Multiple feature requests

[snake-4]

Can the following features be added?

• First one being the automatic decompression of Brotli.
• Second is the ability to set the underlying IWebProxy manually using a field of HttpRequest instead of having the library construct a new one from a URI so that it is possible to use different proxy classes that implement IWebProxy which is what some SOCKS libraries do.
• Third one is to have a way to set the Version field of the underlying HttpRequestMessage's so that it is possible to specify the HTTP version to be used.
• And the last one is to have some sort of abstraction over CookieContainer. Ideally an isolation of cookies between different requests and a way to preserve cookies would be pretty good.

[matteocontrini]

Brotli decompression and choosing the HTTP version have been included in the v1.3.0 release:

https://github.com/matteocontrini/PlainHttp/releases/tag/v1.3.0

I'm going to close this issue since I prefer individual issues to be opened, one for reach request/report.