$.ajax: Each feature gets its own last-modified list.

src/General/Index.coffee

@@ -431,7 +431,7 @@ Index =
     Index.req = $.ajax "//a.4cdn.org/#{g.BOARD}/catalog.json",
       onloadend: (e) -> Index.load e, state
     ,
-      whenModified: true
+      whenModified: 'Index'
     $.addClass Index.button, 'fa-spin'
 
   load: (e, state) ->

src/General/lib/$.coffee

@@ -64,8 +64,8 @@ $.ajax = do ->
       options.onerror?()
       return
     if whenModified
-      r.setRequestHeader 'If-Modified-Since', lastModified[url] if url of lastModified
-      $.on r, 'load', -> lastModified[url] = r.getResponseHeader 'Last-Modified'
+      r.setRequestHeader 'If-Modified-Since', lastModified[whenModified][url] if lastModified[whenModified]?[url]?
+      $.on r, 'load', -> (lastModified[whenModified] or= {})[url] = r.getResponseHeader 'Last-Modified'
     if /\.json$/.test url
       r.responseType = 'json'
     $.extend r, options

src/Monitoring/ThreadStats.coffee

@@ -75,7 +75,7 @@ ThreadStats =
       return
     ThreadStats.timeout = setTimeout ThreadStats.fetchPage, 2 * $.MINUTE
     $.ajax "//a.4cdn.org/#{ThreadStats.thread.board}/threads.json", onload: ThreadStats.onThreadsLoad,
-      whenModified: true
+      whenModified: 'ThreadStats'
 
   onThreadsLoad: ->
     return unless Conf["Page Count in Stats"] and @status is 200

src/Monitoring/ThreadUpdater.coffee

@@ -241,7 +241,7 @@ ThreadUpdater =
       onloadend: ThreadUpdater.cb.load
       timeout:   $.MINUTE
     ,
-      whenModified: true
+      whenModified: 'ThreadUpdater'
 
   updateThreadStatus: (type, status) ->
     return unless hasChanged = ThreadUpdater.thread["is#{type}"] isnt status