Dynamic value

ModHeader supports simple dynamic value substitution. In the value fields, if you enter one of these special strings, the values will be replaced at runtime:

• {{uuid}} - A random UUID v4
• {{url}} - The current request URL
• {{url_origin}} - The current request URL's origin
• {{url_hostname}} - The current request URL's hostname
• {{url_path}} - The current request URL's path
• {{url_query.<query_name>}} - The current request URL's query parameter's value. For example, if the request URL is https://example.com/?foo=bar, and the dynamic string is {{url_query.foo}}, then it will be evaluated to bar at runtime.
  • {{url_query.<query_name>}}
• {{existing_value}} - The existing value (if any)
• {{timestamp}} - The current time (in milliseconds since epoch)
• {{iso_date}} - The current time in ISO format (e.g. 2023-07-02T10:42:14.857Z)
• {{utc_date}} - The current time in UTC string format (e.g. Sun, 02 Jul 2023 10:42:25 GMT)
• {{ip_v4}} - A random IP v4 value