Slack-Dev-201 Reviews Questions

Slack requires an application using HTTP Events API delivery to acknowledge an event request with an HTTP `2xx` response within three seconds. If Slack does not receive a successful acknowledgment in that period, the delivery attempt is treated as unsuccessful and Slack may retry the event. Slack recommends responding with `HTTP 200 OK` as rapidly as possible and separating event ingestion from potentially slow business processing. A robust production architecture typically acknowledges the request immediately, places the event on a queue, and performs downstream processing asynchronously. This prevents expensive API calls, database operations, or external-service dependencies from delaying acknowledgment and producing duplicate deliveries. Returning Block Kit content is unnecessary for acknowledgment, while user logout and scope requests are unrelated. Therefore, A is correct and represents an important Slack scalability and reliability pattern.

Slack explicitly recommends applying the principle of least privilege when choosing OAuth scopes. An application should request only the minimum permissions required to perform its intended functionality. Every unnecessary scope expands the data or operations available to the application and therefore increases the potential impact of credential compromise, implementation defects, or inappropriate application behavior. Slack's security guidance recommends defining minimal scope sets and auditing requested permissions regularly. Marketplace guidance reinforces the same principle because users and administrators may reject applications that request excessive access to sensitive Slack data. Slack does not charge applications according to their number of scopes, and narrower scopes do not exist primarily to improve performance. Broad scopes have not simply been universally deprecated; rather, developers are expected to justify and minimize permissions. Therefore, B accurately captures Slack's security model and recommended application-design practice.

The `section` block is one of the primary Block Kit components for presenting textual content. Slack defines a section as a block that can contain a text object, an array of fields, and optionally a compatible accessory such as a button, image, date picker, or select menu. This makes it appropriate for ordinary explanatory text, headings combined with content, structured information, and interactive message sections. A `divider` block simply produces a visual separation between adjacent blocks and does not carry ordinary text content. An `image` block is intended primarily for image presentation, while a `context` block displays secondary contextual information using text and images in a compact format. For a straightforward textual block in a Slack message, modal, or Home-tab layout, the section block is therefore the standard choice. Accordingly, B is correct.

Among the supplied options, B is the intended answer because Slack's Web API is HTTP-based and Web API responses are JSON objects. Successful and failed responses contain a top-level Boolean `ok` property, together with method-specific fields or an `error` value. Many write methods also accept `application/json` request bodies. However, one technical correction is important: current Slack documentation explicitly states that the Web API is not a REST API. Slack describes it more precisely as a collection of HTTP RPC-style methods with endpoints such as Therefore, “REST with JSON” is not perfectly worded, but it is still the only defensible choice among A–D because SOAP/XML, GraphQL, and gRPC are incorrect. For current Slack terminology, “HTTP RPC-style methods with JSON responses” would be more precise.