if (pos > 0) {
                return value.substring(0, pos);
            }
            if (pos == -1) {
                return value;
            }
            return "localhost";
        }
        if (url.startsWith("file:")) {
            return "localhost";
        }

        return getHost(url);
    }

    /**
     * Get the role types.

                        return false;
                    }
                    if (Arrays.stream(webProtocols).anyMatch(p -> s.startsWith(p))) {
                        return web;
                    }
                    if (Arrays.stream(fileProtocols).anyMatch(p -> s.startsWith(p))) {
                        return file;
                    }
                    return true;

            return parent.toArray();
        }

        public <T> T[] toArray(final T[] a) {
            return parent.toArray(a);
        }

        public boolean add(final E e) {
            return parent.add(e);
        }

        public boolean remove(final Object o) {
            return parent.remove(o);
        }

        public boolean containsAll(final Collection<?> c) {

    @Override
    public boolean hasNext() {
      return !nextElements.isEmpty();
    }

    @Override
    public boolean hasPrevious() {
      return !previousElements.isEmpty();
    }

    @Override
    public E next() {
      return transferElement(nextElements, previousElements);
    }

    @Override
    public int nextIndex() {
      return previousElements.size();
    }

    @Override

/*
 * Copyright (C) 2016 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

      }
      return builder.build();
    }
  }

  @J2ktIncompatible
  @AndroidIncompatible // test-suite builders
  public static class ImmutableListMultimapCopyOfEntriesGenerator
      extends TestStringListMultimapGenerator {
    @Override
    protected ListMultimap<String, String> create(Entry<String, String>[] entries) {
      return ImmutableListMultimap.copyOf(Arrays.asList(entries));
    }

                  });
    }

    @Override
    protected Multimap<K, V> delegate() {
      return unusableDelegate;
    }

    @Override
    public boolean put(K key, V value) {
      map.put(key, value);
      return true;
    }

    SetMultimap<K, V> build() {
      return Multimaps.forMap(map);
    }
  }

  abstract static class TestEntriesGenerator

            if (length > 0) {
              out.write(buffer, offset, 1);
              return false;
            } else {
              return true;
            }
          }

          @Override
          public byte[] getResult() {
            return out.toByteArray();
          }
        };

    File asciiFile = getTestFile("ascii.txt");

        copy.setStartInstant(original.getStartInstant());
        return copy;
    }

    @Override
    public String getBaseDirectory() {
        if (basedir == null) {
            return null;
        }

        return basedir.getAbsolutePath();
    }

    @Override
    public ArtifactRepository getLocalRepository() {
        return localRepository;
    }

    @Override

///

## データバリデーション

しかしブラウザで <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a> を開くと、次のHTTPエラーが表示されます:

```JSON
{
    "detail": [
        {
            "loc": [
                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]