Python server is running successfully, the browser console error: VM227:1 Uncaught SyntaxError: Unexpected token in JSON at position 0 at JSON. The parse () at the XMLHttpRequest. Httprequest. The onreadystatechange httprequest (MyJsp3. JSP: 267). The onreadystatechange @ MyJsp3. JSP: 267 XMLHttpRequest. Send (async) uploadFile @ MyJsp3. JSP: 260 onclick @ MyJsp3. JSP: 61

The server receives the request

Json parsing on doubt problem is a JSP page, I need to bring up a page, whether there was an error parsing json values here