> For the complete documentation index, see [llms.txt](https://docs.limio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.limio.com/product/settings/security/cors-configuration.md).
# CORS Configuration
**Introduction to CORS (Cross-Origin Resource Sharing)**
CORS, or Cross-Origin Resource Sharing, is a fundamental web security mechanism, it defines the rules for when and how a web page hosted on one domain can make requests to access resources, such as data or services, on another domain. CORS is a crucial aspect of web security, as it helps prevent malicious websites from making unauthorized requests to sensitive data.
**Understanding Allowed CORS hosts**
In Limio the Allowed CORS hosts list serves as a whitelist, permitting specific domains to make cross-origin requests to the Limio API and access its resources.
The list allows "headless" access to APIs. This means that services or scripts running on servers or in environments without a traditional web browser (i.e., headless) can still make secure requests to the Limio API.
Go to General Settings > Site Security:
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