server.py

#!/usr/bin/env python

from flask import Flask, request
app = Flask(__name__)

@app.route('/')
def home():
    return 'Hello, world!\n'

@app.route('/sslinfo')
def sslinfo():
    return """I know the following things about the certificate you provided:

Host: {}
X-SSL-Verified: {}
X-SSL-DN: {}
X-SSL-Client-Cert: {}
""".format(
    request.headers.get('Host'),
    request.headers.get('X-SSL-Verified'),
    request.headers.get('X-SSL-DN'),
    request.headers.get('X-SSL-Client-Cert'))

if __name__ == '__main__':
    app.run()