*
   * With regular HTTP calls the request always completes sending before the response may begin
   * receiving. With duplex the request and response may be interleaved! That is, request body bytes
   * may be sent after response headers or body bytes have been received.
   *
   * Though any call may be initiated as a duplex call, only web servers that are specially
   * designed for this nonstandard interaction will use it. As of 2019-01, the only widely-used

// IsRequested returns true if the HTTP headers contains
// at least one SSE-KMS header.
func (ssekms) IsRequested(h http.Header) bool {
	if _, ok := h[xhttp.AmzServerSideEncryptionKmsID]; ok {
		return true
	}
	if _, ok := h[xhttp.AmzServerSideEncryptionKmsContext]; ok {
		return true
	}
	if _, ok := h[xhttp.AmzServerSideEncryption]; ok {
		// Return only true if the SSE header is specified and does not contain the SSE-S3 value

* Para pasar un cuerpo JSON, pasa un objeto de Python (por ejemplo, un `dict`) al parámetro `json`.
* Si necesitas enviar *Form Data* en lugar de JSON, usa el parámetro `data` en su lugar.
* Para pasar *headers*, usa un `dict` en el parámetro `headers`.
* Para *cookies*, un `dict` en el parámetro `cookies`.

	if len(p) == 0 {
		return 0, r.readErr(false)
	}

	r.mu.Lock()
	defer r.mu.Unlock()
	if err := r.readErr(true); err != nil {
		return 0, err
	}

	r.wg.Add(1)
	defer r.wg.Done()
	n, err = r.read(p)
	for err == ErrIsEmpty && r.block {
		r.writeCond.Wait()
		if err = r.readErr(true); err != nil {
			break
		}
		n, err = r.read(p)
	}

{* ../../docs_src/middleware/tutorial001_py39.py hl[8:9,11,14] *}

/// tip

Keep in mind that custom proprietary headers can be added <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" class="external-link" target="_blank">using the `X-` prefix</a>.

            int result2 = request.encode(buffer2, 50);

            // Both should succeed independently
            assertTrue(result1 > 0);
            assertTrue(result2 > 0);

            // Verify headers in both buffers
            for (int i = 0; i < 8; i++) {
                assertEquals((byte) 0xFF, buffer1[i]);
                assertEquals((byte) 0xFF, buffer2[50 + i]);
            }
        }
    }

/// info | Info

Der zusätzliche Header `WWW-Authenticate` mit dem Wert `Bearer`, den wir hier zurückgeben, ist ebenfalls Teil der Spezifikation.

Jeder HTTP-(Fehler-)Statuscode 401 „UNAUTHORIZED“ soll auch einen `WWW-Authenticate`-Header zurückgeben.

Im Fall von Bearer-Tokens (in unserem Fall) sollte der Wert dieses Headers `Bearer` lauten.

Sie können diesen zusätzlichen Header tatsächlich weglassen und es würde trotzdem funktionieren.

	UserTags string

	// List of individual parts, maximum size of upto 10,000
	Parts []ObjectPartInfo `json:"-"`

	// Implements writer and reader used by CopyObject API
	Writer       io.WriteCloser `json:"-" msg:"-"`
	Reader       *hash.Reader   `json:"-" msg:"-"`
	PutObjReader *PutObjReader  `json:"-" msg:"-"`

	metadataOnly bool
	versionOnly  bool // adds a new version, only used by CopyObject

		}

		readers := []io.Reader{}
		cumulativeSum := int64(0)
		for _, p := range oi.partLengths {
			readers = append(readers, NewDummyDataGen(p, cumulativeSum))
			cumulativeSum += p
		}

		refReader := io.LimitReader(ioutilx.NewSkipReader(io.MultiReader(readers...), off), length)
		if ok, msg := cmpReaders(refReader, rec.Body); !ok {

  }

  @Test
  fun headersPostWithHeaderOverrides() {
    setLevel(Level.HEADERS)
    extraNetworkInterceptor =
      Interceptor { chain: Interceptor.Chain ->
        chain.proceed(
          chain
            .request()
            .newBuilder()
            .header("Content-Length", "2")
            .header("Content-Type", "text/plain-ish")
            .build(),
        )
      }