MATLAB: How to form this http request correctly in matlab

httpMATLAB

This request, expressed in XML, works fine in a rest client.
I should clarify, that I work inside a corporate firewall. The request goes outside that.
<RestClientRequest>
<option name="httpMethod" value="POST" />
<option name="urlBase" value="https://aWebsite.net" />
<option name="urlPath" value="/atoken" />
<option name="headers">
  <list>
    <KeyValuePair>
      <option name="key" value="Content-Type" />
      <option name="value" value="application/x-www-form-urlencoded" />
    </KeyValuePair>
    <KeyValuePair>
      <option name="key" value="Cache-Control" />
      <option name="value" value="no-cache" />
    </KeyValuePair>
  </list>
</option>
<option name="parameters">
  <list>
    <KeyValuePair>
      <option name="key" value="username" />
      <option name="value" value="me" />
    </KeyValuePair>
    <KeyValuePair>
      <option name="key" value="password" />
      <option name="value" value="verySecret" />
    </KeyValuePair>
    <KeyValuePair>
      <option name="key" value="grant_type" />
      <option name="value" value="password" />
    </KeyValuePair>
  </list>
</option>
<option name="parametersEnabled" value="true" />
<option name="haveTextToSend" value="false" />
<option name="haveFileToSend" value="false" />
<option name="isFileUpload" value="false" />
<option name="textToSend" value="" />
<option name="filesToSend" value="" />
</RestClientRequest>
For the life of me, I cannot express it in matlab, I only ever get back 'Bad Request'. Can anyone help?
 api = 'https://aWebsite.net/aToken';
 body.username = 'me';
 body.password = 'verySecret';
 body.grant_type = 'password';
 options = weboptions('MediaType', 'application/json' ,'RequestMethod','post','ArrayFormat','json');
respon = webwrite(api, body, options);

Best Answer

According to my understanding, you want to read content from a RESTful webservice. When query parameters are to be appended to the URL, something like following should work:
url = 'https://aWebsite.net/aToken';
options = weboptions('RequestMethod', 'post', 'ArrayFormat','json');
data = webread(url,'username', 'me', 'password', 'verySecret', 'grant_type', 'password', options);
To encode the name-value pairs in the body of an HTTP POST request to the web service, you need to use webwrite. The web service defines response. Following example shows how you can use webwrite:
https://in.mathworks.com/help/matlab/ref/webwrite.html#buocii8-2
You can find more information and example about 'webread' and 'webwrite' at following links:
https://in.mathworks.com/help/matlab/ref/webread.html
https://in.mathworks.com/help/matlab/ref/webwrite.html
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