Update http.lua

looks like it should be here

src/http.lua

@@ -62,7 +62,7 @@ local function receiveheaders(sock, headers)
  -- unfold any folded values
  while string.find(line, "^%s") do
  value = value .. line
- line = sock:receive()
+ line, err = sock:receive()
  if err then return nil, err end
  end
  -- save pair in table