```

=== "Python 3.8+"

    ```Python hl_lines="9"
    {!> ../../../docs_src/query_params_str_validations/tutorial002.py!}
    ```

  - help-fastapi.md
  - contributing.md
- release-notes.md
markdown_extensions:
  toc:
    permalink: true
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    guess_lang: false
  mdx_include:
    base_path: docs
  admonition: null
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* 100% <abbr title="The amount of code that is automatically tested">test coverage</abbr>.
* 100% <abbr title="Python type annotations, with this your editor and external tools can give you better support">type annotated</abbr> code base.
* Used in production applications.

## Starlette features

!!! info "📡 ℹ"
    **FastAPI** 🔜 💭 👈 ⚫️ 💪 ⚙️ 🎓 `OAuth2PasswordBearer` (📣 🔗) 🔬 💂‍♂ ⚖ 🗄 ↩️ ⚫️ 😖 ⚪️➡️ `fastapi.security.oauth2.OAuth2`, ❔ 🔄 😖 ⚪️➡️ `fastapi.security.base.SecurityBase`.

    🌐 💂‍♂ 🚙 👈 🛠️ ⏮️ 🗄 (& 🏧 🛠️ 🩺) 😖 ⚪️➡️ `SecurityBase`, 👈 ❔ **FastAPI** 💪 💭 ❔ 🛠️ 👫 🗄.

## ⚫️❔ ⚫️ 🔨

Sebastián Ramírez <******@****.***> 1544195536 +0400

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

SQLALCHEMY_DATABASE_URL = "sqlite:///./sql_app.db"
# SQLALCHEMY_DATABASE_URL = "postgresql://user:password@postgresserver/db"

engine = create_engine(
    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

def test_middleware():
    client = TestClient(app, base_url="http://example.com")
    response = client.get("/")
    assert response.status_code == 200, response.text
    client = TestClient(app, base_url="http://subdomain.example.com")
    response = client.get("/")
    assert response.status_code == 200, response.text
    client = TestClient(app, base_url="http://invalidhost")
    response = client.get("/")

from sqlalchemy.orm import relationship

from .database import Base


class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True)
    email = Column(String, unique=True, index=True)
    hashed_password = Column(String)
    is_active = Column(Boolean, default=True)

    items = relationship("Item", back_populates="owner")


class Item(Base):
    __tablename__ = "items"

In the next sections you will see other options, configurations, and additional features.

!!! 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

You could still use most of the features in **FastAPI** with the knowledge from the main [Tutorial - User Guide](../tutorial/index.md){.internal-link target=_blank}.

The contents that you return from your *path operation function* will be put inside of that `Response`.

And if that `Response` has a JSON media type (`application/json`), like is the case with the `JSONResponse` and `UJSONResponse`, the data you return will be automatically converted (and filtered) with any Pydantic `response_model` that you declared in the *path operation decorator*.

!!! note