# stream

A series of stream api. It provides a network request.


# fetch

Start a network request, use two callbacks to receive server's response data.

# fetch(options, callback, progressCallback)

  • @options, the request options, key value style dictionary.
    • method, string, the HTTP method GET or POST.
    • url, string, the request url.
    • headers, object, the HTTP request headers.
    • type, string, response type, 'json','text' or 'jsonp'(same as 'json' in native implementation)
    • body, string, the HTTP body.


  • The body parameter only supports arguments of type string. Do not use the JSON format directly, you must convert it to a string.
  • The GET request does not support arguments as body. Please use the URL to set the parameters.
  • The default value of Content-Type is application/x-www-form-urlencoded.
  • If you need to send data in JSON format via POST, you need to set Content-Type to application/json.
  • @callback, 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.


  • Default Content-Type is 'application/x-www-form-urlencoded'. (The type specified in fetch is the response type!)
  • You need to set the Content-Type header to 'application/json' manually if you want to post the json body.


Last Updated: 8/15/2022
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