human
Complete the below
@util.positional(2)
def service_mapping(service_factory, service_path='.*', protocols=None):

    ''''WSGI application that handles a single ProtoRPC service mapping.
    Args:
    service_factory: Service factory for creating instances of service request
    handlers.  Either callable that takes no parameters and returns a service
    instance or a service class whose constructor requires no parameters.
    service_path: Regular expression for matching requests against.  Requests
    that do not have matching paths will cause a 404 (Not Found) response.
    protocols: remote.Protocols instance that configures supported protocols
    on server.'
    '''

=====
What is a the Python program you requested?
assistant
#Here is the Python program you requested.
    service_class = getattr(service_factory, 'service_class', service_factory)
    remote_methods = service_class.all_remote_methods()
    path_matcher = re.compile((_REQUEST_PATH_PATTERN % service_path))
    def protorpc_service_app(environ, start_response):
        'Actual    WSGI    application    function.'
        path_match = path_matcher.match(environ['PATH_INFO'])
        if (not path_match):
            return _HTTP_NOT_FOUND(environ, start_response)
        service_path = path_match.group(1)
        method_name = path_match.group(2)
        content_type = environ.get('CONTENT_TYPE')
        if (not content_type):
            content_type = environ.get('HTTP_CONTENT_TYPE')
        if (not content_type):
            return _HTTP_BAD_REQUEST(environ, start_response)
        content_type = cgi.parse_header(content_type)[0]
        request_method = environ['REQUEST_METHOD']
        if (request_method != 'POST'):
            content = ('%s.%s    is    a    ProtoRPC    method.\n\nService    %s\n\nMore    about    ProtoRPC:    %s\n' % (service_path, method_name, service_class.definition_name().encode('utf-8'), util.PROTORPC_PROJECT_URL))
            error_handler = wsgi_util.error(httplib.METHOD_NOT_ALLOWED, httplib.responses[httplib.METHOD_NOT_ALLOWED], content=content, content_type='text/plain;    charset=utf-8')
            return error_handler(environ, start_response)
        local_protocols = (protocols or remote.Protocols.get_default())
        try:
            protocol = local_protocols.lookup_by_content_type(content_type)
        except KeyError:
            return _HTTP_UNSUPPORTED_MEDIA_TYPE(environ, start_response)
        def send_rpc_error(status_code, state, message, error_name=None):
            'Helper    function    to    send    an    RpcStatus    message    as    response.\n\n                        Will    create    static    error    handler    and    begin    response.\n\n                        Args:\n                                status_code:    HTTP    integer    status    code.\n...