![Interceptors Diagram](../assets/images/******@****.***)

### Application Interceptors

Interceptors are registered as either _application_ or _network_ interceptors. We'll use the `LoggingInterceptor` defined above to show the difference.

import static com.google.common.io.BaseEncoding.base16;
import static com.google.common.truth.Truth.assertThat;
import static java.nio.charset.StandardCharsets.US_ASCII;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableList;
import com.google.common.io.BaseEncoding;
import com.google.common.testing.ClassSanityTester;
import java.util.Arrays;
import junit.framework.TestCase;

import static com.google.common.math.StatsTesting.createPartitionedFilledPairedStatsAccumulator;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static org.junit.Assert.assertThrows;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.math.StatsTesting.ManyValues;
import java.util.Collections;

                            HttpServletResponse.SC_UNAUTHORIZED);
                });
            }

            // assert
            if (null == principal) {
                final String msg = "Principal was null.";
                if (logger.isDebugEnabled()) {
                    logger.debug(msg);
                }

import static com.google.common.graph.TestUtil.sanityCheckSet;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.TruthJUnit.assume;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableSet;
import java.util.HashSet;
import java.util.Set;
import org.jspecify.annotations.NullUnmarked;
import org.junit.After;
import org.junit.Before;

      try {
        iterator.remove();
        fail("Remove on unmodifiable iterator succeeded");
      } catch (UnsupportedOperationException expected) {
      }
    }
  }

  /**
   * Asserts that two iterators contain elements in tandem.
   *
   * <p>This test only works with iterators that iterate over a finite set.
   */
  public static void assertIteratorsInOrder(

    if (supportsIteratorRemove) {
      int initialSize = map.size();
      iterator.next();
      iterator.remove();
      assertEquals(initialSize - 1, map.size());
      // (We can't assert that the values collection no longer contains the
      // removed value, because the underlying map can have multiple mappings
      // to the same value.)
      assertInvariants(map);

      of any other Contributor, and only if You agree to indemnify,
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      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.

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   APPENDIX: How to apply the Apache License to your work.

      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.

import static com.google.common.collect.testing.SampleElements.Strings.BEFORE_FIRST_2;
import static java.lang.Math.max;
import static java.util.Arrays.asList;
import static java.util.Collections.sort;
import static junit.framework.Assert.assertEquals;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ContiguousSet;
import com.google.common.collect.DiscreteDomain;