*
   * @param multiset the multiset for which an unmodifiable view is to be generated
   * @return an unmodifiable view of the multiset
   */
  public static <E extends @Nullable Object> Multiset<E> unmodifiableMultiset(
      Multiset<? extends E> multiset) {
    if (multiset instanceof UnmodifiableMultiset || multiset instanceof ImmutableMultiset) {

	[net/http]                         # package link
	[#12345](/issue/12345)             # GitHub issues
	[CL 6789](/cl/6789)                # Gerrit changelists

To preview `next` content in merged form using a local instance of the website, run:

```
go run golang.org/x/website/cmd/golangorg@latest -goroot=..
```

     * Displays the search list management index page.
     *
     * @param form the list form for filtering
     * @return HTML response for the search list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final ListForm form) {
        saveToken();
        validate(form, messages -> {}, () -> asHtml(path_AdminError_AdminErrorJsp));
        return asListHtml();
    }

    /**

     * Displays the initial duplicate host management page.
     *
     * @param form the search form
     * @return HTML response for the duplicate host list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        return asListHtml();
    }

    /**
     * Displays the duplicate host list with pagination.
     *

     *
     * @param form the search form for filtering
     * @return HTML response for the request header list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        return asListHtml();
    }

    /**
     * Displays a paginated list of request header items.
     *

    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index() {
        return asListHtml();
    }

    /**
     * Displays the file authentication list with pagination.
     *
     * @param pageNumber the page number
     * @param form the search form
     * @return HTML response for the list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })

    /**
     * Displays the user management index page.
     *
     * @return HTML response for the user list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index() {
        return asListHtml();
    }

    /**
     * Displays a paginated list of users.
     *
     * @param pageNumber the page number to display (optional)

   * returned by {@link #row}. Those maps may support {@code setValue()}, {@code put()}, and {@code
   * putAll()}.
   *
   * @return a map view from each row key to a secondary map from column keys to values
   */
  Map<R, Map<C, V>> rowMap();

  /**
   * Returns a view that associates each column key with the corresponding map from row keys to

            protected OptionalThing<SMailSubjectFilter> createSubjectFilter() {
                return OptionalThing.of((view, subject) -> subject);
            }

            @Override
            protected OptionalThing<SMailAsyncStrategy> createAsyncStrategy() {
                return OptionalThing.of((view, runnable) -> async(asyncManager, runnable));
            }

            @Override

    /**
     * Displays the key match list page.
     *
     * @param form the search form
     * @return HTML response for the list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        return asListHtml();
    }

    /**
     * Displays the key match list with pagination.
     *
     * @param pageNumber the page number