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  2. github.com/tiangolo/fastapi

    docs/zh-hant/docs/advanced/custom-response.md 

    簡而言之，若你想要最佳效能，請使用[回應模型](../tutorial/response-model.md)，並且不要在「路徑操作裝飾器」中宣告 `response_class`。

{* ../../docs_src/response_model/tutorial001_01_py310.py ln[15:17] hl[16] *}

## HTML 回應 { #html-response }

要直接從 **FastAPI** 回傳 HTML，使用 `HTMLResponse`。

- 匯入 `HTMLResponse`。
- 在「路徑操作裝飾器」中，將 `HTMLResponse` 傳給 `response_class` 參數。

{* ../../docs_src/custom_response/tutorial002_py310.py hl[2,7] *}

/// info
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Fri Mar 20 17:05:38 GMT 2026
    - 10.3K bytes
    - Click Count (0)
  3. github.com/tiangolo/fastapi

    tests/test_dump_json_fast_path.py 

    @app.get("/default")
def get_default() -> Item:
    return Item(name="widget", price=9.99)


@app.get("/explicit", response_class=JSONResponse)
def get_explicit() -> Item:
    return Item(name="widget", price=9.99)


client = TestClient(app)


def test_default_response_class_skips_json_dumps():
    """When no response_class is set, the fast path serializes directly to
    JSON bytes via Pydantic's dump_json and never calls json.dumps."""
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Sun Feb 22 16:07:19 GMT 2026
    - 1.4K bytes
    - Click Count (0)
  4. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial001b_py310.py 

    from fastapi import FastAPI
from fastapi.responses import ORJSONResponse

app = FastAPI()


@app.get("/items/", response_class=ORJSONResponse)
async def read_items():
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Thu Feb 12 13:19:43 GMT 2026
    - 215 bytes
    - Click Count (0)
  5. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial006c_py310.py 

    from fastapi import FastAPI
from fastapi.responses import RedirectResponse

app = FastAPI()


@app.get("/pydantic", response_class=RedirectResponse, status_code=302)
async def redirect_pydantic():
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Thu Feb 12 13:19:43 GMT 2026
    - 237 bytes
    - Click Count (0)
  6. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial002_py310.py 

    from fastapi import FastAPI
from fastapi.responses import HTMLResponse

app = FastAPI()


@app.get("/items/", response_class=HTMLResponse)
async def read_items():
    return """
    <html>
        <head>
            <title>Some HTML in here</title>
        </head>
        <body>
            <h1>Look ma! HTML!</h1>
        </body>
    </html>
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Thu Feb 12 13:19:43 GMT 2026
    - 352 bytes
    - Click Count (0)
  7. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial009b_py310.py 

    from fastapi import FastAPI
from fastapi.responses import FileResponse

some_file_path = "large-video-file.mp4"
app = FastAPI()


@app.get("/", response_class=FileResponse)
async def main():
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Thu Feb 12 13:19:43 GMT 2026
    - 217 bytes
    - Click Count (0)
  8. github.com/tiangolo/fastapi

    docs_src/server_sent_events/tutorial002_py310.py 

        name: str
    price: float


items = [
    Item(name="Plumbus", price=32.99),
    Item(name="Portal Gun", price=999.99),
    Item(name="Meeseeks Box", price=49.99),
]


@app.get("/items/stream", response_class=EventSourceResponse)
async def stream_items() -> AsyncIterable[ServerSentEvent]:
    yield ServerSentEvent(comment="stream of item updates")
    for i, item in enumerate(items):
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Sun Mar 01 09:21:52 GMT 2026
    - 686 bytes
    - Click Count (0)
  9. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial005_py310.py 

    from fastapi import FastAPI
from fastapi.responses import PlainTextResponse

app = FastAPI()


@app.get("/", response_class=PlainTextResponse)
async def main():
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Thu Feb 12 13:19:43 GMT 2026
    - 186 bytes
    - Click Count (0)
  10. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial004_py310.py 

            </head>
        <body>
            <h1>Look ma! HTML!</h1>
        </body>
    </html>
    """
    return HTMLResponse(content=html_content, status_code=200)


@app.get("/items/", response_class=HTMLResponse)
async def read_items():
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Thu Feb 12 13:19:43 GMT 2026
    - 491 bytes
    - Click Count (0)
  11. github.com/tiangolo/fastapi

    fastapi/sse.py 

            "retry": {"type": "integer", "minimum": 0},
    },
}


class EventSourceResponse(StreamingResponse):
    """Streaming response with `text/event-stream` media type.

    Use as `response_class=EventSourceResponse` on a *path operation* that uses `yield`
    to enable Server Sent Events (SSE) responses.

    Works with **any HTTP method** (`GET`, `POST`, etc.), which makes it compatible
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Sun Mar 01 09:21:52 GMT 2026
    - 6.2K bytes
    - Click Count (0)
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