webbrowser.open('mailto:....') launches mail client in local execution environment but not on production server

Question

I am using the following code to launch the e-mail client with pre-defined fields. The e-mail client launches as expected when I test on my local machine, but not on the production server. On the production server I simply get the redirect to '/'. Any suggestions on what could cause the e-mail client to launch? I tested on all browsers I, and did not see any difference in behaviour.

@app.route('/errorform', methods=['GET', 'POST'])
def errorform():
    form = ErrorForm()
    logs = str(open(file, "r").readlines()[int(file_len(file))]).rstrip()
    if form.validate_on_submit():
        if form.includeLogs.data == False:
            webbrowser.open('mailto:test@mail.com?subject=Feedback&body=<insert your message here>')
            return redirect('/')
        else:
            webbrowser.open('mailto:test@mail.com?subject=Feedback&body=<insert your message here> \n\n Logs: %s' % (logs))
            return redirect('/')
    return render_template('main.html', form=form, show_results=0, page = 'errorform')

Answer 1

Ok, since you've got an answer to the first question, here comes a suggestion to the second problem: just redirect to the mailto: URL:

@app.route('/errorform', methods=['GET', 'POST'])
def errorform():
    form = ErrorForm()
    logs = str(open(file, "r").readlines()[int(file_len(file))]).rstrip()
    if form.validate_on_submit():
        if form.includeLogs.data == False:
            return redirect('mailto:test@mail.com?subject=Feedback&body=<insert your message here>')
        else:
            return redirect('mailto:test@mail.com?subject=Feedback&body=<insert your message here> \n\n Logs: %s' % (logs))
    return render_template('main.html', form=form, show_results=0, page = 'errorform')

Worked For Me™ here.