- 'method' => 'GET', #defaults to GET, could specify POST
- 'key' => 'unique', #unique key
+ 'method' => 'GET', # defaults to GET, could specify POST
+ 'key' => 'unique', # unique key
+ 'skip_empty' => '1', # When the given key value is null or = 0,
+ # skip making a useless http request