.build()
    val buffer = Buffer()
    body.writeTo(buffer)
    buffer.skip(3) // Skip "a=b" prefix.
    return buffer.readUtf8(buffer.size - 1) // Skip the "c" suffix.
  }

  @Test
  fun manualCharset() {
    val body =
      FormBody
        .Builder(StandardCharsets.ISO_8859_1)
        .add("name", "Nicolás")
        .build()
    val expected = "name=Nicol%E1s"