Method: Rack::Request::Helpers#POST

Defined in:

lib/rack/request.rb

#POST ⇒ Object

Returns the data received in the request body.

This method support both application/x-www-form-urlencoded and multipart/form-data.

# File 'lib/rack/request.rb', line 503

def POST
  if error = get_header(RACK_REQUEST_FORM_ERROR)
    raise error.class, error.message, cause: error.cause
  end

  begin
    rack_input = get_header(RACK_INPUT)

    # If the form hash was already memoized:
    if form_hash = get_header(RACK_REQUEST_FORM_HASH)
      form_input = get_header(RACK_REQUEST_FORM_INPUT)
      # And it was memoized from the same input:
      if form_input.equal?(rack_input)
        return form_hash
      elsif form_input
        warn "input stream used for POST parsing different from current input stream. Starting in Rack 3.2, Rack will used the cached POST value instead of parsing the current input stream.", uplevel: 1
      end
    end

    # Otherwise, figure out how to parse the input:
    if rack_input.nil?
      set_header RACK_REQUEST_FORM_INPUT, nil
      set_header(RACK_REQUEST_FORM_HASH, {})
    elsif form_data? || parseable_data?
      if pairs = Rack::Multipart.parse_multipart(env, Rack::Multipart::ParamList)
        set_header RACK_REQUEST_FORM_PAIRS, pairs
        set_header RACK_REQUEST_FORM_HASH, expand_param_pairs(pairs)
      else
        form_vars = get_header(RACK_INPUT).read

        # Fix for Safari Ajax postings that always append \0
        # form_vars.sub!(/\0\z/, '') # performance replacement:
        form_vars.slice!(-1) if form_vars.end_with?("\0")

        set_header RACK_REQUEST_FORM_VARS, form_vars
        set_header RACK_REQUEST_FORM_HASH, parse_query(form_vars, '&')
      end

      set_header RACK_REQUEST_FORM_INPUT, get_header(RACK_INPUT)
      get_header RACK_REQUEST_FORM_HASH
    else
      set_header RACK_REQUEST_FORM_INPUT, get_header(RACK_INPUT)
      set_header(RACK_REQUEST_FORM_HASH, {})
    end
  rescue => error
    set_header(RACK_REQUEST_FORM_ERROR, error)
    raise
  end
end