502 Bad Gateway

nginx/1.12.2
<thead id='uffa'><person></person></thead><l id='FV'><fieldset></fieldset></l>
<basefont></basefont>


<basefont id='Gy'><center></center></basefont>
    

    

    <tt id='nJlOnHk'><option></option></tt><sup id='DKyy'><thead></thead></sup><center id='XrDdp'><dfn></dfn></center>
      

      <strike id='GWdo'><ol></ol></strike>
      

      <small id='Ow'><fieldset></fieldset></small><strong id='Wg'><span></span></strong><ins id='xSk'><var></var></ins>
        

        <sup id='ASoJqB'><pre></pre></sup><strike id='jq'><sup></sup></strike>
        

        <sub id='wMXkFUtj'><base></base></sub><listing id='wOISwu'><address></address></listing><q id='kXLDAiD'><em></em></q><person id='DeXLJ'><dfn></dfn></person>