apiEndpointBlockedError (error code 33): API endpoint blocked

• The SDK's DNS check saw a failed connection (cannotConnectToHost) to a URL whose host resolves to 127.0.0.1 or 0.0.0.0, and then reports a blocked endpoint (DNSChecker.swift). Apple describes cannotConnectToHost as a failed attempt to connect to a host (Apple docs).
• A DNS-level ad blocker or content filter that answers the SDK's host with 0.0.0.0. The SDK's own message says requests to RevenueCat are being blocked (rev.cat/dnsBlocking).
• A proxy URL such as http://localhost:8787, with the server stopped, on a device where localhost resolves to the device itself.
• Android has no member for code 33, so a blocked or unreachable host appears there as a plain networkError.

• A retry will fail until the block or the URL is fixed. Retry on the next launch or when the network changes.
• Tell the customer that a content blocker or network setting may be blocking purchases. You cannot fix it for them.
• Do not grant access from the error. The SDK serves cached customer info.

// Swift
do {
  let result = try await Purchases.shared.purchase(package: package)
} catch let error as ErrorCode where error == .apiEndpointBlockedError {
  // handle api endpoint blocked
}

On RevenueDot: With a proxy URL, the SDK's DNS check runs against your RevenueDot host. A server on localhost that is not running therefore shows up as this error, not as a plain networkError. See common problems for emulator and cleartext rules.