S3] About cross-origin access (CORS)

2021-03-12 2021-03-12

1 What is CORS (Cross-Origin Resource Sharing)
2 S3] About cross-origin access (CORS)

What is CORS (Cross-Origin Resource Sharing)

Q&A

Question

What are the benefits of having CORS?

Answer

CORS is a generic term for resource sharing technology, as in Resource Sharing.
It means that S3 can be used for that CORS.

Simply put.
I think the advantage would be that front engineers would not need to reinvent the wheel of some of the resources on the screen (reducing development costs) as they develop.

You have probably seen pages with Google Maps built in on the web screen. (e.g. the access page on the company page)

However, since it is S3, the only content that can be used would be static content.

In order to achieve this CORS, "settings for access from another domain" may be required on the front side.

Naturally, since communication with another server occurs, it is necessary to design and implement the system with security in mind.

alias

Inter-origin resource sharing
cross-origin resource sharing

In the first place

What does "Origin" mean?

What does "Origin" mean?

What is origin?

The origin of data

means the source of the data.

Definition of data source

WEB page
graphics file
Protocol (http://, https;//)
Domain name (example.com)
Port number (80, 443)

Difference between domain and origin

Domain: google.com

Origin: https://google.com:443

The difference from a domain is that it includes protocol (https;//) and port number (443).

What kind of technology is CORS?

Technology that allows a browser to retrieve resources from a different domain (server) than the page being viewed.
Technology that uses HTTP headers to retrieve web resources from a server with CORS settings.