diff --git a/4chan_x.user.js b/4chan_x.user.js
index ea75571b6..d6f9784c8 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -6417,7 +6417,7 @@
       };
       callbacks = {
         onload: function() {
-          return QR.response(this.response);
+          return QR.response(this);
         },
         onerror: function() {
           delete QR.ajax;
@@ -6447,11 +6447,11 @@
       };
       return QR.ajax = $.ajax($.id('postForm').parentNode.action, callbacks, opts);
     },
-    response: function(html) {
+    response: function(req) {
       var ban, board, err, h1, persona, postID, reply, threadID, tmpDoc, _, _ref, _ref1;
       delete QR.ajax;
       tmpDoc = d.implementation.createHTMLDocument('');
-      tmpDoc.documentElement.innerHTML = html;
+      tmpDoc.documentElement.innerHTML = req.response;
       if (ban = $('.banType', tmpDoc)) {
         board = $('.board', tmpDoc).innerHTML;
         err = $.el('span', {
@@ -6463,6 +6463,8 @@
         }
       } else if (tmpDoc.title !== 'Post successful!') {
         err = 'Connection error with sys.4chan.org.';
+      } else if (req.status !== 200) {
+        err = "Error " + req.statusText + " (" + req.status + ")";
       }
       if (err) {
         if (/captcha|verification/i.test(err.textContent) || err === 'Connection error with sys.4chan.org.') {
diff --git a/src/qr.coffee b/src/qr.coffee
index e752b34a9..89f455e8a 100644
--- a/src/qr.coffee
+++ b/src/qr.coffee
@@ -720,7 +720,7 @@ QR =
 
     callbacks =
       onload: ->
-        QR.response @response
+        QR.response @
       onerror: ->
         delete QR.ajax
         # Connection error, or
@@ -743,11 +743,11 @@ QR =
 
     QR.ajax = $.ajax $.id('postForm').parentNode.action, callbacks, opts
 
-  response: (html) ->
+  response: (req) ->
     delete QR.ajax
 
     tmpDoc = d.implementation.createHTMLDocument ''
-    tmpDoc.documentElement.innerHTML = html
+    tmpDoc.documentElement.innerHTML = req.response
     if ban  = $ '.banType', tmpDoc # banned/warning
       board = $('.board', tmpDoc).innerHTML
       err   = $.el 'span', innerHTML:
@@ -761,6 +761,8 @@ QR =
       $('a', err)?.target = '_blank' # duplicate image link
     else if tmpDoc.title isnt 'Post successful!'
       err = 'Connection error with sys.4chan.org.'
+    else if req.status isnt 200
+      err = "Error #{req.statusText} (#{req.status})"
 
     if err
       if /captcha|verification/i.test(err.textContent) or err is 'Connection error with sys.4chan.org.'