Python Flask downloading a file returns 0 bytes

content-disposition, download, flask, python

Solution

All that header does is tell the browser to treat the response data as a downloadable file with a certain name. It doesn't actually set any response data which is why it's blank.

You'd need to set the file contents on the response for it to work.

@app.route("/<file_name>")
def getFile(file_name):
    headers = {"Content-Disposition": "attachment; filename=%s" % file_name}
    with open(file_name, 'r') as f:
        body = f.read()
    return make_response((body, headers))

EDIT - Cleaned up code a little based on api docs

Problem

Here is the code my flask server is running: ``` from flask import Flask, make_response import os app = Flask(__name__) @app.route("/") def index(): return str(os.listdir(".")) @app.route("/<file_name>") def getFile(file_name): response = make_response() response.headers["Content-Disposition"] = ""\ "attachment; filename=%s" % file_name return response if __name__ == "__main__": app.debug = True app.run("0.0.0.0", port = 6969) ``` If the user goes to the site, it prints the files in the directory. However if you go to site:6969/filename it should download the file. However I am doing something wrong as the file size always 0 bytes and the downloaded file has no data in it. Any thoughts. I tried adding the content-length header and that didn't work. Don't know what else it could be.

Original source