Add request header with a static value

Create a request header modification rule (part of Transform Rules) to add an `X-Source` HTTP header to the request with a static value (`Cloudflare`).

The following HTTP request header modification rule adds a header named X-Source with a static value (Cloudflare) to the request:

Example

Text in Expression Editor:

starts_with(http.request.uri.path, "/en/")

Selected operation under Modify request header: Set static

Header name: X-Source

Value: Cloudflare

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