AWS, Flask, HTTPS
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Basic example - the ssl_context='adhoc'
addition to app.run function.
Code:
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Hello World!"
if __name__ == "__main__":
app.run(ssl_context='adhoc')
Trying to run this gives the following error messages in AWS:
* Serving Flask app "flask031" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it
in a production deployment.
Use a production WSGI server instead.
* Debug mode: off
Traceback (most recent call last):
File
"/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line
506, in generate_adhoc_ssl_pair
from cryptography import x509
ModuleNotFoundError: No module named 'cryptography'
During handling of the above exception, another exception
occurred:
Traceback (most recent call last):
File "/home/ec2-user/environment/flask031.py", line 84, in
<module>
app.run (host="0.0.0.0", port=8080,
ssl_context='adhoc')
File "/usr/local/lib/python3.6/site-packages/flask/app.py",
line 944, in run
run_simple(host, port, self, **options)
File
"/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line
1052, in run_simple
inner()
File
"/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line
1005, in inner
fd=fd,
File
"/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line
848, in make_server
host, port, app, request_handler,
passthrough_errors, ssl_context, fd=fd
File
"/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line
758, in __init__
ssl_context = generate_adhoc_ssl_context()
File
"/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line
592, in generate_adhoc_ssl_context
cert, pkey = generate_adhoc_ssl_pair()
File
"/usr/local/lib/python3.6/site-packages/werkzeug/serving.py", line
512, in generate_adhoc_ssl_pair
raise TypeError("Using ad-hoc certificates
requires the cryptography library.")
TypeError: Using ad-hoc certificates requires the cryptography
library.
Possible Solution - install pyopenssl: