From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vladimir Alexiev <vladimir.alexiev@ontotext.com>
Subject: org-html-use-unicode-chars breaks source code blocks
Date: Tue, 4 Aug 2015 13:40:58 +0000 (UTC)
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Hi! 
I've set org-html-use-unicode-chars since I want ox-html to leave IRIs as IRIs.
But this has another undesired effect: it breaks <URL> references in code,
since it doesn't escape the brackets.

Eg this:

#+BEGIN_SRC Turtle
@prefix aat:   <http://vocab.getty.edu/aat/>.
#+END_SRC

results in the URL being invisible in the exported HTML.
The fault is here:

(defun org-html-final-function (contents backend info)
  ...
    (when org-html-use-unicode-chars
      (require 'mm-url)
      (mm-url-decode-entities))

previous code carefully escaped the entities in org-html-protect-char-alist, 
only for mm-url-decode-entities to unescape them.

http://article.gmane.org/gmane.emacs.orgmode/94742 is somewhat related.