* @return the result of the toolchains building, never {@code null}
     * @throws ToolchainsBuilderException if the effective toolchains could not be built
     */
    ToolchainsBuilderResult build(ToolchainsBuilderRequest request);

    /**
     * Builds the effective toolchains for the specified toolchains sources.
     *

 * such custom interfaces directly; they are implemented only in subclasses. Therefore, forwarding
 * {@code equals} would break symmetry, as the forwarding object might consider itself equal to the
 * object being tested, but the reverse could not be true. This behavior is consistent with the
 * JDK's collection wrappers, such as {@link java.util.Collections#unmodifiableCollection}. Use an

import gradlebuild.docs.dsl.source.ExtractDslMetaDataTask;

/**
 * Generates DSL reference material using Docbook and some homegrown class parsing.
 *
 * TODO: It would be nice to replace the Docbook portion of this with Asciidoc so that it could be
 * generated in the same way as the user manual with cross-links between them.
 */
public class GradleDslReferencePlugin implements Plugin<Project> {
    @Override

   * and not contents.
   *
   * <p>This is useful for implementing {@link Object#hashCode()}. For example, in an object that
   * has three properties, {@code x}, {@code y}, and {@code z}, one could write:
   *
   * {@snippet :
   * public int hashCode() {
   *   return Objects.hashCode(getX(), getY(), getZ());
   * }
   * }
   *

            } catch (Exception e) {
                exceptions.add(e);
            }
        }
        if (!exceptions.isEmpty()) {
            InvokerException exception = new InvokerException("Could not cleanly shut down context pool");
            exceptions.forEach(exception::addSuppressed);
            throw exception;
        }
    }

    @Override

        String actualString = request.toString();

        assertTrue(actualString.startsWith(expectedStringPrefix));
        assertTrue(actualString.endsWith("]"));
        // Further verification could involve mocking super.toString() if needed
    }

     */
    public ModelBuilderResult getResult() {
        return result;
    }

    /**
     * Gets the identifier of the POM whose effective model could not be built. The general format of the identifier is
     * {@code <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the

   */
  // TODO(user): Evaluate whether it makes sense to always piggyback the computation of a
  // HashCode on an existing OutputStream, compared to creating a separate OutputStream that could
  // be (optionally) be combined with another if needed (with something like
  // MultiplexingOutputStream).
  public HashingOutputStream(HashFunction hashFunction, OutputStream out) {
    super(checkNotNull(out));

`OAuth2PasswordBearer` makes **FastAPI** know that it is a security scheme. So it is added that way to OpenAPI.

But `OAuth2PasswordRequestForm` is just a class dependency that you could have written yourself, or you could have declared `Form` parameters directly.

But as it's a common use case, it is provided by **FastAPI** directly, just to make it easier.

///

### Use the form data { #use-the-form-data }

It might also help avoid confusion for new developers that see an unused parameter in your code and could think it's unnecessary.

///

/// info

In this example we use invented custom headers `X-Key` and `X-Token`.

But in real cases, when implementing security, you would get more benefits from using the integrated [Security utilities (the next chapter)](../security/index.md).

///