* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
@file:JvmName("HttpHeaders")

package okhttp3.internal.http

import java.io.EOFException
import java.net.HttpURLConnection.HTTP_NOT_MODIFIED
import java.net.HttpURLConnection.HTTP_NO_CONTENT
import java.util.Collections

 *   <li><a href="http://www.ietf.org/rfc/rfc5988.txt">RFC 5988</a>
 * </ul>
 *
 * @author Kurt Alfred Kluever
 * @since 11.0
 */
@GwtCompatible
public final class HttpHeaders {
  private HttpHeaders() {}

  // HTTP Request and Response header fields

  /** The HTTP {@code Cache-Control} header field name. */
  public static final String CACHE_CONTROL = "Cache-Control";

    ImmutableList.Builder<String> httpHeaders = ImmutableList.builder();
    for (Field field : httpHeadersFields()) {
      httpHeaders.add((String) field.get(null));
    }
    assertThat(httpHeaders.build()).containsNoDuplicates();
  }

  private static ImmutableSet<Field> httpHeadersFields() {
    ImmutableSet.Builder<Field> builder = ImmutableSet.builder();
    for (Field field : HttpHeaders.class.getDeclaredFields()) {
      /*

                Integer connectTimeout = null;
                Integer requestTimeout = null;

                PlexusConfiguration httpHeaders = config.getChild("httpHeaders", false);
                if (httpHeaders != null) {
                    PlexusConfiguration[] properties = httpHeaders.getChildren("property");
                    if (properties != null && properties.length > 0) {
                        headers = new HashMap<>();

          httpHeaders.add(name, value)
        } else {
          throw IllegalStateException()
        }
        if (name == "expect" && value.equals("100-continue", ignoreCase = true)) {
          // Don't read the body unless we've invited the client to send it.
          readBody = false
        }
      }
      val headers = httpHeaders.build()

      val peek = dispatcher.peek()

HSPLokhttp3/internal/http/CallServerInterceptor;->intercept(Lokhttp3/Interceptor$Chain;)Lokhttp3/Response;
HSPLokhttp3/internal/http/HttpHeaders;-><clinit>()V
HSPLokhttp3/internal/http/HttpHeaders;->promisesBody(Lokhttp3/Response;)Z
HSPLokhttp3/internal/http/HttpHeaders;->receiveHeaders(Lokhttp3/CookieJar;Lokhttp3/HttpUrl;Lokhttp3/Headers;)V
HSPLokhttp3/internal/http/HttpMethod;->permitsRequestBody(Ljava/lang/String;)Z

_2019-07-10_

 *  Fix: Tolerate null-hostile lists in public API. Lists created with `List.of(...)` don't like it
    when you call `contains(null)` on them!
 *  Fix: Retain binary-compatibility in `okhttp3.internal.HttpHeaders.hasBody()`. Some unscrupulous
    coders call this and we don't want their users to suffer.


## Version 4.0.0

_2019-06-26_