Angular HTTP Progress Tracking

angular-progress-http is a specialized library providing upload and download progress tracking for HTTP requests within Angular applications. Its `1.0.0` version, which is the latest, is explicitly designed for Angular 4 and 5 environments, relying on the `@angular/http` module and RxJS 5. The library functions as a thin wrapper around Angular's standard `Http` service, extending its capabilities to expose XMLHttpRequest-level progress events through an Angular-friendly observable pattern. Key differentiators include its fluent, immutable API, where `withUploadProgressListener` and `withDownloadProgressListener` methods return new service instances, ensuring that progress handlers are not accidentally overwritten and providing type-safe chaining. This design allows for separate, distinct listeners for both upload and download events, a crucial feature for applications involving large file transfers or data intensive operations during its active development period. Given the deprecation and subsequent removal of `@angular/http` in newer Angular versions, this package is no longer compatible with modern Angular applications.