Generating Token By URL Request From ArcGIS Portal?

MehdiPira1

Hi,

I'm trying to generate a token from a Portal url. It generates a token when pasting this link into a web browser:

https://portalUrl/sharing/rest/generateToken?&f=json 

but when I run this code:

<SPAN class="keyword token">function</SPAN> <SPAN class="token function">getToken</SPAN><SPAN class="punctuation token">(</SPAN>portalUrl<SPAN class="punctuation token">,</SPAN> username<SPAN class="punctuation token">,</SPAN> password<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
  <SPAN class="keyword token">var</SPAN> xmlhttp <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">XMLHttpRequest</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
  <SPAN class="keyword token">var</SPAN> url <SPAN class="operator token">=</SPAN> <SPAN class="string token">"https://portalUrl/sharing/rest/generateToken?username=username&password=password&f=json"</SPAN><SPAN class="punctuation token">;</SPAN>


  xmlhttp<SPAN class="punctuation token">.</SPAN><SPAN class="token function">open</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"POST"</SPAN><SPAN class="punctuation token">,</SPAN> url<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">false</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
  xmlhttp<SPAN class="punctuation token">.</SPAN><SPAN class="token function">send</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

  <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>xmlhttp<SPAN class="punctuation token">.</SPAN>status <SPAN class="operator token">==</SPAN> <SPAN class="number