Responses with gzip compression should be supported

[kdavisk6]

See #22

Scenario: Simple HTTP request can be made requesting responses be compressed.

Given: a request is made to a known endpoint,
When: the request is sent to the target, accepting gzip responses
And: a response is returned with a 200 response code
And: the response is not empty
Then: the response can be read.

Additional Context
This test case should demonstrate that gzip support is relegated to the Client being used, but should be supported by the default client.