Request & response headers

Header rules set, append, or remove a named request or response header.

Behavior

• Set a header to a value (replacing any existing value).
• Append an additional value to an existing header.
• Remove a named header.

Constraints

• Subject to immutable forbidden-header lists (frozen, matched case-insensitively).
• Subject to browser limitations on which headers can be modified.
• Header rules run entirely in the browser via DNR.

Notes

• Forbidden-header lists are owned by the schema package and cannot be overridden by a rule.