> ## Documentation Index > Fetch the complete documentation index at: https://docs.nika.sh/llms.txt > Use this file to discover all available pages before exploring further. # Remote client > Configure the preview HTTP client with bounded retries, concurrency, polling and logging. export const RemoteContract = () => Preview surface. The root package types the intended workflow HTTP and SSE API. The reference engine does not ship a compatible workflow service today. Do not point it at the stable resident firer or nika model serve. ; The root `Nika` class describes the intended application-to-service boundary. It is useful for adapters, fixtures and interface work today. ## Construct from explicit values ```ts theme={"system"} import { Nika } from '@supernovae-st/nika-client' const nika = new Nika({ url: process.env.NIKA_URL!, token: process.env.NIKA_TOKEN!, timeout: 30_000, retries: 2, concurrency: 24, }) ``` The constructor requires an HTTP or HTTPS origin and bearer token. It removes one trailing slash and uses native `fetch` by default. ## Or read the environment ```ts theme={"system"} const nika = Nika.fromEnv({ timeout: 15_000, concurrency: 8, }) ``` `fromEnv()` reads `NIKA_URL` and `NIKA_TOKEN`, then applies overrides. Missing required values fail at construction. ## Transport policy

HTTP CLIENT · BOUNDED BY DEFAULT

    {`request
        ├── timeout
        ├── concurrency semaphore
        ├── retry: 429 + 5xx only
        └── response
          ├── JSON resource
          └── typed NikaError`}

Retries use exponential backoff and honor bounded `Retry-After`. Ordinary 4xx responses are not retried. Inject `fetch` for middleware or test fixtures, and use `logger` for metadata without recording authorization values. ## Continue Submit, poll and cancel remote work. Every option and default. The production path against the released binary. Keep three server-shaped commands separate.