Get specific part of external webpage through ajax which has http auth

Question

I am trying to load the content(specific part) of external webpage through ajax request on my webpage. The curl url for the request is as follow

http://useraname:[email protected]:PORT

So, I tried the following ajax call to get the webpage

var username,password;
$.ajax
  ({
    type: "GET",
    url: "http://X.X.X.X:PORT/",
    dataType: 'text/html',
    async: false,
crossDomain: true,
    data: '{"username": "username", "password" : "secret"}',
    success: function (){
    alert('Thanks for your comment!'); 
    },
error: function (err){
alert(err);
},
beforeSend: function (xhr) {
    xhr.setRequestHeader ("Authorization", "Basic " + btoa(username + ":" + password));
}
});

This gives me a CORS error (Cross-Origin Request Blocked:). After changing dataType from text/html to jsonp. The I received the response with the following error

[Exception... "Failure" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js :: .send :: line 5" data: no]

The success part of the ajax call is not getting executed in either case. Only it goes to error part. If I received the page than I can fetch the specific part by the following method.

  var data = $.parseHTML(res);  //<----try with $.parseHTML().
  $(data).find('div.content').each(function(){
      $('#here').append($(this).html());

How to get the required result?

After suggestion of @GuRu, I tried the following, but still the success method is not getting called.

var username,password;
$.ajax({
  type: "GET",
  url: "http://X.X.X.X:PORT/",
  data: '{"username": "user", "password" : "secret"}',
  async:true, 
  dataType : 'jsonp',  
  crossDomain:true,
    success: function (){
    alert('Thanks for your comment!'); 
    },
  beforeSend: function( xhr ) {
    xhr.overrideMimeType( "text/plain; charset=x-user-defined" );
    xhr.setRequestHeader ("Authorization", "Basic " + btoa(username + ":" + password));
  }
  });

Answer 1

For JSON text:

The MIME media type for JSON text is application/json. The default encoding is UTF-8. (Source: RFC 4627).

For JSONP with callback:

application/javascript

Here are some blog posts that were mentioned in the comments that are relevant.

• Why you shouldn't use text/html for JSON
• Internet Explorer sometimes has issues with application/json
• A rather complete list of Mimetypes and what to use them for

Please check What is the correct JSON content type?