- Akışın **cache'lenmesini önlemek** için `Cache-Control: no-cache` header'ını ayarlar.
- Nginx gibi bazı proxy'lerde **buffering'i önlemek** için özel `X-Accel-Buffering: no` header'ını ayarlar.

{* ../../docs_src/server_sent_events/tutorial005_py310.py hl[14] *}

## Технические детали { #technical-details }

FastAPI из коробки реализует некоторые лучшие практики для SSE.

	if m.outBlock == nil {
		// Closed
		return
	}
	select {
	case m.outBlock <- struct{}{}:
	default:
		gridLogIf(m.ctx, errors.New("output unblocked overflow"))
	}
}

func (m *muxServer) ping(seq uint32) pongMsg {
	if !m.checkSeq(seq) {
		msg := fmt.Sprintf("receive sequence number mismatch. want %d, got %d", m.RecvSeq, seq)
		return pongMsg{Err: &msg}
	}
	select {
	case <-m.ctx.Done():

["och", "det", "att", "i", "en", "jag", "hon", "som", "han", "på", "den", "med", "var", "sig", "för", "så", "till", "är", "men", "ett", "om", "hade", "de", "av", "icke", "mig", "du", "henne", "då", "sin", "nu", "har", "inte", "hans", "honom", "skulle", "hennes", "där", "min", "man", "ej", "vid", "kunde", "något", "från", "ut", "när", "efter", "upp", "vi", "dem", "vara", "vad", "över", "än", "dig", "kan", "sina", "här", "ha", "mot", "alla", "under", "någon", "eller", "allt", "mycket", "sedan", "ju",...

["och", "det", "att", "i", "en", "jag", "hon", "som", "han", "på", "den", "med", "var", "sig", "för", "så", "till", "är", "men", "ett", "om", "hade", "de", "av", "icke", "mig", "du", "henne", "då", "sin", "nu", "har", "inte", "hans", "honom", "skulle", "hennes", "där", "min", "man", "ej", "vid", "kunde", "något", "från", "ut", "när", "efter", "upp", "vi", "dem", "vara", "vad", "över", "än", "dig", "kan", "sina", "här", "ha", "mot", "alla", "under", "någon", "eller", "allt", "mycket", "sedan", "ju",...

import org.codelibs.fess.util.ComponentUtil;
import org.lastaflute.web.login.credential.LoginCredential;
import org.lastaflute.web.response.ActionResponse;

/**
 * Manager class for coordinating SSO (Single Sign-On) authentication operations.
 *
 * This class serves as the central coordinator for SSO authentication in Fess.
 * It manages registered SSO authenticators, determines when SSO is available,

        if (LogStream.level >= 5) {
            log.println("macSigningKey:");
            Hexdump.hexdump(log, macSigningKey, 0, macSigningKey.length);
        }
    }

    /**
     * Constructs a new signing digest using transport and authentication credentials.
     *
     * @param transport the SMB transport for this signing context
     * @param auth the NTLM password authentication credentials

{* ../../docs_src/server_sent_events/tutorial005_py310.py hl[14] *}

## 技術細節 { #technical-details }

FastAPI 內建實作了一些 SSE 的最佳實務。

- 當 15 秒內沒有任何訊息時，傳送一次**「保活」`ping` 註解**，以避免某些代理伺服器關閉連線；此作法源自於[HTML 規範：Server-Sent Events](https://html.spec.whatwg.org/multipage/server-sent-events.html#authoring-notes)中的建議。
- 設定 `Cache-Control: no-cache` 標頭，以**防止快取**串流內容。

            override fun contentLength() = 1024L * 1024L * 100L

            override fun writeTo(sink: BufferedSink) {
              val a1024x1024 = "a".repeat(1024 * 1024)
              repeat(100) {
                sink.writeUtf8(a1024x1024)
              }
            }
          },
        ).build()
    val buffer = Buffer()
    multipartBody.writeTo(buffer)

// are equal. The signatures are expected to be HEX encoded strings
// according to the AWS S3 signature V4 spec.
func compareSignatureV4(sig1, sig2 string) bool {
	// The CTC using []byte(str) works because the hex encoding
	// is unique for a sequence of bytes. See also compareSignatureV2.
	return subtle.ConstantTimeCompare([]byte(sig1), []byte(sig2)) == 1
}