> For the complete documentation index, see [llms.txt](https://docs.saloon.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.saloon.dev/digging-deeper.md).

# Digging Deeper

- [Data Transfer Objects](https://docs.saloon.dev/digging-deeper/data-transfer-objects.md)
- [Building SDKs](https://docs.saloon.dev/digging-deeper/building-sdks.md)
- [Solo Requests](https://docs.saloon.dev/digging-deeper/solo-requests.md)
- [Retrying Requests](https://docs.saloon.dev/digging-deeper/retrying-requests.md)
- [Delaying Requests](https://docs.saloon.dev/digging-deeper/delay.md)
- [Concurrency & Pools](https://docs.saloon.dev/digging-deeper/concurrency-and-pools.md)
- [OAuth2](https://docs.saloon.dev/digging-deeper/oauth2-authentication.md)
- [Authorization Code Grant](https://docs.saloon.dev/digging-deeper/oauth2-authentication/oauth2-authentication.md)
- [Client Credentials Grant](https://docs.saloon.dev/digging-deeper/oauth2-authentication/client-credentials-grant.md)
- [Middleware](https://docs.saloon.dev/digging-deeper/middleware.md)
- [PSR Support](https://docs.saloon.dev/digging-deeper/psr-support.md)