
  
  `k8s.io/apimachinery/pkg/util/httpstream` (including `spdy` and `wsstream`) remains available as a deprecated compatibility wrapper backed by `k8s.io/streaming`.
  

//
//	Authorization:
//
//	    Is skipped for obvious reasons
var ignoredHeaders = map[string]bool{
	"Authorization": true,
	"User-Agent":    true,
}

// Headers to ignore in streaming v4
var ignoredStreamingHeaders = map[string]bool{
	"Authorization": true,
	"Content-Type":  true,
	"Content-Md5":   true,
	"User-Agent":    true,
}

 * class to read a response that is larger than the entire memory allocated to the current process.
 * It can even stream a response larger than the total storage on the current device, which is a
 * common requirement for video streaming applications.
 *
 * Because this class does not buffer the full response in memory, the application may not
 * re-read the bytes of the response. Use this one shot to read the entire response into memory with

	github.com/muesli/termenv v0.16.0 // indirect
	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
	github.com/nats-io/jwt/v2 v2.7.4 // indirect
	github.com/nats-io/nats-streaming-server v0.24.6 // indirect
	github.com/nats-io/nkeys v0.4.11 // indirect
	github.com/nats-io/nuid v1.0.1 // indirect
	github.com/oklog/ulid v1.3.1 // indirect
	github.com/olekukonko/tablewriter v0.0.5 // indirect