Add Gzip to response types (#795)

* Add gzip to API.py

* pytest for gzip

* fix pytest

* Update test_api.py

* Add gzip to server block of configuration files

* Update api.py to include gzip opts from config

Update logic behind gzip compression  such that compression will only happen when gzip in the Accept-Encoding request header and config.server.gzip is True. Use server charset for encoding/decoding and include charset in Content-Type when compressed.

* Update pytest to use gzip config options

Update pytest to test with (gzip in Accept-Encoding & server.gzip = False), (gzip in Accept-Encoding & server.gzip = True), (gzip not in Accept-Encoding & server.gzip = True)

* Better Content Negotiation (#7)

* Change content negotiation in _get_format()

* Add to pytest and force h to always be string

* Force F_JSON to default response

* Update test_api.py for utf-16 encoding

* better content negotiation pytest.

* Add comments to pytest

* Fix flake 8

* Improve docstring for gzip decorator function

docs/source/configuration.rst

@@ -41,6 +41,7 @@ The ``server`` section provides directives on binding and high level tuning.
     mimetype: application/json; charset=UTF-8  # default MIME type
     encoding: utf-8  # default server encoding
     language: en-US  # default server language
+    gzip: false # default server config to gzip/compress responses to requests with gzip in the Accept-Encoding header
     cors: true  # boolean on whether server should support CORS
     pretty_print: true  # whether JSON responses should be pretty-printed
     limit: 10  # server limit on number of items to return