This is similar to the 200 HTTP status codes (from 200 to 299). Those "200" status codes mean that somehow there was a "success" in the request.

The status codes in the 400 range mean that there was an error from the client.

Remember all those **"404 Not Found"** errors (and jokes)?

## Use `HTTPException` { #use-httpexception }

 * default} methods. Instead, it inherits their default implementations. When those implementations
 * invoke methods, they invoke methods on the {@code ForwardingMap}.
 *
 * <p>Each of the {@code standard} methods, where appropriate, use {@link Objects#equals} to test
 * equality for both keys and values. This may not be the desired behavior for map implementations

     * @param done true if this is the final chunk
     */
    void onChunk(String content, boolean done);

    /**
     * Called when an error occurs during processing.
     *
     * @param phase the phase where the error occurred
     * @param error the error message
     */
    void onError(String phase, String error);

    /**
     * Returns a no-op callback implementation.
     *

Because of this, **FastAPI** itself provides an alternative API documentation (using ReDoc), which you can access at [http://127.0.0.1:8000/redoc](http://127.0.0.1:8000/redoc):

<img src="/img/tutorial/path-params/image02.png">

The same way, there are many compatible tools. Including code generation tools for many languages.

        project.getPluginManager().apply(RestTestBasePlugin.class);
        var extension = project.getExtensions().getByType(PluginPropertiesExtension.class);

        // We've ported this from multiple build scripts where we see this pattern into
        // an extension method as a first step of consolidation.
        // We might want to port this into a general pattern later on.
        project.getExtensions()
            .getExtraProperties()

## Status

- ACCEPTED on 2025-11-24

## Context

Gradle is an international open-source project with contributors from around the world. English is the primary language for code, comments, documentation, and communication, but there are variations in English spelling and terminology, specifically American English vs. British English.

Inconsistency in spelling conventions can lead to several issues:

# Extending OpenAPI { #extending-openapi }

There are some cases where you might need to modify the generated OpenAPI schema.

In this section you will see how.

## The normal process { #the-normal-process }

The normal (default) process, is as follows.

A `FastAPI` application (instance) has an `.openapi()` method that is expected to return the OpenAPI schema.

  }

  @GwtIncompatible
  @J2ktIncompatible
  @Override
  public void refresh(K key) {
    delegate().refresh(key);
  }

  /**
   * A simplified version of {@link ForwardingLoadingCache} where subclasses can pass in an already
   * constructed {@link LoadingCache} as the delegate.
   *
   * @since 10.0
   */
  public abstract static class SimpleForwardingLoadingCache<K, V>

    delegate().addListener(listener, exec);
  }

  // TODO(cpovirk): Use standard Javadoc form for SimpleForwarding* class and constructor
  /**
   * A simplified version of {@link ForwardingListenableFuture} where subclasses can pass in an
   * already constructed {@link ListenableFuture} as the delegate.
   *
   * @since 9.0
   */
  public abstract static class SimpleForwardingListenableFuture<V extends @Nullable Object>

     */
    public ModelBuilderException(ModelBuilderResult result) {
        super(result.toString());
        this.result = result;
    }

    /**
     * Gets the interim result of the model building up to the point where it failed.
     *
     * @return The interim model building result or {@code null} if not available.
     */
    public ModelBuilderResult getResult() {
        return result;
    }

    /**