How to capture downloaded content? The download GET response content is None

[changsin]

I am trying to capture the content of a download request/response but find that the content (the file content) is unavailable in the response.

I was following the suggestions from this thread:
#6103

    async def response(self, flow: http.HTTPFlow) -> None:
        if "Content-Disposition" in flow.response.headers:
            content_disposition = flow.response.headers["Content-Disposition"]
            filename_match = re.search('filename=\"(.*)\"', content_disposition)
            if filename_match:
                filename = filename_match.group(1)
                content = flow.response.get_content(strict=False)
                if content: <-- content is usually empty

I can capture the filename, but the response content is null, so I cannot capture the downloaded file.

Here is the version info:
Mitmproxy: 10.2.4
Python: 3.10.11
OpenSSL: OpenSSL 3.2.1 30 Jan 2024
Platform: macOS-14.4-arm64-arm-64bit

[changsin]

I found out the answer to my question so posting here for posterity.
It turned out that we were setting the response stream value to True.
Refer to https://docs.mitmproxy.org/stable/overview-features/#streaming for details

    def responseheaders(self, flow: http.HTTPFlow) -> None:
        """
        Enables streaming for all responses.
        This is equivalent to passing `--set stream_large_bodies=1` to mitmproxy.
        """
        flow.response.stream = True