假設我們要添加一個我們自己的Middleware,用來記錄每次請求的日志
下面就是一個符合規范的Middleware, 構造函數中接受一個WSGI APP, __call__返回一個WSGI APP.

代碼如下:
class LoggerMiddleware(object):
    '''WSGI middleware'''

    def __init__(self, application):

        self.app = application

    def __call__(self, environ, start_response):

        # write logs

        try:
            return self.app(environ, start_response)
        except Exception, e:
            # write logs
            pass
        finally:
            # write logs
            pass

在項目的__init__.py的main函數中， 在config.make_wsgi_app上包上一層我們的Middleware:

代碼如下:
from pyramid.config import Configurator
    config = Configurator()
    config.scan()
    app = config.make_wsgi_app()

    # Put middleware
    app = LoggerMiddleware(app)

    serve(app, host='0.0.0.0')