Cross-Origin-Resource-Policy, also known as CORP, is one of the significant headers in HTTP, which is aimed at enhancing the security of websites and web applications. This header allows you to specify which resources can be accessed from which origins. Essentially, this header provides a security policy that can help prevent unauthorized access and usage of your resources.
Currently, with the increase of attacks and security threats in the web world, the importance of headers like CORP is becoming more evident. This header is a vital part of the web security framework and helps prevent sensitive resources of a website from being accessed through unauthorized origins.
This header is particularly important for developers who are creating web applications, as it can significantly help ensure that resources such as images, fonts, and even private data are only loaded from specified origins.
Some of the definitions that might apply to CORP include same-origin and cross-origin. As the names suggest, the same-origin value means that the resources are only allowed to be accessed by requests coming from the same origin, while cross-origin allows requests from any origin.
In the following example of how to use this header in server configuration:
Header set Cross-Origin-Resource-Policy "same-origin"
Explaining the line by line:
Header set Cross-Origin-Resource-Policy "same-origin": With this line, the CORP header is set to "same-origin", which means that only requests from the same origin are allowed.