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var client = new XMLHttpRequest();
client.open("GET", "https://www.rosettastone.com/gils", true);
client.send();

client.onreadystatechange = function() {
  if(this.readyState == this.HEADERS_RECEIVED) {
    console.log('got headerss')
    var contentType = client.getResponseHeader("X-GI");
    console.log('CT: ', contentType)
  }
}





var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
  
  if (xhr.readyState === 4) {
    console.log('xhr status: ', xhr.status)
    console.log('xhr readyState: ', xhr.readyState)
    console.log('xhr response: ', xhr.response)
    console.log('xhr responseURL: ', xhr.responseURL)
    console.log('xhr responseType: ', xhr.responseType)
    console.log('xhr statusText: ', xhr.statusText)    
    console.log('xhr: ',xhr.responseText)  
    console.log(xhr)
  }
}
xhr.open('GET', 'https://www.rosettastone.com/gils', true);
xhr.setRequestHeader("Accept", "*/*");
xhr.send(null);