* See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.http2

import java.io.IOException
import java.net.ProtocolException
import java.util.Locale
import java.util.concurrent.TimeUnit
import okhttp3.Headers
import okhttp3.OkHttpClient
import okhttp3.Protocol
import okhttp3.Request
import okhttp3.Response
import okhttp3.internal.headersContentLength

 * limitations under the License.
 */
package okhttp3

import java.nio.charset.Charset
import java.util.Collections.singletonMap
import java.util.Collections.unmodifiableMap
import java.util.Locale.US
import kotlin.text.Charsets.ISO_8859_1
import okhttp3.internal.commonEquals
import okhttp3.internal.commonHashCode
import okhttp3.internal.commonToString

/**
 * An [RFC 7235][rfc_7235] challenge.
 *