Node.js HTTP Function + Cloud Storage time out in emulator

[loucou]

[REQUIRED] Environment info

firebase-tools: 8.7.0

Platform: Windows

[REQUIRED] Test case

The function on the server:

module.exports = functions.region("europe-west3").https.onRequest((req, res) => {
    const bucket = admin.storage().bucket();
    const fileStream = bucket.file("test/launch.jpg").createReadStream();

    fileStream.on("data", chunk => res.write(chunk));
    fileStream.on("end", () => res.end());
    fileStream.on("response", r => {
        res.set({
            "content-type": r.headers["content-type"],
            "content-length": r.headers["content-length"],
            "content-disposition": "inline",
        });
    });

    res.on("close", () => res.status(200).send());
    res.on("error", () => res.status(500).send());
});

The client:

`

`

[REQUIRED] Steps to reproduce

Run the emulators, open the web page containing the img tag

[REQUIRED] Expected behavior

The function executes and finishes quickly

[REQUIRED] Actual behavior

The function executes fine and returns the image, but then it displays time out after 60s in the emulator logs. It only happens with emulators, not when run normally, and not when streaming a local file instead of a Cloud Storage file.

[samtstern]

@loucou thanks for the detailed repro!