   save hist
 
 
+ENABLE_SERVER_HISTOCACHE = true 
+
 window.Histogram = ReactiveComponent
   displayName : 'Histogram'
 

    # extraction from @try_histocache
    proposal = fetch(@props.proposal)
    histocache_key = @histocache_key()
    if proposal.histocache?[histocache_key]
      if histocache_key != @local.histocache?.hash
        @local.histocache =
          hash: histocache_key 

    md5 key

  try_histocache : -> 
    return false if !ENABLE_SERVER_HISTOCACHE
    proposal = fetch(@props.proposal)
    histocache_key = @histocache_key()

