JSN API MATLAB POST request

Question

Daniel Baeriswyl 2017-5-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342731-jsn-api-matlab-post-request

评论： Abolfazl Nejatian 2021-5-21

I have problems making a request with a json file in Matlab (using JSONlab)

the request has to be:

$ body=$(cat << EOF
{
  "order": {
    "units": "100", 
    "instrument": "EUR_USD", 
    "timeInForce": "FOK", 
    "type": "MARKET", 
    "positionFill": "DEFAULT"
  }
}
EOF
)
curl \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <AUTHENTICATION TOKEN>" \
  -d "$body" \
  "https://api-fxtrade.oanda.com/v3/accounts/<ACCOUNT>/orders"$

then I do this in Matlab

Auth_Header = http_createHeader('Authorization',['Bearer <AUTHENTICATION TOKEN>']);
Body = ['&units=','100','&instrument=','EUR_USD','&timeInForce=','FOK','&type=','MARKET','&positionFill=','DEFAULT'];
RawOrderInfo = loadjson(urlread2('https://api-fxtrade.oanda.com/v3/accounts/<ACCOUNT>/orders',...
'POST', Body ,Auth_Header)

I know that something with my body is wrong. Can anyone help me and tell me whats wrong with my loadjson request ?

I get a server response: errorMessage: 'Unsupported ContentType: application/x-www-form-urlencoded'

Thank you!

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Answer 1

Kojiro Saito 2017-6-7

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342731-jsn-api-matlab-post-request#answer_269839

在 MATLAB Online 中打开

You're also using urlread2?

I think you should add "Content-Type" header.

Auth_Header = http_createHeader({'Authorization', 'Content-Type'} ,{['Bearer <AUTHENTICATION TOKEN>'], 'application/json'});

Also, if you use MATLAB R2015a or later, it's better to use webwrite.

url = 'https://api-fxtrade.oanda.com/v3/accounts/<ACCOUNT>/orders';
options = weboptions('RequestMethod','post', 'MediaType','application/json');
Body = struct('units', '100', ... 
          'instrument', 'EUR_USD', ...
          'timeInForce', 'FOK', ...
          'type', 'MARKET', ...
          'positionFill', 'DEFAULT');
Body = struct('order', Body);
response = webwrite(url, Body, options);

Hope it works.

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Abolfazl Nejatian 2021-5-21

在 MATLAB Online 中打开

Dear Kojiro

Thank you for your help.

another thing I really need your help is sending a request for Binance API.

well, I think it is not only my question because it many times asked around the net in the Matlab community.

in Binance there are two API, one for the real trade and another for the test trade(demo account).

here is my Matlab code,

unfortunately, it doesn't work. with this piece of code, I try to place a buy or sell order but a bad type result sends back.

% Set up authentication:
APIKey    = '12a2fff338b41101ed886dd1c0ef4f35e96fe0233c23616daed4f2dbd1389526';
APISecret = '3d52b16aa7a0c6cd12fd11e09a955967cfeb839ff729357a0ca272351da75873';
symbol = 'BTCUSDT';
type   = 'limit';      % or 'market'
side   = 'sell';       % or 'buy'
amount =  1.0;
price  =  60540;    % or None
options = weboptions('RequestMethod',apiMethod, 'MediaType','application/json');
Body = struct('symbol', symbol, ... 
          'type', type, ...
          'side', side, ...
          'amount', char(num2str(amount)), ...
          'price', char(num2str(price)), ...
          'APIKey', APIKey,...
          'APISecret', APISecret);
      
webaddress = 'https://testnet.binance.vision/api/v3/order/';
response = webwrite(webaddress, Body, options);

and here is the Python code

def place_trade(symbol, side, order_type, quantity):
    # Setup header with API_KEY
    headers = {'X-MBX-APIKEY': settings.API_KEY}
    # Params require symbol, side, type, quantity and timestamp (for market orders)
    params = {
        'symbol': symbol,
        'side': side,
        'type': order_type,
        'quantity': quantity,
        'timestamp': int(time.time() * 1000)
    }
    # Encode params into url
    url = 'https://api.binance.us/api/v3/order/test?' + urllib.parse.urlencode(params)
    # Create a HMAC SHA256 signature
    secret = bytes(settings.SECRET_KEY.encode('utf-8'))
    signature = hmac.new(secret, urllib.parse.urlencode(params).encode('utf-8'), hashlib.sha256).hexdigest()
    # Add signature to url
    url += f'&signature={signature}'
    # Encode params
    data = urllib.parse.urlencode(params).encode('ascii')
    # Make a POST request
    req = urllib.request.Request(url, data, headers)
    # Open request and convert to string and then to json
    response = urllib.request.urlopen(req)                         # <- line with error
    response_str = response.read().decode('utf-8')
    response_json = json.loads(response_str)
    print(response_json)
place_trade(symbol='BTCUSD', side='BUY', order_type='MARKET', quantity=1)

I greatly appreciate your help.

kind regards,

Abolfazl Nejatian

Abolfazl Nejatian 2021-5-21

i created a new topic for this question.

if you want you can answer there

https://www.mathworks.com/matlabcentral/answers/836418-binance-buy-or-sell-request

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Answer 2

Elbi Mutluoglu 2020-1-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342731-jsn-api-matlab-post-request#answer_411430

curl -XPOST "Content-type: application/json" -d '{ "secret": "your_secret" }' 'https://baseURL/locationHistory/versionNumber/register?key=Your_API_Key'

How can I send this via matlab?

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Kojiro Saito 2020-1-31

在 MATLAB Online 中打开

Try this.

opts = weboptions('ContentType', 'json');
url = 'https://baseURL/locationHistory/versionNumber/register?key=Your_API_Key';
fieldName = 'secret';
fieldValue = 'your_secret';
response = webwrite(url, fieldName, fieldValue, opts);