ssl (https) from python flask

Basically here I am in this blog I am going share a code snippet, and I am going to describe what else stupid things I tried and did not work to do that. Well, don’t miss my point, when I am sharing my stupid ordeal, it does not mean, I am proving myself stupid but I am trying to save your time, I am basically telling what did not work in last couple of hour so that it could save your time.

So using flask when I shared a static file migrated directly from django, while working with django we have figured out that we actually don’t need powerful tool like django, instead we can use something very lightweight like flask and it is much easier to switch from django to flask as for both of them default front end templating is jinja. Now after this shift, I had to face a little bit trouble with https, because when I tried https, it is completely blank, I lost my mind, what the hell is going on here? Then I realized for flask probably I need to define my ssl. They got this nice documentation at their website (, I follwed them, and it did not work! Why it won’t work? Alright after couple of trial and google search I realized this is an old school way of doing this, fine, I need to go to new school, obviously! I got myself a new dress and now context looks more pretty {“cert.crt”,”key.key”}. I am impressed but what the hell? it did not work as well, why it won’t work? I lost my mind! hours of fighting, and I got this error:

Traceback (most recent call last):
  File "/usr/lib/python2.7/", line 810, in __bootstrap_inner
  File "/usr/lib/python2.7/", line 763, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/", line 602, in inner
    passthrough_errors, ssl_context).serve_forever()
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/", line 506, in make_server
    passthrough_errors, ssl_context)
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/", line 450, in __init__
    self.socket = ssl_context.wrap_socket(self.socket,
AttributeError: 'OpenSSL.SSL.Context' object has no attribute 'wrap_socket'

It is because I am using a python 2.7 version below 2.7.9.

What else did I try? You won’t want to know, I tried to install pyopenssl on heroku using pip, but looks like it is a ported version and failed to compile on heroku. Now I will write about what I had to do to make it work.

I have to make my cirtificate and keys:

$ openssl genrsa -des3 -passout pass:x -out server.pass.key 2048
 openssl rsa -passin pass:x -in server.pass.key -out server.key
 rm server.pass.key
 openssl req -new -key server.key -out server.csr
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

So now we have server.key and server.csr two files in our directory

Now python script:

from flask import Flask, request, send_from_directory
from flask import render_template

#from OpenSSL import SSL
#context = SSL.Context(SSL.SSLv23_METHOD)

import os

ASSETS_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), '/static')
app = Flask(__name__, static_url_path='/static')

def send_js(path):
    return send_from_directory('js', path)

def signup():
    return render_template('signup.html')

if __name__ == '__main__':
    context = ('server.crt', 'server.key'), threaded=True, debug=True)

Done! Up and running if you got a version >=2.7.9.!

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