is not available, instead of erroring out, the dependency result will
                be `None`.

                This is useful when you want to have optional authentication.

                It is also useful when you want to have authentication that can be
                provided in one of multiple optional ways (for example, with OAuth2
                or in a cookie).
                """

# Development - Contributing

First, you might want to see the basic ways to [help FastAPI and get help](help-fastapi.md).

## Developing

If you already cloned the [fastapi repository](https://github.com/fastapi/fastapi) and you want to deep dive in the code, here are some guidelines to set up your environment.

### Install requirements

Create a virtual environment and install the required packages with [`uv`](https://github.com/astral-sh/uv):

labels.wizard_button_finish=Skip
labels.search_list_configuration=Search
labels.search_list_button_delete=Delete
labels.search_list_delete_confirmation=Are you sure you want to delete?
labels.search_list_button_delete_all=Delete All by this Query
labels.search_list_delete_all_confirmation=Are you sure you want to delete all by this query?
labels.search_list_button_cancel=Cancel
labels.failure_url_configuration=Failure URL
labels.failure_url_search_url=URL

labels.wizard_button_finish=Skip
labels.search_list_configuration=Search
labels.search_list_button_delete=Delete
labels.search_list_delete_confirmation=Are you sure you want to delete?
labels.search_list_button_delete_all=Delete All by this Query
labels.search_list_delete_all_confirmation=Are you sure you want to delete all by this query?
labels.search_list_button_cancel=Cancel
labels.failure_url_configuration=Failure URL
labels.failure_url_search_url=URL

        with:
          results_file: results.sarif
          results_format: sarif
          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
          # - you want to enable the Branch-Protection check on a *public* repository, or
          # - you are installing Scorecard on a *private* repository

# Vibe Coding { #vibe-coding }

Are you tired of all that **data validation**, **documentation**, **serialization**, and all that **boring** stuff?

Do you just want to **vibe**? 🎶

**FastAPI** now supports a new `@app.vibe()` decorator that embraces **modern AI coding best practices**. 🤖

## How It Works { #how-it-works }

   *
   * @param input the input bytes
   * @param offset the offset into the array at which to start
   * @return a long of a concatenated 8 bytes
   */
  static long load64(byte[] input, int offset) {
    // We don't want this in production code as this is the most critical part of the loop.
    assert input.length >= offset + 8;
    // Delegates to the fast (unsafe) version or the fallback.
    return byteArray.getLongLittleEndian(input, offset);

            text(
                "performance.baselines",
                "",
                display = ParameterDisplay.PROMPT,
                allowEmpty = true,
                description = "The baselines you want to run performance tests against. Empty means default baseline.",
            )
            text(
                "testProject",
                "",
                display = ParameterDisplay.PROMPT,

* A PR should have a specific use case that it is solving.

* If the PR is for a feature, it should have docs.
    * Unless it's a feature we want to discourage, like support for a corner case that we don't want users to use.
* The docs should include a source example file, not write Python directly in Markdown.

name: Contributor CI Build

on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master

concurrency:
  # On master/release, we don't want any jobs cancelled so the sha is used to name the group
  group: ${{ (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/release' ) && format('contributor-pr-base-{0}', github.sha) || format('contributor-pr-{0}', github.ref) }}
  cancel-in-progress: false

env: