diff -r ce99d887585f -r d10c6835497e mercurial/httprepo.py
--- a/mercurial/httprepo.py	Sun May 01 01:04:37 2011 +0800
+++ b/mercurial/httprepo.py	Sun May 01 03:51:04 2011 -0500
@@ -85,7 +85,7 @@
         if headersize > 0:
             # The headers can typically carry more data than the URL.
             encargs = urllib.urlencode(sorted(args.items()))
-            headerfmt = 'X-Arg-%s'
+            headerfmt = 'X-HgArg-%s'
             contentlen = headersize - len(headerfmt % '000' + ': \r\n')
             headernum = 0
             for i in xrange(0, len(encargs), contentlen):