import java.util.Comparator;
import java.util.EnumMap;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Properties;
import java.util.Set;

import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.ConcurrentModificationException;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.RandomAccess;
import java.util.Set;
import java.util.Vector;

        .build()
    assertThat(request.header("D")).isEqualTo("f")
    assertThat(request.header("d")).isEqualTo("f")
    val requestHeaders = request.headers
    assertThat(LinkedHashSet(requestHeaders.values("D"))).isEqualTo(newSet("e", "f"))
    assertThat(LinkedHashSet(requestHeaders.values("d"))).isEqualTo(newSet("e", "f"))
    val response = getResponse(request)
    response.close()
    val recordedRequest = server.takeRequest()

   */
  @get:JvmName("queryParameterNames")
  val queryParameterNames: Set<String>
    get() {
      if (queryNamesAndValues == null) return emptySet()
      val result = LinkedHashSet<String>(queryNamesAndValues.size / 2, 1.0F)
      for (i in 0 until queryNamesAndValues.size step 2) {
        result.add(queryNamesAndValues[i]!!)
      }
      return result.unmodifiable()
    }

  /**

import java.util.AbstractMap;
import java.util.AbstractQueue;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentLinkedQueue;

    cloned.enqueue(callback)
    val firstResponse = callback.await(request.url).assertSuccessful()
    val secondResponse = callback.await(request.url).assertSuccessful()
    val bodies: MutableSet<String?> = LinkedHashSet()
    bodies.add(firstResponse.body)
    bodies.add(secondResponse.body)
    assertThat(bodies).contains("abc")
    assertThat(bodies).contains("def")
  }

  @Test
  fun get_Async() {