assertThat(request.header("Host")).isNull()
    assertThat(request.header("Accept-Encoding")).isNull()

    // No extra headers in the application's response.
    val response = client.newCall(request).execute()
    assertThat(request.header("Content-Encoding")).isNull()
    assertThat(response.body.string()).isEqualTo("abcabcabc")
  }

  @Test
  fun networkInterceptorsCanChangeRequestMethodFromGetToPost() {

) : DerAdapter<T> {
  init {
    require(tagClass >= 0)
    require(tag >= 0)
  }

  override fun matches(header: DerHeader): Boolean = header.tagClass == tagClass && header.tag == tag

  override fun fromDer(reader: DerReader): T {
    val peekedHeader = reader.peekHeader()
    if (peekedHeader == null || peekedHeader.tagClass != tagClass || peekedHeader.tag != tag) {
      if (isOptional) return defaultValue as T

	for {
		header, err := tr.Next()
		if err == io.EOF {
			break
		}
		if err != nil {
			t.Fatalf("Failed to read header: %s", err)
		}
		if header.Typeflag != TypeReg {
			t.Fatalf("Typeflag should've been %d, found %d", TypeReg, header.Typeflag)
		}
	}
}

// failOnceWriter fails exactly once and then always reports success.
type failOnceWriter bool

	}
	testCases := []testCase{
		// Test - 1 - small bufio reader.
		{
			bufio.NewReaderSize(readers[0], 16),
			errLineTooLong,
			nil,
			nil,
		},
		// Test - 2 - unexpected end of the reader.
		{
			bufio.NewReader(readers[1]),
			io.ErrUnexpectedEOF,
			nil,
			nil,
		},
		// Test - 3 - line too long bigger than 4k+1
		{
			bufio.NewReader(readers[2]),
			errLineTooLong,
			nil,
			nil,
		},

	}, {
		header:  &Header{Mode: 07777777},
		formats: FormatUSTAR | FormatPAX | FormatGNU,
	}, {
		header:  &Header{Mode: 07777777 + 1},
		formats: FormatGNU,
	}, {
		header:  &Header{Devmajor: -123},
		formats: FormatGNU,
	}, {
		header:  &Header{Devmajor: 1<<56 - 1},
		formats: FormatGNU,
	}, {
		header:  &Header{Devmajor: 1 << 56},
		formats: FormatUnknown,
	}, {
		header:  &Header{Devmajor: -1 << 56},

    val isUpgradeRequest =
      !hasRequestBody &&
        "upgrade".equals(request.header("Connection"), ignoreCase = true)
    try {
      exchange.writeRequestHeaders(request)

      if (hasRequestBody) {
        // If there's a "Expect: 100-continue" header on the request, wait for a "HTTP/1.1 100
        // Continue" response before transmitting the request body. If we don't get that, return

      networkHeaders: Headers,
    ): Headers {
      val result = Headers.Builder()

      for (index in 0 until cachedHeaders.size) {
        val fieldName = cachedHeaders.name(index)
        val value = cachedHeaders.value(index)
        if ("Warning".equals(fieldName, ignoreCase = true) && value.startsWith("1")) {
          // Drop 100-level freshness warnings.
          continue
        }

Estos son cualquier request `OPTIONS` con headers `Origin` y `Access-Control-Request-Method`.

En este caso, el middleware interceptará el request entrante y responderá con los headers CORS adecuados, y un response `200` o `400` con fines informativos.

### Requests simples

Cualquier request con un header `Origin`. En este caso, el middleware pasará el request a través de lo normal, pero incluirá los headers CORS adecuados en el response.

## Más info

		if e != nil {
			t.Errorf("(%d) failed to create http.Request, got %v", i, e)
		}

		// Do the same for the headers.
		for key, value := range testCase.headers {
			req.Header.Set(key, value)
		}

		// parse form.
		req.ParseForm()

		// Check if it matches!
		err := doesPresignedSignatureMatch(payloadSHA256, req, testCase.region, serviceS3)

      transparentGzip = true
      requestBuilder.header("Accept-Encoding", "gzip")
    }

    val cookies = cookieJar.loadForRequest(userRequest.url)
    if (cookies.isNotEmpty()) {
      requestBuilder.header("Cookie", cookieHeader(cookies))
    }

    if (userRequest.header("User-Agent") == null) {
      requestBuilder.header("User-Agent", USER_AGENT)
    }