What is CORS In Spring boot | CORS Policy | CORS Interview Questions and Answer | Code Decode |

This video covers CORS policy And how to implement it in the spring Boot application. Why CORS is important And how it works is also explained here.

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What is CORS
CORS is Cross Origin Resource sharing.

Its a violation of Same origin policy

What is same-origin policy (SOP)

The same-origin policy (SOP) is a web security mechanism built into web browsers that influences how websites can access one another. The concept of same-origin policy was introduced by Netscape Navigator 2.02 in 1995,

Without SOP, a malicious website or web application could access another without restrictions. That would allow attackers to easily steal sensitive information from other websites or even perform actions on other sites without user consent.

SOP does not need to be turned on – it is automatically enabled in every browser that supports it.

The SOP mechanism was designed to protect against attacks such as cross-site request forgery (CSRF), which basically attempt to take advantage of vulnerabilities due to differing origins

What is Origin

Two URLs have the same origin if the protocol, port (if specified), and host are the same for both.

Why we Backend developers need CORS if its implemented at browser level?

Though we are just the backend developers working on backend application but we do have Front end application too .

Now Backend and Front end urls are usually

We can clearly see difference in origin. Hence when ever Front end tries to call ur rest APi, It fails due to SOP policy saying No “Access-Control-Allow-Origin” header is present on requested resource. Origin 4200 is not allowed access.

Solution is CORS.

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[padmapriya]

Seriously i miss that😭 because today my interview, the interviewer ask this one

[krishnakowshik]

Some disturbances occurred in the session but fine, Pls continue the related ones .... Take the applause 👏🏻👏🏻👏🏻

[AshutoshMohanty]

This concept is so much used in our day to day writing of the backend services. Would like to request you if you can give a demo presentation on the same concept. It will help a lot of fresher devs.

[akware]

Thanks for wonderful video. It helps to understand things better.

In future can we make series on graphql, that would be unique and helpful as well. Thanks.

[mr.incredible]

Hi I am watching all your videos for th last two days. i am loving it. i have a request. can you share the document and code which you have in your github. I think it might me helpful for future references.

[kunjalchauhan]

Thanks for the wonderful explanation.
Can you cover the topic of handling CORS with spring security?

[RockMB]

Mam please make a detail video on how we will apply CORS &policies with spring security.
Thanks in advance😊

[alokik]

One question that was asked was how spring security secures call from one microservice to another? This is where CORS comes into picture or is it a different story entirely? Could you cover this question please?

[manjulavanipayyavula]

Hi I already subscribed to your channel. please let me know link for full course of spring security, spring boot and other courses.

[pandit-jee-bihar]

To check if CORS is supported by the server/origin, browsers send a preflight request in the background.
The preflight request uses the 'OPTIONS' HTTP verb/method to send the request.

[utkarshshukla]

Mam please make videos on implementation also and mam for Asynchronous communication also

[Kishore_]

i make speed 0.75 to catchup ur speed 😛.Anyway very good video..thanks

[komalpatil]

could you please make vdo on oauth spring security.

[ANILKUMAR-ygmo]

I am the first one watching this video ☺️

[TheSachinpawarcom]

Too fast speed.. not sure why most videos of this channel seems like fast forwarded.
Content is superb but speed needs to be slow

[moggarajesh]

Nice explanation.... could you explain checkmarx concept

[kiranmallikarjun]

Mam Please make videos on convox handler and sqs queue implementation in spring Boot

[balakrushnabehera]

Hi mam could you please create video for implementation part of CORS.

[manishtiwary]

Yaha 1st 2 nd ka competition chal ra Humko bhi koi rank de do 😛

[deepadeshpande]

Why audio is too fast at start..speed sounds like 1:25 speed