[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Network](./puppeteer.protocol.network.md) > [AuthChallenge](./puppeteer.protocol.network.authchallenge.md) > [source](./puppeteer.protocol.network.authchallenge.source.md) ## Protocol.Network.AuthChallenge.source property Source of the authentication challenge. (AuthChallengeSource enum) Signature: ```typescript source?: ('Server' | 'Proxy'); ```