Flask redirect to URL with variable

Question

I want to make a redirection to a URL and pass variable 'file' to it , can someone please help . Here is the view :

@app.route('/api/uploads/<string:file>/', methods=['GET','COPY']) 
def download(file):
   sub = db.session.query(func.max(Content.Hits).label('max_hit')).subquery()
  contenu = db.session.query(Content).join(sub, sub.c.max_hit == Content.Hits).all()
name1 = contenu[0].name

if name1 == file:
   return redirect('http://192.168.198.134:5000/api/uploads/<string:file>', file)

else:   
    return send_from_directory(UPLOAD_FOLDER, file)

Martijn Pieters · Accepted Answer · 2019-04-26 11:15:44Z

8

This is what the url_for() function is for:

from Flask import url_for

redirect(url_for(download, file=file))

url_for() takes the endpoint name of your view (by default the name of your function, here download), and additional keyword arguments to provide values for the parameters.

Also see the URL Building section in the Quickstart documentation.

edited Apr 26, 2019 at 11:15

answered Jan 29, 2016 at 15:48

Martijn Pieters

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4 Comments

Rzozi Over a year ago

sorry but the URL points to another flask server running on another machine . i think url_for can be used if i redirect to a page on the same server

Martijn Pieters Over a year ago

@Rzozi: then use url_for() to build the path, and then post-process that URL to set the servername.

Rzozi Over a year ago

@MartijnPerters : Can i do it like this : return redirect('192.168.198.134:5000 %s' % url_for(download,file=file)

Martijn Pieters Over a year ago

You'll have to be careful to escape the path element properly. url_for() handles this for you already.

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