X-Meta-Site-Id
The HTTP X-Meta-Site-Id response header is an unofficial, Wix-specific header containing the UUID permanently identifying a Wix site across the platform's infrastructure.
Note
The "X-" naming convention for HTTP headers, "X" referring to "experimental", has been deprecated and needs to be transitioned to the formal naming convention for HTTP headers.
Usage
Every site created on the Wix platform receives a permanent meta site ID at the time of creation. This identifier is a UUID (Universally Unique Identifier) remaining constant regardless of domain changes, template switches, or site migrations. The X-Meta-Site-Id header exposes this identifier in HTTP responses, making the underlying site identity visible at the transport layer.
Wix's infrastructure uses the meta site ID for routing decisions, analytics aggregation, and managing resources across its multi-tenant platform. When multiple domains or subdomains map to the same Wix site, the meta site ID provides a stable anchor for correlating traffic back to a single site entity. Automated crawlers and technology detection tools also use this header to identify Wix-hosted properties independent of their public-facing domain.
Unlike numeric identifiers such as X-ShopId on Shopify, the Wix meta site ID uses the standard UUID format, which is common in systems designed to guarantee global uniqueness without coordination.
Values
UUID site identifier
The value is a version 4 UUID formatted as eight hexadecimal characters, followed by three groups of four characters, followed by twelve characters, separated by hyphens. Each Wix site receives one UUID at creation and retains the UUID permanently.
Example
A response from a Wix-hosted site includes the site's permanent UUID. This value uniquely identifies the site within Wix's platform, independent of the domain serving the request.
X-Meta-Site-Id: c9a22227-71a0-4c33-9a89-2fc756b75250
The same UUID appears on every response from the site, making the UUID a reliable fingerprint for identifying Wix-hosted properties across multiple requests or domain aliases.
Takeaway
The X-Meta-Site-Id header carries the permanent UUID assigned to a Wix site at creation. Wix's infrastructure uses this identifier for routing, analytics, and multi-tenant resource management across its platform.