Represent empty body response as blank string. (#47)

Author: ebababi

lib/async/http/faraday/adapter.rb

@@ -234,7 +234,7 @@ def with_timeout(task: Async::Task.current)
 
 				def encoded_body(response)
 					body = response.read
-					return body if body.nil?
+					return +'' if body.nil?
 					content_type = response.headers['content-type']
 					return body unless content_type
 					params = extract_type_parameters(content_type)

test/async/http/faraday/adapter.rb

@@ -101,7 +101,8 @@ def get_response(url = bound_url, path = '/index', adapter_options: {})
 			end
 
 			it "properly handles no content responses" do
-				expect(get_response.body).to be_nil
+				expect(get_response.body).to be == ''
+				expect(get_response.body).not.to be(:frozen?)
 			end
 		end