# Retrieve a single decision

For compatibility with CDN, any web headers (Referrer, User-Agent) will be accepted and passed onto the rule engine

Endpoint: GET /zephr/decision-engine
Version: 2025-07-30
Security: CookieBlaizeSession, JwtQuery, JwtHeaderXBlaizeJwt, JwtHeaderXZephrJwt, JwtBearer, JwtCookie

## Query parameters:

  - `sdkFeatureSlug` (string, required)
    Feature SDK slug
    Example: "featureX"

  - `session` (string, required)
    Zephr Session ID, required for trials.
    Example: "xxx-xxx-xxx"

  - `foreign_id.xxx` (string, required)
    Foreign ID used to identify the user. The foreign system is parsed as the remainder of the parameter key name following 'foreign_id.'
    Example: "xxx-xxx-xxx"

  - `ip` (string, required)
    Client IP address, defaults to request IP.
    Example: "x.x.x.x"

  - `userAgent` (string, required)
    Client user agent
    Example: "Mozilla/5.0 (Macintosh; Intel Mac OS X 11)..."

  - `path` (string, required)
    Request path, required for trials.
    Example: "/x.html"

  - `content_id` (string, required)
    Content ID, used to perform requests to a 3rd party API for additional content information used in making a decision.
    Example: "xxx-xxx-xxx"

  - `jwt` (string, required)
    A Json web token, may include identity or product holding claims.
    Example: "xxx-xxx-xxx"

  - `raw` (boolean, required)
    Should output raw value

## Response 200 fields (*/*):

  - `sdkFeatureSlug` (string, required)
    The slug of the SDK feature which has been evaluated.
    Example: "sdk-feature-1"

  - `outputType` (string)
    Feature output type. Present if there were no errors.
    Enum: "ENUM", "STRING", "NUMBER", "JSON", "TRANSFORMATION", "COMPONENT"

  - `outputValue` (string)
    Feature output value. Present if there were no errors.
  - For the 'JSON_COMPONENT' output type, the response will be stringified JSON.
  - For the 'TRANSFORMATION' output type, the response will contain a stringified JSON array of transformations to be applied, including ENABLE_CONTENT, CUSTOM_COMPONENT, TEMPLATE_COMPONENT and FORM.
    Example: "YES"

  - `error` (string)
    The error message explaining why this decision failed to resolve. Present only if there was an error.
    Example: "500: Internal error ..."