tokens: ['In', 'RFC', '', '', 'the', 'general', 'format', 'of', 'a', 'message', 'is', 'given', 'by', 'HTTPmessage', '', 'startline', '', 'headerfield', 'CRLF', '', 'CRLF', '', 'messagebody', '', 'with', 'startline', '', 'requestline', '', 'statusline', 'requestline', '', 'method', 'SP', 'requesttarget', 'SP', 'HTTPversion', 'CRLF', 'method', '', 'token', 'token', '', 'tchar', 'tchar', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'DIGIT', '', 'ALPHA', 'requesttarget', '', 'originform', '', 'absoluteform', '', 'authorityform', '', 'asteriskform', 'HTTPname', '', 'x', '', 'HTTP', 'HTTPversion', '', 'HTTPname', '', 'DIGIT', '', 'DIGIT', 'statusline', '', 'HTTPversion', 'SP', 'statuscode', 'SP', 'reasonphrase', 'CRLF', 'statuscode', '', 'DIGIT', 'reasonphrase', '', '', 'HTAB', '', 'SP', '', 'VCHAR', '', 'obstext', '', 'headerfield', '', 'fieldname', '', 'OWS', 'fieldvalue', 'OWS', 'fieldname', '', 'token', 'fieldvalue', '', '', 'fieldcontent', '', 'obsfold', '', 'fieldcontent', '', 'fieldvchar', '', '', 'SP', '', 'HTAB', '', 'fieldvchar', '', 'fieldvchar', '', 'VCHAR', '', 'obstext', 'obsfold', '', 'CRLF', '', 'SP', '', 'HTAB', '', '', 'obsolete', 'line', 'folding', '', 'see', 'Section', '', 'messagebody', '', 'OCTET']