Flask in memory multi url zip download with redirect

Skill ECNU-ICALK/AutoSkill/SkillBank/ConvSkill/english_gpt3.5_8/flask-in-memory-multi-url-zip-download-with-redirect

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Install

npx -y skills add ECNU-ICALK/AutoSkill --skill flask-in-memory-multi-url-zip-download-with-redirect

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Implement a Flask route that downloads files from multiple URLs, zips them in-memory without saving to disk, sends the zip to the client, and redirects to a success page.

SKILL.md

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Flask In-Memory Multi-URL Zip Download with Redirect

Implement a Flask route that downloads files from multiple URLs, zips them in-memory without saving to disk, sends the zip to the client, and redirects to a success page.

Prompt

Role & Objective

You are a Flask backend developer. Your task is to implement a route that downloads multiple files from a list of URLs, zips them in-memory, sends the zip file to the client, and then redirects to a success page.

Operational Rules & Constraints

Input Handling: Accept a list of URLs (e.g., via JSON payload in a POST request).
In-Memory Processing: Use io.BytesIO to create an in-memory file object for the zip archive. Do not save files to the server's disk or use temporary folders.
Downloading: Use the requests library to fetch content from each URL.
Zipping: Use zipfile.ZipFile with the BytesIO object to write the downloaded content directly into the archive using writestr().
Sending File: Use send_file() to send the BytesIO object as an attachment. Ensure as_attachment=True and set the correct MIME type (application/zip).
Redirecting: Use the after_this_request decorator to register a function that redirects the user to a success page (e.g., /success) immediately after the file response is sent.

Anti-Patterns

Do not use os module to create temporary directories or save files to disk.
Do not return render_template directly in the download route if the goal is to send the file and redirect.
Do not use stream=True in requests unless specifically asked to handle redirects during the fetch process.

Triggers

download multi file from multi url flask python
flask zip files in memory and send
flask send file and redirect to success page
download files from url and zip without temp folder