feat(gzip): make gzip optional

Allow option to disable gzip compression with a flag (gzipEnable: false)
gzip compression still remains enabled by default

fixes #196

src/coffee/connect/rest.coffee

@@ -67,6 +67,8 @@ class Rest
     if @_options.access_token
       @_options.headers['Authorization'] = "Bearer #{@_options.access_token}"
 
+    @_options.gzipEnable = if !_.isUndefined(opts.gzipEnable) then opts.gzipEnable else true
+
     debug 'rest options: %j', @_options
     return
 
@@ -154,7 +156,7 @@ class Rest
         request_options =
           uri: "#{@_options.uri}#{params.resource}"
           json: true
-          gzip: true
+          gzip: @_options.gzipEnable
           method: params.method
           host: @_options.host
           headers: @_options.headers

src/spec/integration/gzip.spec.coffee

@@ -0,0 +1,65 @@
+debug = require('debug')('spec-integration:products')
+_ = require 'underscore'
+Promise = require 'bluebird'
+{SphereClient} = require '../../lib/main'
+Config = require('../../config').config
+
+newProductType = ->
+  name: 'Vehicle'
+  description: 'A sample type of vehicle'
+
+describe 'gzip compression', ->
+
+  afterEach (done) ->
+    debug 'About to delete all product types'
+    @client.productTypes.all().fetch()
+    .then (payload) =>
+      debug "Deleting #{payload.body.total} product types"
+      Promise.all _.map payload.body.results, (productType) =>
+        @client.productTypes.byId(productType.id).delete(productType.version)
+    .then (results) ->
+      debug "Deleted #{results.length} product types"
+      done()
+    .catch (error) -> done(_.prettify(error))
+  , 20000 # 20 sec
+
+  it 'should use gzip compression by default for all requests', (done) ->
+    @client = new SphereClient
+      config: Config
+      stats:
+        includeHeaders: true
+    debug 'Creating a ProductType'
+    @client.productTypes.save(newProductType())
+    .then (result) =>
+      expect(result.statusCode).toBe 201
+      @client.productTypes.fetch()
+    .then (results) ->
+      gzipReqHeader = results.http.request.headers['accept-encoding']
+      gzipResHeader = results.http.response.headers['content-encoding']
+      expect(gzipReqHeader).toBeTruthy()
+      expect(gzipReqHeader).toBe 'gzip'
+      expect(gzipResHeader).toBeTruthy()
+      expect(gzipResHeader).toBe 'gzip'
+      done()
+    .catch (error) -> done(_.prettify(error))
+  , 20000 # 20 sec
+
+  it 'should not use gzip compression when disbled', (done) ->
+    @client = new SphereClient
+      config: Config
+      stats:
+        includeHeaders: true
+      gzipEnable: false
+    debug 'Creating a ProductType'
+    @client.productTypes.save(newProductType())
+    .then (result) =>
+      expect(result.statusCode).toBe 201
+      @client.productTypes.fetch()
+    .then (results) ->
+      gzipReqHeader = results.http.request.headers['accept-encoding']
+      gzipResHeader = results.http.response.headers['content-encoding']
+      expect(gzipReqHeader).not.toBeDefined()
+      expect(gzipResHeader).not.toBeDefined()
+      done()
+    .catch (error) -> done(_.prettify(error))
+  , 20000 # 20 sec

src/spec/integration/products.spec.coffee

@@ -77,33 +77,6 @@ updatePublish = (version) ->
     {action: "publish"}
   ]
 
-describe 'gzip compression', ->
-  beforeEach (done) ->
-    @client = new SphereClient
-      config: Config
-      stats:
-        includeHeaders: true
-    @client.productTypes.save(newProductType())
-    .then (result) =>
-      expect(result.statusCode).toBe 201
-      @productType = result.body
-      done()
-    .catch (error) -> done(_.prettify(error))
-  , 20000 # 20 sec
-
-  it 'should use gzip compression for requests', (done) ->
-    @client.productTypes.fetch()
-    .then (results) ->
-      gzipReqHeader = results.http.request.headers['accept-encoding']
-      gzipResHeader = results.http.response.headers['content-encoding']
-      expect(gzipReqHeader).toBeTruthy()
-      expect(gzipReqHeader).toBe 'gzip'
-      expect(gzipResHeader).toBeTruthy()
-      expect(gzipResHeader).toBe 'gzip'
-      done()
-    .catch (error) -> done(_.prettify(error))
-  , 20000 # 20 sec
-
 describe 'Integration Products', ->
 
   beforeEach (done) ->