if (layout.containsKey(key)) {
            if (layout.get(key).getValueLines() != null) {
                return new ArrayList<String>(layout.get(key).getValueLines());
            }
        }
        List<String> result = new ArrayList<String>();
        if (storage.containsKey(key)) {
            result.add(storage.get(key));
        }
        return result;
    }

        if (layout.containsKey(key)) {
            if (layout.get(key).getValueLines() != null) {
                return new ArrayList<String>(layout.get(key).getValueLines());
            }
        }
        List<String> result = new ArrayList<String>();
        if (storage.containsKey(key)) {
            result.add(storage.get(key));
        }
        return result;
    }

* `expose_headers` - Indicate any response headers that should be made accessible to the browser. Defaults to `[]`.
* `max_age` - Sets a maximum time in seconds for browsers to cache CORS responses. Defaults to `600`.

The middleware responds to two particular types of HTTP request...

### CORS preflight requests { #cors-preflight-requests }

                lifecycle.allPhases().forEach(phase -> phase.phases().forEach(child -> {
                    steps.get(BEFORE + child.name()).executeAfter(steps.get(BEFORE + phase.name()));
                    steps.get(AFTER + phase.name()).executeAfter(steps.get(AFTER + child.name()));
                }));
                // for each phase, create links between this project phases

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.common.primitives.Ints;
import com.google.common.testing.EqualsTester;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.util.Arrays;

    ImmutableSortedSet<Integer> set = ContiguousSet.create(Range.closed(1, 3), integers());
    for (Set<Integer> subset : Sets.powerSet(ImmutableSet.of(1, 2, 3))) {
      assertTrue(set.containsAll(subset));
    }
    for (Set<Integer> subset : Sets.powerSet(ImmutableSet.of(1, 2, 3))) {
      assertFalse(set.containsAll(Sets.union(subset, ImmutableSet.of(9))));
    }
  }

      apply {
        this.message = message
      }

    open fun handshake(handshake: Handshake?) =
      apply {
        this.handshake = handshake
      }

    /**
     * Sets the header named [name] to [value]. If this request already has any headers
     * with that name, they are all replaced.
     */
    open fun header(
      name: String,
      value: String,
    ) = apply {

        if (!sizeIfKnown.isPresent()) {
          return Optional.absent();
        }
        result += sizeIfKnown.get();
        if (result < 0) {
          // Overflow (or one or more sources that returned a negative size, but all bets are off in
          // that case)
          // Can't represent anything higher, and realistically there probably isn't anything that

   * </ul>
   *
   * <p>The result is guaranteed to be in the "traditional", lexicographical order for Cartesian
   * products that you would get from nesting for loops:
   *
   * {@snippet :
   * for (B b0 : lists.get(0)) {
   *   for (B b1 : lists.get(1)) {
   *     ...
   *     ImmutableList<B> tuple = ImmutableList.of(b0, b1, ...);
   *     // operate on tuple
   *   }
   * }
   * }
   *

		uploadID          string // uploadID of the transaction.
		invalidPartNumber bool   // Sets an invalid multipart.
		maximumPartNumber bool   // Sets a maximum parts.
		accessKey         string
		secretKey         string
		// expected output.
		expectedRespStatus int
	}{