</span><span class='rparen'>)</span> <span class='kw'>unless</span> <span class='id identifier rubyid_header_params'>header_params</span><span class='lbracket'>[</span><span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>Accept</span><span class='tstring_end'>&#39;</span></span><span class='rbracket'>]</span>
  <span class='comment'># HTTP header &#39;Content-Type&#39;
</span>  <span class='id identifier rubyid_content_type'>content_type</span> <span class='op'>=</span> 