Example: Flask application

This example demonstrates how to create and use a Flask application.

Consider the following code example for using a Flask application:

from flask import Flask
from werkzeug import serving
import re, os

app = Flask(__name__)

@app.route("/")
def hello_world():
    return "<p>Hello, World!</p>"

@app.route("/foo2")
def hello_world2():
    return "<p>Hello, World!</p>"

@app.route('/fit_update', methods=["POST"])
def fit_update():
    return "<p>Fit Update: " + str(request.get_json()) + "</p>"

if __name__ == '__main__':
    PORT = os.getenv('CDSW_READONLY_PORT', '8090')
    app.run(host="127.0.0.1", port=int(PORT))

When creating or modifying an application, you can specify a new value for the CDSW_APP_POLLING_ENDPOINT environmental variable. Update the CDSW_APP_POLLING_ENDPOINT in the Project Settings and add the following to your code:

Figure 1. Setting CDSW_APP_POLLING_ENDPOINT in Project Settings

parent_log_request = serving.WSGIRequestHandler.log_request

def log_request(self, *args, **kwargs):
    if self.path == '/healthcheck':
        return
    parent_log_request(self, *args, **kwargs)

def filter_healthcheck_logs():
    serving.WSGIRequestHandler.log_request = log_request

filter_healthcheck_logs()