Feat/http client factory

[jobala]

Overview

The HTTPClientFactory creates an instance of requests with;

• middleware support
• base url -- https://graph.microsoft.com/v1.0
• default sdkVersion header

How the API works

from msgraph_sdk_python import HTTPClientFactory

requests = HTTPClientFactory.with_graph_middlewares(middlewares)

response = requests.get('/me')

Support for proxies

requests.proxies = {
   'http': 'http://localhost:3000',
    'https': 'http://localhost:3000'
}

GZIP compression

Not supported out of the box, will be implemented as a middleware

Enforcing TLS 1.2

Can be done through a HTTPAdapter.
https://lukasa.co.uk/2013/01/Choosing_SSL_Version_In_Requests/
Tracked in #2

[ddyett]

_HTTPClient [](start = 6, length = 11)

shouldn't this just be HTTPClient?

[jobala]

Python compensates for lack of access modifiers with prefixing private fields/classes with an underscore.

[ddyett]

ok so your intent here is that everything is always called through the factory and there are no guarantees made that _HTTPClient wouldn't break in some non-compatible way. I see your point but at the same time callers will work directly against this class and it's not completely abstracted in the library so there'd be some back compat expectations.