You can use any template engine you want with **FastAPI**.

A common choice is Jinja2, the same one used by Flask and other tools.

There are utilities to configure it easily that you can use directly in your **FastAPI** application (provided by Starlette).

## Install dependencies { #install-dependencies }

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and install `jinja2`:

     * Gets the pointer/offset to the string data.
     *
     * @return the pointer to the string data
     */
    public int getPointer() {
        return this.pointer;
    }

    /**
     * Validates the provided string against this structure's metadata.
     * Checks that the string length matches the expected length and that
     * null strings have a zero pointer.
     *
     * @param string the string to validate

![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/node/grafana-node.png)

    return new SingletonImmutableTable<>(rowKey, columnKey, value);
  }

  /**
   * Returns an immutable copy of the provided table.
   *
   * <p>The {@link Table#cellSet()} iteration order of the provided table determines the iteration
   * ordering of all views in the returned table. Note that some views of the original table and the

    protected FailureUrlBhv failureUrlBhv;

    /** Configuration settings for Fess */
    @Resource
    protected FessConfig fessConfig;

    /**
     * Retrieves a paginated list of failure URLs based on the provided pager criteria.
     *
     * @param failureUrlPager the pager containing search criteria and pagination settings
     * @return a list of FailureUrl entities matching the criteria
     */

    public void test_constructor_withTypeAndMessage() {
        // Test constructor with type and message
        String type = "Bearer";
        String message = "Invalid access token provided";
        InvalidAccessTokenException exception = new InvalidAccessTokenException(type, message);

        assertEquals(type, exception.getType());
        assertEquals(message, exception.getMessage());

 * behavior of {@link #addAll}, which can lead to unexpected behavior. In this case, you should
 * override {@code addAll} as well, either providing your own implementation, or delegating to the
 * provided {@code standardAddAll} method.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations

 * server. Rather than represent each with it's own <code>Exception</code>
 * class, this class represents all of them. For many of the popular
 * error codes, constants and text messages like "The device is not ready"
 * are provided.
 * <p>
 * The jCIFS client maps DOS error codes to NTSTATUS codes. This means that
 * the user may recieve a different error from a legacy server than that of

     * Initializes the service with dependency injection.
     */
    public RequestHeaderService() {
        // Default constructor
    }

    /**
     * Retrieves a paginated list of request headers based on the provided pager criteria.
     *
     * @param requestHeaderPager the pager containing pagination and search criteria
     * @return a list of request headers matching the specified criteria
     */

    return join(iterable(first, second, rest));
  }

  /**
   * Returns a joiner with the same behavior as this one, except automatically substituting {@code
   * nullText} for any provided null elements.
   */
  public Joiner useForNull(String nullText) {
    checkNotNull(nullText);
    return new Joiner(this) {
      @Override
      CharSequence toString(@Nullable Object part) {