/**
     * Returns the subset of the headers in [requestHeaders] that impact the content of the
     * response's body.
     */
    private fun varyHeaders(
      requestHeaders: Headers,
      responseHeaders: Headers,
    ): Headers {
      val varyFields = responseHeaders.varyFields()
      if (varyFields.isEmpty()) return Headers.EMPTY

      val result = Headers.Builder()

    /**
     * Builds the extract data from headers and rows.
     *
     * @param headers the header row
     * @param rows the data rows
     * @return the extract data
     */
    protected ExtractData buildExtractData(final String[] headers, final List<String[]> rows) {
        final StringBuilder textBuilder = new StringBuilder();

        // Add headers to text
        if (headers != null) {

    )
  }

  @Test fun pushPromise() {
    val expectedPromisedStreamId = 11
    val pushPromise =
      listOf(
        Header(Header.TARGET_METHOD, "GET"),
        Header(Header.TARGET_SCHEME, "https"),
        Header(Header.TARGET_AUTHORITY, "squareup.com"),
        Header(Header.TARGET_PATH, "/"),
      )

    // Write the push promise frame, specifying the associated stream ID.

      Request
        .Builder()
        .url(server.url("/"))
        .header("", "A")
        .build()
    }
  }

  @Test
  fun emptyResponseHeaderNameIsLenient() {
    val headers = Headers.Builder()
    addHeaderLenient(headers, ":A")
    server.enqueue(
      MockResponse(
        headers = headers.build(),
        body = "body",
      ),
    )

          response.request
            .newBuilder()
            .header("Authorization", "XYZ")
            .build()
        }.build()
    server.enqueue(
      MockResponse(
        code = 401,
        body = "{\"error\":{\"message\":\"No auth credentials found\",\"code\":401}}",
        headers = Headers.headersOf("content-type", "application/json"),
      ),
    )
    server.enqueue(

  }

  @Test
  fun headers() {
    var headers: Headers = headersOf("", "")
    headers = mapOf("" to "").toHeaders()
    val get: String? = headers[""]
    val date: Date? = headers.getDate("")
    val instant: Instant? = headers.getInstant("")
    val size: Int = headers.size
    val name: String = headers.name(0)
    val value: String = headers.value(0)
    val names: Set<String> = headers.names()

  }

  /** Returns bytes of a request header for sending on an HTTP transport. */
  fun writeRequest(
    headers: Headers,
    requestLine: String,
  ) {
    check(state == STATE_IDLE) { "state: $state" }
    socket.sink.writeUtf8(requestLine).writeUtf8("\r\n")
    for (i in 0 until headers.size) {
      socket.sink
        .writeUtf8(headers.name(i))
        .writeUtf8(": ")

When writing request headers, use `header(name, value)` to set the only occurrence of `name` to `value`. If there are existing values, they will be removed before the new value is added. Use `addHeader(name, value)` to add a header without removing the headers already present.

        .build()
    get(redirectSourceUrl)
    val request = redirectSource.takeRequest()
    assertThat(request.headers["Cookie"]).isEqualTo("c=cookie")
    for (header in redirectTarget.takeRequest().headers.names()) {
      if (header.startsWith("Cookie")) {
        fail(header)
      }
    }
  }

  @Test
  fun testCookiesSentIgnoresCase() {
    client =
      client
        .newBuilder()

        }
      }

      // There's another part. Parse its headers and return it.
      val headers = HeadersReader(source).readHeaders()
      val partSource = PartSource()
      currentPart = partSource
      return Part(headers, partSource.buffer())
    }

    /** A single part in the stream. It is an error to read this after calling [nextPart]. */