path = 'foo'
@app.route('/<path:path>', methods=['POST'])
def index(path=None):
    # do some stuff...
    return flask.render_template('index.html', path=path)

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/<word>', defaults={'word': 'bird'})
def word_up(word):
    return render_template('whatstheword.html', word=word)

@app.route('/files/<path:path>')
def serve_file(path):
    return send_from_directory(app.config['UPLOAD_DIR'], path, as_attachment=True)

if __name__ == '__main__':
    app.debug = True
    app.run(port=9017)

def index(path=None):
    return render_template('index.html', path=path)

path = '/foo'
app.add_url_rule(path, 'index', index)