builder.header("AZab09~", "AZab09 ~")
    builder.addHeader("AZab09~", "AZab09 ~")
  }

  @Test
  fun emptyNameForbidden() {
    val builder = Request.Builder()
    assertFailsWith<IllegalArgumentException> {
      builder.header("", "Value")
    }
    assertFailsWith<IllegalArgumentException> {
      builder.addHeader("", "Value")
    }
  }

  @Test

  }

  @Test
  fun receiveAndSendMultipleCookies() {
    server.enqueue(
      MockResponse
        .Builder()
        .addHeader("Set-Cookie", "a=android")
        .addHeader("Set-Cookie", "b=banana")
        .build(),
    )
    server.enqueue(MockResponse())
    val cookieManager = CookieManager(null, CookiePolicy.ACCEPT_ORIGINAL_SERVER)
    client =

    val request =
      Request
        .Builder()
        .url("https://api.github.com/repos/square/okhttp/issues")
        .header("User-Agent", "OkHttp Headers.java")
        .addHeader("Accept", "application/json; q=0.5")
        .addHeader("Accept", "application/vnd.github.v3+json")
        .build()

    client.newCall(request).execute().use { response ->
      if (!response.isSuccessful) throw IOException("Unexpected code $response")

    enableTlsWithTunnel()
    server.enqueue(
      MockResponse
        .Builder()
        .inTunnel()
        .code(407)
        .addHeader("Proxy-Authenticate: Basic realm=\"localhost\"")
        .addHeader("Connection: close")
        .build(),
    )
    server.enqueue(
      MockResponse
        .Builder()
        .inTunnel()
        .build(),
    )

        .Builder()
        .clearHeaders()
        .addHeader("Cookie: s=square")
        .addHeader("Cookie", "a=android")
    assertThat(headersToList(builder)).containsExactly("Cookie: s=square", "Cookie: a=android")
  }

  @Test
  fun mockResponseSetHeader() {
    val builder =
      MockResponse
        .Builder()
        .clearHeaders()
        .addHeader("Cookie: s=square")
        .addHeader("Cookie: a=android")

    Request request = new Request.Builder()
        .url("https://api.github.com/repos/square/okhttp/issues")
        .header("User-Agent", "OkHttp Headers.java")
        .addHeader("Accept", "application/json; q=0.5")
        .addHeader("Accept", "application/vnd.github.v3+json")
        .build();

    try (Response response = client.newCall(request).execute()) {

    var headers: Headers = mockResponse.headers
    var trailers: Headers = mockResponse.trailers
    mockResponse = mockResponse.clearHeaders()
    mockResponse = mockResponse.addHeader("")
    mockResponse = mockResponse.addHeader("", "")
    mockResponse = mockResponse.addHeaderLenient("", Any())
    mockResponse = mockResponse.setHeader("", Any())
    mockResponse.headers = headersOf()
    mockResponse.trailers = headersOf()

### Java
```java
MockResponse response = new MockResponse.Builder()
    .addHeader("Content-Type", "application/json; charset=utf-8")
    .addHeader("Cache-Control", "no-cache")
    .body("{}")
    .build();
```

### Kotlin
```kotlin
val response = MockResponse.Builder()
  .addHeader("Content-Type", "application/json; charset=utf-8")
  .addHeader("Cache-Control", "no-cache")
  .body("{}")
  .build()
```

        .Builder()
        .code(503)
        .addHeader("Connection", "Close")
        .addHeader("Retry-After", "0")
        .body("You took too long!")
        .onResponseEnd(ShutdownConnection)
        .build(),
    )
    server.enqueue(
      MockResponse
        .Builder()
        .code(503)
        .addHeader("Connection", "Close")
        .addHeader("Retry-After", "0")

     * by a colon and a value.
     */
    public fun addHeader(header: String): Builder =
      apply {
        headers_.add(header)
      }

    /**
     * Adds a new header with the name and value. This may be used to add multiple headers with the
     * same name.
     */
    public fun addHeader(
      name: String,
      value: Any,
    ): Builder =
      apply {