### Top-level application { #top-level-application }

First, create the main, top-level, **FastAPI** application, and its *path operations*:

{* ../../docs_src/sub_applications/tutorial001.py hl[3, 6:8] *}

### Sub-application { #sub-application }

            .listener(this)
            .build()
        connection.start()
      } catch (e: IOException) {
        logger.log(Level.INFO, "Http2Server connection failure: $e")
        socket?.closeQuietly()
      } catch (e: Exception) {
        logger.log(Level.WARNING, "Http2Server unexpected failure", e)
        socket?.closeQuietly()
      }
    }
  }

  private fun doSsl(socket: Socket): SSLSocket {

    replaceWith = ReplaceWith(expression = "headers"),
    level = DeprecationLevel.ERROR,
  )
  fun getHeaders(): Headers = headers

  fun setHeaders(headers: Headers) = apply { this.headers = headers }

  @JvmName("-deprecated_getTrailers")
  @Deprecated(
    message = "moved to var",
    replaceWith = ReplaceWith(expression = "trailers"),
    level = DeprecationLevel.ERROR,
  )

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.testing;

import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link TestLogHandler}.
 *

import java.net.SocketException
import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.Executors
import java.util.concurrent.TimeUnit
import java.util.concurrent.atomic.AtomicInteger
import java.util.logging.Level
import java.util.logging.Logger
import okhttp3.TestUtil.threadFactory
import okhttp3.internal.and
import okhttp3.internal.closeQuietly
import okhttp3.internal.threadName
import okio.Buffer
import okio.BufferedSink

import jcifs.Encodable;
import jcifs.internal.util.SMBUtil;

/**
 * DFS (Distributed File System) referral request buffer encoder.
 * Creates encoded request buffers for DFS referral requests, specifying the maximum
 * referral level and target path for which DFS resolution is requested.
 *
 * @author mbechler
 */
public class DfsReferralRequestBuffer implements Encodable {

    private final int maxReferralLevel;
    private final String path;

 * limitations under the License.
 */
package okhttp3.internal.concurrent

import java.util.logging.Level
import java.util.logging.Logger

internal inline fun Logger.taskLog(
  task: Task,
  queue: TaskQueue,
  messageBlock: () -> String,
) {
  if (isLoggable(Level.FINE)) {
    log(task, queue, messageBlock())
  }
}

internal inline fun <T> Logger.logElapsed(
  task: Task,

            final int n = NEGOTIATE_REQUEST.encode(sbuf, 4);
            Encdec.enc_uint32be(n & 0xFFFF, sbuf, 0); /* 4 byte ssn msg header */

            if (LogStream.level >= 4) {
                log.println(NEGOTIATE_REQUEST);
                if (LogStream.level >= 6) {
                    Hexdump.hexdump(log, sbuf, 4, n);
                }
            }

            out.write(sbuf, 0, 4 + n);
            out.flush();

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.File;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.codelibs.curl.Curl.Method;
import org.junit.Test;

public class CurlTest {
    private static final Logger logger = Logger.getLogger(CurlTest.class.getName());

    protected ThreadDumpUtil() {
        // noop
    }

    /**
     * Prints thread dump information to the logger at INFO level.
     */
    public static void printThreadDump() {
        processThreadDump(logger::info);
    }

    /**
     * Prints thread dump information to the logger at WARN level.
     */
    public static void printThreadDumpAsWarn() {
        processThreadDump(logger::warn);
    }

    /**