A single endpoint under the /cdn prefix and returns application/json responses. Authentication is performed via a CDN key passed as a Bearer token in the Authorization header — not the standard user authentication used by other API endpoints.

Authentication

Every request must include a valid CDN key in the Authorization header:

Authorization: Bearer cdn_eyJhbGciOiJIUz...

Note: CDN keys are scoped to a workspace and can be managed in the lingohub application settings. An invalid or expired key results in a 401 response.

Endpoint

`POST /cdn/check` -- Check for a Distribution Release

Checks whether a new Distribution Release is available that matches the specified environment, type, and optional version/release filters. If a match is found, the response includes release details and a pre-signed S3 download URL.

Request Body — `CdnCheckRequest`

Field	Type	Required	Description
`distributionEnvironment`	string	Yes	Target environment. Values: `"DEVELOPMENT"`, `"TEST"`, `"STAGING"`, `"PRODUCTION"`
`distributionType`	string	Yes	Target type. Values: `"NATIVE_FORMAT"`, `"MOBILE_SDK_ANDROID"`, `"MOBILE_SDK_IOS"`
`clientVersion`	string	No	Semantic version of the client app (e.g. `"2.1.0"`). Used as a version-specific filter
`clientRelease`	string	No	Release identifier (e.g. `"beta-3"`). Used as an optional filter
`clientUser`	string	No	End-user identifier — logging only
`clientAgent`	string	No	User-agent string of the client — logging only
`clientLanguageCode`	string	No	ISO language code of the client (e.g. `"en-US"`) — logging only

Example Request

{
  "distributionEnvironment": "PRODUCTION",
  "distributionType": "MOBILE_SDK_ANDROID",
  "clientVersion": "2.1.0",
  "clientRelease": "beta-3",
  "clientUser": "user-42",
  "clientAgent": "MyApp/Android",
  "clientLanguageCode": "en-US"
}

Response — `CdnCheckResponse` (when a release is found)

Field	Type	Description
`distributionReleaseId`	string	Unique release identifier (e.g. `"rel_13jNfRcOroAN-1024"`)
`name`	string	Human-readable name of the release
`createdAt`	timestamp	When the release was created
`filesUrl`	string	Pre-signed S3 URL to download the release ZIP file (valid for 24 hours)

Example Response

{
  "distributionReleaseId": "rel_13jNfRcOroAN-1024",
  "name": "your project release",
  "createdAt": "2025-02-24T13:11:30.909+00:00",
  "filesUrl": "https://lingohub-exports.s3.amazonaws.com/distributions/rel_13jNfRcOroAN-1024.zip"
}

If no matching release exists, the endpoint returns 204 No Content with an empty body.

Error Responses

Status	Meaning	Error Field	Error Info
`401`	Unauthorized — CDN key is missing, malformed, invalid, or expired	`AUTHORIZATION`	`CDN_KEY_NOT_FOUND`
`404`	Not Found — no distribution matches the given environment, type, and version	`DISTRIBUTION`	`DISTRIBUTION_NOT_FOUND`
`422`	Unprocessable Entity — validation failed (e.g. invalid language code or semantic version format)	—	—
`429`	Too Many Requests — the workspace's CDN usage budget has been exceeded	`USAGE`	`USAGE_LIMIT_EXCEEDED`
`500`	Internal Server Error — unexpected failure	—	—

Error Response Format — `CdnErrorDetailResponse`

{
  "type": "about:blank",
  "status": 401,
  "detail": "Unauthorized",
  "errors": [
    { "field": "AUTHORIZATION", "infos": ["CDN_KEY_NOT_FOUND"] }
  ]
}