@app.route("/checkUser",methods=["POST"])
def check():
username = str(request.form["username"])
password = str(request.form["password"])
cursor = conn.cursor()
cursor.execute("SELECT uname FROM user_details WHERE email='" + username + "' AND password = '"+password+"')")
user = cursor.fetchone()

while user is not None:
return render_template("chat.html")

else:
    return "failed"