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FastAPi error: Response content longer than Content-Length #82

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ajikmr opened this issue Dec 9, 2024 · 0 comments
Open

FastAPi error: Response content longer than Content-Length #82

ajikmr opened this issue Dec 9, 2024 · 0 comments
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bug Something isn't working

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@ajikmr
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ajikmr commented Dec 9, 2024 •
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Hi,

I have created a lambda API using Cloudformation. When I chat with a file attachment included, I get the following error.

_File "/usr/local/lib/python3.11/site-packages/starlette/middleware/errors.py", line 161, in send
await send(message)
File "/usr/local/lib/python3.11/site-packages/uvicorn/protocols/http/httptools_impl.py", line 528, in send
raise RuntimeError("Response content longer than Content-Length")
RuntimeError: Response content longer than Content-Length

Chats without attachment seems to be fine.

After some search I found this:

Best Practices for Setting Content-Length in FastAPI
Leverage Automatic Handling by FastAPI:

FastAPI automatically includes the Content-Length header for most responses, based on the response content size. This applies when using built-in response classes like JSONResponse, HTMLResponse, or custom responses with the Response class1.
Avoid manually setting the Content-Length unless absolutely necessary.

Use Appropriate Response Classes:
Use built-in response classes such as HTMLResponse, JSONResponse, or FileResponse to ensure that headers, including Content-Length, are handled correctly.

from fastapi import FastAPI
from fastapi.responses import HTMLResponse

app = FastAPI()

@app.get("/", response_class=HTMLResponse)
async def read_items():
    return "<html><body>Hello, World!</body></html>"

There is no such error when I call other API based AI services. So, it seems something needs to be fixed.
@ajikmr ajikmr added the bug Something isn't working label Dec 9, 2024
@ajikmr ajikmr changed the title FastAPi error: FastAPi error: Response content longer than Content-Length Dec 9, 2024
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@ajikmr