from aiohttp import web async def stream_file(request): chunk_size = 4096 file_path = '/path/to/large/file' async with aiofiles.open(file_path, 'rb') as f: resp = web.StreamResponse() resp.content_type = 'application/octet-stream' await resp.prepare(request) async for chunk in f.iter_chunked(chunk_size): await resp.write(chunk) await resp.drain() return resp
async def stream_data(request): data = b'Hello, world!' resp = web.StreamResponse() resp.headers['x-custom-header'] = 'foo' await resp.prepare(request) await resp.write(data) return respIn this example, we create a `StreamResponse` object, set a custom header with the `headers` attribute, call `StreamResponse.prepare()`, write some data, and return the response. Overall, `StreamResponse.prepare()` is a key method in the aiohttp web framework that is used to prepare a response for streaming data to the client. It is related to aiohttp's StreamResponse object and is part of the aiohttp package library.