Recent Flask Posts from Tech Monger

Script to Recover Web Application After Crash

2019-06-14T13:54:00.029529Z

So you have web application running in production but it goes down unexpectedly and you get midnight calls to take up application. In this post we will build simple script that will recover web application after server crash due to over resource utilization.

Custom Validation Messages with WTForms

2018-11-11T09:18:28.423182Z

While using WTF or Flask-WTF for the form validation you would often find yourself adding custom validation messages according to the requirement of your web application. You can always use WTF's ValidationError API however in this tutorial we will show you clever hack to add validation messages during page rendering. We will show example code with flask but you can use this method with any other framework which is using WTF for form validation.

Flask Basic Access Authentication

2018-08-10T04:35:26.912615Z

If you are writing simple and minimalist web application or api using Python and Flask which requires user login without database then you can use HTTP Basic Authentication to authorize user login. This authentication is part of HTTP protocol RFC 7617 and does not require session or cookies for implementation. Client implementation is supported by browsers hence you need not write client side code like html, css and javascript. In this tutorial we will learn how to implement server side code in flask from scratch without using plugin or existing libraries. Also it is strongly advised to understand theory of How Basic Access Authentication Works before we dive into code.

Email Functionality in Flask without Mail Server

2018-08-07T19:05:22.466132Z

Often web application needs to implement mail features for user verification, notification or to implement as trivial functionality as contact form. If your web host does not provide mail server then you can use external solution like mailgun which provides push email functionality along with other useful features using Rest API. It also provides free 10, 000 emails per month before charging you for the service. Learn how you can implement this with python and flask. Previously we have built contact form with flask and ReCaptcha. We will further develop contact form in this tutorial by adding email support.

Python Customized ATOM Feeds Generator without Feed Services

2018-08-07T19:05:07.964151Z

If you have custom content management system written in python with direct control on your code then you can publish your blog feeds without using feed services like feedburner. With custom code you will also be able to generate feeds for specific tags on your blog. In this post we will generate feeds using python module called werkzeug.

Host web site from Home without Static IP

2018-08-07T19:04:41.783407Z

If you want to host web application from home computer or with raspberry pi then you can use free and open source software Localunnel. Localtunnel is simple to use and works behind Network Address Translator (NAT) which means it does not require you to have Public IP. Nor it assumes you to have control over firewall configuration of router. In this tutorial we will demonstrate it by building simple python web application in flask and host it using Gunicorn. However if you have static website or dynamic web application running on Apache, NGNIX or Microsoft IIS locally then you can also follow along by directly jumping to the exposing web app section.

Flask Simple User Login without Extension

2018-08-10T05:56:47.819696Z

In this tutorial we will learn how to build simple user authentication mechanism in Flask without using any login extensions. It's good idea to use existing extensions however if you want more control over how user session cookies are getting handled or if you are not sure about working of an existing extensions then you can quickly roll out your own code to build something very simple. We will make use of Flask-SqlAlchemy to read and write into the database.

Integrate ReCaptcha in Flask Web App without Plugin

2018-08-07T19:02:07.836333Z

In this article we will learn to integrate Google ReCaptcha into flask web application without using any flask extension to prevent bots from submitting spam.

Secure Passwords in Python With Werkzeug

2018-08-07T19:01:56.280012Z

In this article we will learn how to implement secure user authentication system using python werkzeug. We will store secure passwords with salted hashes and later we will verify entered user password in plaintext against it's password hash to authenticate user.

Python Flask Openshift Application Deployment

2018-08-07T19:01:33.544212Z

In this tutorial we will learn deployment of flask application on openshift. I assume that you have some working knowledge of openshift, python, flask and git.