diff --git a/mercurial/hgweb.py b/mercurial/hgweb.py
--- a/mercurial/hgweb.py
+++ b/mercurial/hgweb.py
@@ -270,18 +270,24 @@ class hgweb(object):
             modified, added, removed = map(lambda x: filterfiles(files, x),
                                            (modified, added, removed))
 
+        diffopts = self.repo.ui.diffopts()
+        showfunc = diffopts['showfunc']
+        ignorews = diffopts['ignorews']
         for f in modified:
             to = r.file(f).read(mmap1[f])
             tn = r.file(f).read(mmap2[f])
-            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f), f, tn)
+            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f,
+                            showfunc=showfunc, ignorews=ignorews), f, tn)
         for f in added:
             to = None
             tn = r.file(f).read(mmap2[f])
-            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f), f, tn)
+            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f,
+                            showfunc=showfunc, ignorews=ignorews), f, tn)
         for f in removed:
             to = r.file(f).read(mmap1[f])
             tn = None
-            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f), f, tn)
+            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f,
+                            showfunc=showfunc, ignorews=ignorews), f, tn)
 
     def changelog(self, pos):
         def changenav(**map):