A series of stream api. It provides a network request.
Start a network request, use two callbacks to receive server's response data.
Arguments
options(object): the request options, key value style dictionary.
method(string): the HTTP method GET or POST.
url(string): the request url.
headers(string): the HTTP request headers.
type(string): response type, ‘json’,‘text’ or ‘jsonp’(same as ‘json’ in native implementation)
body(string): the HTTP body.
callback(function): A callback function whose argument is the response object of the request. Callback function will receive a response object.
status(number): response status code.
ok(boolean): true if status code is bewteen 200～299.
statusText(string): status text
data(string): response data. It's a object if request option is json/jsonp, or (string) in other type value.
headers(object): response headers
progressCallback(function): A progress callback. This callback will be invoked before request finished.
readyState(number): Current request state.‘1’:request connection opened;‘2’:response headers received.;‘3’:response data is loading;
status(number): response status code.
length(number): bytes of data have received. You can read full length of response from ‘headers’.
statusText(string): status text.
headers(object): response headers.