When should I use Download file via Playwright instead of Download file as string?

Use Playwright when the target URL requires JavaScript to render, is behind a login or bot-detection wall, or requires a proxy. For plain, static, and publicly accessible files, Download file as string is faster and simpler.

What happens if a file exceeds the 10 MB limit in Download file as string?

The step fails with an error. For larger files, use a connector that handles large file transfers natively, or download to storage using Create UnifyApps file from url instead.

Does Send Mqtt Request wait for a reply from the broker?

No. It publishes the message and completes immediately. Use a separate MQTT trigger or subscriber node if you need to receive a response or confirmation.

The Download & Network operations in the Utility node fetch files and data over the network — downloading a file's content as a string, using a headless browser to retrieve bot-protected or JavaScript-gated resources, downloading multiple files in bulk from a list of URLs, and publishing messages to an MQTT broker topic.

Overview

Four operations cover network-based retrieval and messaging: a fast HTTP file-to-string download for plain accessible files, a browser-rendered download for pages that require JavaScript or bypass bot detection, bulk file fetching from a list of URLs, and fire-and-forget publishing to an MQTT broker. Pick the download method that matches the target — plain HTTP for simple files, Playwright for anything that needs a real browser.

Operations

Operation	What it does
Download file as string	Downloads the content of a file at a URL and returns it as a text or base64 string. Capped at approximately 10 MB — files larger than this limit will cause the step to fail.
Download file via Playwright	Fetches a URL using a headless browser (Playwright). Executes JavaScript, can route through a proxy, and handles bot-protected or JS-gated downloads that a plain HTTP fetch cannot reach. Slower than a direct download.
Download multiple files from list of URLs	Downloads files from a list of URLs in bulk and returns them as a collection of file objects.
Send Mqtt Request	Publishes a message to a topic on an MQTT broker. Does not wait for or return a response from the broker.

Download file as string is capped at approximately 10 MB. Files larger than this limit will cause the step to fail. Use a connector that handles large file transfers natively for bigger payloads.

Notes

Keep the following in mind when using these operations.

Download file as string is capped at approximately 10 MB. Files exceeding this limit error out. Do not use it to pull large files into an automation variable — use a dedicated file-transfer connector for those cases.
Download file via Playwright uses a real headless browser. It is slower than a plain HTTP fetch, but it executes JavaScript, can route through a proxy, and can bypass basic bot-detection. Use it only when a direct fetch fails — reserve the faster Download file as string for plain, publicly accessible files.
Send Mqtt Request is fire-and-forget — it publishes the message and completes. It does not wait for a reply or acknowledgment. Ensure the MQTT broker connection is configured in the platform before using this operation.
Download multiple files from list of URLs fetches each URL in the list; if any individual URL fails, check error-handling configuration to decide whether the step should abort or continue.