)
async def read_item(item_id: str, img: Union[bool, None] = None):
    if img:
        return FileResponse("image.png", media_type="image/png")
    else:

            MavenProject project = session.getProjects().get(0);

            Dependency dependency = new Dependency();
            dependency.setArtifactId(INJECTED_ARTIFACT_ID);
            dependency.setGroupId("foo");
            dependency.setVersion("1.2.3");
            dependency.setScope("system");
            try {
                dependency.setSystemPath(new File(

            return true; // BAD!!
          }

          @Override
          public String get() {
            return "foo"; // BAD!!
          }

          @Override
          public String get(long time, TimeUnit unit) {
            return "foo"; // BAD!!
          }

          @Override
          public void addListener(Runnable runnable, Executor executor) {

Then, with a URL like:

```
http://localhost:8000/items/?q=foo&q=bar
```

you would receive the multiple `q` *query parameters'* values (`foo` and `bar`) in a Python `list` inside your *path operation function*, in the *function parameter* `q`.

So, the response to that URL would be:

```JSON
{
  "q": [
    "foo",
    "bar"
  ]
}
```

/// tip

from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel, Field

app = FastAPI()


class Item(BaseModel):
    name: str = Field(examples=["Foo"])
    description: Union[str, None] = Field(default=None, examples=["A very nice Item"])
    price: float = Field(examples=[35.4])
    tax: Union[float, None] = Field(default=None, examples=[3.2])


@app.put("/items/{item_id}")

                // foo(String, Object) vs. foo(Object, String))
                return INCOMPARABLE;
            }

            return MORE_SPECIFIC;
        }

        if (c2MoreSpecific) {
            return LESS_SPECIFIC;
        }

        // Incomparable due to non-related arguments (i.e.
        // foo(Runnable) vs. foo(Serializable))
        return INCOMPARABLE;
    }

from fastapi import FastAPI
from pydantic import BaseModel, Field

app = FastAPI()


class Item(BaseModel):
    name: str = Field(examples=["Foo"])
    description: str | None = Field(default=None, examples=["A very nice Item"])
    price: float = Field(examples=[35.4])
    tax: float | None = Field(default=None, examples=[3.2])


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item):

        min_length=3,
        max_length=50,
        pattern="^fixedquery$",
        deprecated=True,
    ),
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

from fastapi.testclient import TestClient

from docs_src.response_change_status_code.tutorial001_py39 import app

client = TestClient(app)


def test_path_operation():
    response = client.put("/get-or-create-task/foo")
    print(response.content)
    assert response.status_code == 200, response.text
    assert response.json() == "Listen to the Bar Fighters"
    response = client.put("/get-or-create-task/bar")

foo iRFmWghs3CK9/2HSvRja4TzX8HsRwzbVY+h0HRkH9uPho2BGmrG5a0/+rkLSA3GUOX/WiPmP+h73T1r0DZIDJXtOgYWIU/y2H+WAe/ZlWt90N2KHka0bkXajoE/3mu7jiCW45hTNBDp3ArJ+K8Oh6bEfN2bHhXjZ41Zk+uvksVba2ZNyhThAAGZgi/pRa/oCT4HUoBWcY3w96+TGR6uXtvbDOM9WhPXGo+1bwhAsA/RXPA1ZX+oS6t4rl/ZvkMZZN4VO5OvKph8tth/BGEK6mw4oTRa1Hd91+bUUqQh6hl3JeDk/t2KDWOEehOxgOqfVG72U/pUXrcUXuywq9KT+bWQxdJsXzwkkyT8Ovz4o/Ib8Xxz+BHwpN3TtOXsHziuqLGMz+OxetaxhQqe1G/UWwfi5a9PuJC3wfITSa0=...