fix(arista/wireless_manager_api): headers and cookies

Author: stakach

drivers/arista/wireless_manager_api.cr

@@ -20,6 +20,14 @@ class Arista::WirelessManagerAPI < PlaceOS::Driver
     key_type:  "apikeycredentials",
   })
 
+  def on_load
+    transport.before_request do |request|
+      request.headers["Content-Type"] = "application/json"
+      request.headers["Accept"] = "application/json"
+    end
+    on_update
+  end
+
   def on_update
     @key_type = setting?(String, :key_type).presence || "apikeycredentials"
     @key_value = setting(String, :key_value)
@@ -43,7 +51,7 @@ class Arista::WirelessManagerAPI < PlaceOS::Driver
       timeout:  3600,
     }.to_json)
     raise "session failed with: #{response.status} (#{response.status_code})\n#{response.body}" unless response.success?
-    cookies = HTTP::Cookies.from_server_headers(response.headers)
+    cookies = HTTP::Cookies.fill_from_server_headers(response.headers)
     headers = cookies.add_request_headers(HTTP::Headers.new)
 
     response = HTTP::Client.get("https://launchpad.wifi.arista.com/rest/api/v2/services?type=amc", headers: headers)