* **WebSocket** support.
* In-process background tasks.
* Startup and shutdown events.
* Test client built on HTTPX.
* **CORS**, GZip, Static Files, Streaming responses.
* **Session and Cookie** support.
* 100% test coverage.
* 100% type annotated codebase.

## Pydantic features { #pydantic-features }

* <a href="https://github.com/fastapi/fastapi/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Aquestion+-label%3Aanswered+" class="external-link" target="_blank">📂 ❔</a>

📚 💼 👆 5️⃣📆 ⏪ 💭 ❔ 📚 ❔. 👶

🚥 👆 🤝 📚 👫👫 ⏮️ 👫 ❔, 👆 🔜 ▶️️ 🛂 [FastAPI 🕴](fastapi-people.md#_2){.internal-link target=_blank}. 👶

    /** The key of the message: by Filename (desc) */
    public static final String LABELS_search_result_sort_filename_desc = "{labels.search_result_sort_filename_desc}";

    /** The key of the message: by Date (asc) */
    public static final String LABELS_search_result_sort_created_asc = "{labels.search_result_sort_created_asc}";

    /** The key of the message: by Date (desc) */

   * example, thread A may be executing [responseBodyStart] while thread B executes [canceled].
   * Implementations must support such concurrent calls.
   *
   * Note that cancellation is best-effort and that a call may proceed normally after it has been
   * canceled. For example, happy-path events like [requestHeadersStart] and [requestHeadersEnd] may

        if (fieldSortBuilderList == null) {
            fieldSortBuilderList = new ArrayList<>();
        }
        fieldSortBuilderList.add(SortBuilders.fieldSort(field).order(ascOrDesc ? SortOrder.ASC : SortOrder.DESC));
    }

    // ===================================================================================
    //                                                                       Invalid Query

        if (fieldSortBuilderList == null) {
            fieldSortBuilderList = new ArrayList<>();
        }
        fieldSortBuilderList.add(SortBuilders.fieldSort(field).order(ascOrDesc ? SortOrder.ASC : SortOrder.DESC));
    }

    // ===================================================================================
    //                                                                       Invalid Query

     | or the command line, profiles have to have an ID that is unique.
     |
     | An encouraged best practice for profile identification is to use a consistent naming convention
     | for profiles, such as 'env-dev', 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc.
     | This will make it more intuitive to understand what the set of introduced profiles is attempting

		return "", "", s, ErrHeader
	}
	n -= int64(len(nStr) + 1) // convert from index in s to index in rest
	if n <= 0 {
		return "", "", s, ErrHeader
	}

	// Extract everything between the space and the final newline.
	rec, nl, rem := rest[:n-1], rest[n-1:n], rest[n:]
	if nl != "\n" {
		return "", "", s, ErrHeader
	}

	// The first equals separates the key from the value.

	cmd := adbCmd("exec-out", args)
	cmd.Stdout = filter
	// If the adb subprocess somehow hangs, go test will kill this wrapper
	// and wait for our os.Stderr (and os.Stdout) to close as a result.
	// However, if the os.Stderr (or os.Stdout) file descriptors are
	// passed on, the hanging adb subprocess will hold them open and
	// go test will hang forever.
	//
	// Avoid that by wrapping stderr, breaking the short circuit and

You can also use the *path operation decorator* parameters `response_model_include` and `response_model_exclude`.

They take a `set` of `str` with the name of the attributes to include (omitting the rest) or to exclude (including the rest).

This can be used as a quick shortcut if you have only one Pydantic model and want to remove some data from the output.

/// tip