SF 563203. Replaced 'has_key()' with 'in'.
diff --git a/Lib/httplib.py b/Lib/httplib.py
index 9d01859..7e308a5 100644
--- a/Lib/httplib.py
+++ b/Lib/httplib.py
@@ -549,7 +549,7 @@
         # If headers already contains a host header, then define the
         # optional skip_host argument to putrequest().  The check is
         # harder because field names are case insensitive.
-        if (headers.has_key('Host')
+        if 'Host' in (headers
             or [k for k in headers.iterkeys() if k.lower() == "host"]):
             self.putrequest(method, url, skip_host=1)
         else: