The requests-toolbelt is a collection of utilities that extends the functionality of the popular requests HTTP library with additional features for more complex use cases. Developers use it to handle multipart file uploads, streaming requests, authentication methods, and other advanced HTTP operations that aren't included in the base requests library. It's useful when you need finer control over HTTP requests or need to implement functionality like progress tracking, custom authentication, or efficient handling of large files.

Ian Cordasco, Cory Benfield