Policy: A named set of rules that tells Philter which entity types to find (names, SSNs, email addresses, dates, and so on) and what filter strategy to apply to each (redact, replace, mask, encrypt, hash, and others). Every filter request names the policy to apply; Philter ships a policy named default. Policies are authored as JSON; this client treats the policy body as an opaque JSON string.
Context: An arbitrary label used to group requests (for example, by tenant or job). It is passed on each filter request and is echoed back on the response.
Document ID: Philter assigns an identifier to each filtered document and returns it in the x-document-id response header; the client exposes it on the response object.