# Tutorial - User Guide { #tutorial-user-guide }

This tutorial shows you how to use **FastAPI** with most of its features, step by step.

Each section gradually builds on the previous ones, but it's structured to separate topics, so that you can go directly to any specific one to solve your specific API needs.

It is also built to work as a future reference so you can come back and see exactly what you need.

## Run the code { #run-the-code }

@GwtIncompatible
abstract class Striped64 extends Number {
  /*
   * This class maintains a lazily-initialized table of atomically
   * updated variables, plus an extra "base" field. The table size
   * is a power of two. Indexing uses masked per-thread hash codes.
   * Nearly all declarations in this class are package-private,
   * accessed directly by subclasses.
   *
   * Table entries are of class Cell; a variant of AtomicLong padded

are working with. When loading untrusted checkpoints, the values of the traced
variables from your model are also going to be untrusted. That means that if
your code interacts with the filesystem, network, etc. and uses checkpointed
variables as part of those interactions (ex: using a string variable to build a
filesystem path), a maliciously created checkpoint might be able to change the
targets of those operations, which could result in arbitrary

**FastAPI** will keep the additional information from `responses`, and combine it with the JSON Schema from your model.

For example, you can declare a response with a status code `404` that uses a Pydantic model and has a custom `description`.

And a response with a status code `200` that uses your `response_model`, but includes a custom `example`:

{* ../../docs_src/additional_responses/tutorial003_py310.py hl[20:31] *}

        #    e.g. Synonym of Oracle --> list:{TABLE ; VIEW ; SYNONYM}
        #  This is only for the main schema. Additional schemas are unconcerned.
        #  However ReplaceSchema and Sql2Entity task also uses this.
        #  But you can set ReplaceSchema-original setting in its own dfprop.
        #
        #; objectTypeTargetList = list:{TABLE ; VIEW}

        # o tableExceptList: (NotRequired - Default list:{})

# Advanced Security { #advanced-security }

## Additional Features { #additional-features }

There are some extra features to handle security apart from the ones covered in the [Tutorial - User Guide: Security](../../tutorial/security/index.md).

/// tip

The next sections are **not necessarily "advanced"**.

And it's possible that for your use case, the solution is in one of them.

///

## Read the Tutorial first { #read-the-tutorial-first }

import okhttp3.internal.okHttpName
import okhttp3.internal.threadFactory

/**
 * A set of worker threads that are shared among a set of task queues.
 *
 * Use [INSTANCE] for a task runner that uses daemon threads. There is not currently a shared
 * instance for non-daemon threads.
 *
 * The task runner is also responsible for releasing held threads when the library is unloaded.

Voici ce à garder à l'esprit et comment relire une pull request :

### Comprendre le problème { #understand-the-problem }

* D'abord, assurez‑vous de **comprendre le problème** que la pull request essaie de résoudre. Il peut y avoir une discussion plus longue dans une GitHub Discussion ou une issue.

- [PRF](#prf): HMAC-SHA-256
- [AEAD](#aead): AES-256-GCM if the CPU supports AES-NI, ChaCha20-Poly1305 otherwise. More specifically AES-256-GCM is only selected for X86-64 CPUs with AES-NI extension.

     */
    void attachArtifact(@Nonnull Project project, @Nonnull ProducedArtifact artifact, @Nonnull Path path);

    /**
     * {@return all source root directories}, including the disabled ones, for all languages and scopes.
     * For listing only the {@linkplain SourceRoot#enabled() enabled} source roots,
     * the following code can be used:
     *
     * <pre>{@literal