Fastapi File Streaming Response (HTML Video etc.)

file_streaming.py

import mimetypes
from pathlib import Path
import fastapi
import aiofiles 


router = fastapi.APIRouter()


@router.get('{path:path}')
async def streaming_endpoint(path: str, range: str = fastapi.Header()):
    chunk_size = 2 ** 20  # 1 MB
    
    disk_path = Path(path)
    if not disk_path.exists():
        raise fastapi.HTTPException(404, "not found")
   
    filesize = disk_path.stat().st_size
   
    typ, *ext = mimetypes.guess_type(disk_path.as_uri())
    if not typ:
        typ = "application/octet-stream"
    media_type = typ
    
    start, end = range.split('=')[-1].split('-')
   
    start = int(start)
    end = (
        int(end)
        if end
        else (start + chunk_size - 1)
    )
    size = end - start
    
    async with aiofiles.open(disk_path, mode='rb') as fh:
        await fh.seek(start)
        data = await fh.read(size + 1)
        headers = {
            'Content-Range': f'bytes {start}-{end}/{filesize}',
            'Accept-Ranges': 'bytes'
        }
        return fastapi.responses.Response(data, status_code=206, headers=headers, media_type=media_type)