title: which method needs content-length field?
body: <p>POST or PUT method need content-length in request header field.</p>
  
  <p>Does another method(GET, PATCH, DELETE, OPTIONS, CONNECT, TRACE, HEADER) also need content-length?</p>
  
  <p>About content-length in Response, specification is described in rfc2616.</p>
  
  <blockquote>
    <p>The Content-Length entity-header field indicates the size of the entity-body, in decimal number of OCTETs, sent to the recipient or, in the case of the HEAD method, the size of the entity-body that would have been sent had the request been a GET.</p>
  </blockquote>
  
  <p>Althought, I couldn't find specification about request header..</p>