CORS - Cross-origin resource sharing

By Nicho Antony

Today, there are many applications that depend on APIs to access different resources. Some of the popular APIs include weather, time, and fonts.

There are also servers that host these APIs and ensure that information is delivered to websites and other end points. Therefore, making cross-origin calls, is a popular use case for the modern web application.

Let’s say accessing images, videos, iframes, or scripts from another server. This means that the website is accessing resources from a different origin or domain. When building an application to serve up these resources with Express, a request to such external origins may fail. This is where CORS comes in to handle cross-origin requests.

What is CORS?

CORS stands for Cross-Origin Resource Sharing. It allows us to relax the security applied to an API. This is done by bypassing the Access-Control-Allow-Origin headers, which specify which origins can access the API.

In other words, CORS is a browser security feature that restricts cross-origin HTTP requests with other servers and specifies which domains access your resources.

Ex: When we give the Boolean value which indicates to allow cross-site AccessControl as true, request is being made using credentials such as cookies and authorization headers.

Client side:

Server Side:

To send credentials or allow access to resource to a specific domain we give their origin.

Ex: To send credentials or allow access to resource to multiple domains.

Ex: Any page can have access, 

Performing requests with API:

Not every method should be exposed to other origins. Within CORS middleware, you can specify which methods can be accessed by the CORS policy.

To specify which routes of your server can be accessed.

The problem we faced.

In our case, the sent cookie-session was set in Response-header, in set-cookie. But the cookie was not reflecting in Cookie-Storage. Now we have overcome the problem by passing the credentials in CORS.

Conclusion:

When you deploy an application on the server, you should not accept requests from every domain. Instead, you should specify which origin can make requests to your server. This way, you are able to block users who attempt to clone your site or make requests from an unauthorized server. This is important a security measure.

Comments

What is Micro Frontends Part -1

The term Micro Frontends first came up in ThoughtWorks Technology Radar at the end of 2016. It extends the concepts of micro services to the frontend world. The current trend is to build a feature-rich and powerful browser application, aka single page app, which sits on top of a micro service architecture. Over time the frontend layer, often developed by a separate team, grows and gets more difficult to maintain. That’s what we call a Frontend Monolith . The idea behind Micro Frontends is to think about a website or web app as a composition of features which are owned by independent teams. Each team has a distinct area of business or mission it cares about and specialises in. A team is cross functional and develops its features end-to-end, from database to user interface. Monolithic Frontends Organisation in Verticals Top resources for you to learn more about Micro frontends: Server-side rendering micro-frontends – the architecture . : This blog series explores how to implement micro

Things to consider when adopting Cloud Computing

If you are someone who is new cloud computing and is deciding to adopt cloud computing, there are several factors you have to consider. Define the role of Cloud : Are you looking to host your website or a mobile app or you just require storage space for your files. Business flows and Priorities of the Solution : At what point, does your cloud solution fit in. Do I already have a system which I need to upgrade. Find the priorities of the system of your business. Need for Integrations with Internal and External systems : Based on your application needs, we need to figure out the Internal and External services that is essential part or something you cannot replace with your new cloud solution. Once we identify these sub systems and find a possible way to work with your Cloud Framework. Financials of running the solution: Running a cloud deployment can be cost effective or a costly affair, based on how it is setup. Different services have different costing parameters like bandwidt

Vital Resources for Learning Kubernetes

Kubernetes (also known as k8s or “kube”) is an open source container orchestration platform that automates many of the manual processes involved in deploying, managing, and scaling containerized applications. Kubernetes is a complicated beast. There are many moving parts under the hood. Simplifying Container orchestration isn’t easy Here are 10 Vital Resources that will make you a Kubernetes master in no time 1. A Beginner’s Guide to Kubernetes A comprehensive introduction to Kubernetes architecture. 2. A Guide to the Kubernetes Networking Model An in-depth run-through of Kubernetes networking. 3. Amazon EKS Best Practices Guide for Security This guide provides advice about protecting information, systems, and assets that are reliant on EKS while delivering business value through risk assessments and mitigation strategies. 4. Introduction to Using Google Kubernetes Engine; Explain Like I’m Five! Creating your first managed Kubernetes cluster on Google Kubernetes Engine using Te

Apptastic Coder

Search This Blog