=== Django and AJAX ===
This middleware is another attemp to simplify use AJAX with Dajngo based on JSON-RPC specification (http://json-rpc.org/). It inspired by Java Struts2 JSON-plugin by Musachy Barroso (http://cwiki.apache.org/S2PLUGINS/json-plugin.html) and
SimpleJSONRPCServer by David McNab (http://code.djangoproject.com/wiki/JSON-RPC).
=== Basic configuration ===
 * jsonrpcserver.py must be on your PYTHONPATH.
 * Put class 'jsonrpcserver.JSONRPCServerMiddleware' to Django middleware list in settings.py:
{{{
#!python
MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.middleware.transaction.TransactionMiddleware',
    "jsonrpcserver.JSONRPCServerMiddleware",
)

}}}
 * Add 'jsonrpc_urlpatterns' to 'urls.py' with 'urlpatterns' syntax:
{{{
#!python
from django.conf.urls.defaults import *

urlpatterns = patterns('',
#standard django url configuration here
#...
)

jsonrpc_urlpatterns = patterns('',
    (r'^myapp/json_rpc_service/$', 'myapp.newapp.json_rpc_views'),
    (r'^myapp/json_rpc_geoservice/$', 'myapp.geo.views'),
)
}}}
note: 'myapp.newapp.json_rpc_views' IS NOT A FUNCTION, BUT A MODULE, that contains exposed JSON-RPC functions.
=== Optional Django settings ===
 * JSONRPC_URLPATTERNS_NAME:
    Default value: 'jsonrpc_urlpatterns'.
    Name of the variable in 'urls.py',that contains JSON-RPC URL patterns.
    URL pattern must have Django syntax, but they must contain 
    MODULES NAMES, NOT FUNCTION NAMES as second element in tuple for patterns function.
 * JSONRPC_SERIALIZER:
    Default value: JSONSerializer class - thin wrapper over django.utils.simplejson.
    Name of the JSON serializer class, that must have methods 'serialize' and 'deserialize'
 * JSONRPC_JSONFY_AT_ALL_COSTS:
    Default value: False.
    Boolean flag, that determines whether JSON encoder should throwing an error or
    returning a str() representation of unsupportable python object.
    See implementation of AugmentedJSONEncoder class.
=== Usage ===
 * Write exposed function im module, listed in jsonrpc_urlpatterns:
{{{
#!python
from jsonrpcserver import jsonrpc_function
@jsonrpc_function
def my_python_method(par1, par2):
    return par1 + par2
    ...
}}}
 * use from JS client (e.g. dojo):
{{{
#!python
var  service = new dojo.rpc.JsonService({
    "serviceType": "JSON-RPC", 
    "serviceURL": "/myapp/json_rpc_service/"
});
service.callRemote("my_python_method", ["string1", "string2"])
    .addCallback(...);
}}}
=== Example ===
See example here: http://alx3apps.appspot.com/jsonrpc_example/.
=== Other ===
Written by alx3 (alx3apps(at)gmail(dot)com).
You can use this code under the terms of BSD licence (like Django project).
PS: I would appreciate if someone create project for this middleware in public svn (e.g. googlecode).