Follow the updated specification.

In order to create subresource of /path/ it is required to use POST not PUT.

References:

 * http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.5
 * http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.6

slapos/libnetworkcache.py

@@ -102,7 +102,7 @@ class NetworkcacheClient(object):
     shacache_connection = httplib.HTTPConnection(self.shacache_host,
       self.shacache_port)
     try:
-      shacache_connection.request('PUT', self.shacache_path, file_descriptor,
+      shacache_connection.request('POST', self.shacache_path, file_descriptor,
                                                  self.shacache_header_dict)
       result = shacache_connection.getresponse()
       data = result.read()
@@ -131,7 +131,7 @@ class NetworkcacheClient(object):
       shadir_connection = httplib.HTTPConnection(self.shadir_host,
         self.shadir_port)
       try:
-        shadir_connection.request('PUT', path, json.dumps(data),
+        shadir_connection.request('POST', path, json.dumps(data),
                                                  self.shadir_header_dict)
         result = shadir_connection.getresponse()
         data = result.read()