put jpg data from xmlhttprequest into <img /> tag

here is some part of my code

xmlhttp.open("GET", theUrl, true);
 document.imglive.innerHTML = '<img src="data:image/jpeg,' + xmlhttp.responseText + '"/>';
 

that don´t seem to work.
i also tried

document.imglive.src= xmlhttp.responseText;
 

that neither worked

I checked some of the asked questions here but none of the answers where helping at this porblem.

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