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应用安全包括Cookie、XSRF、用户验证 1、Cookie: 普通Cookie(set, get, clear), 安全Cookie 2、XSRF:同源策略 3、用户验证: tornado 是单线程的,如果上一个请求阻塞(sleep(20)),则下一人请求等待上一个请求完成再执行本次请求 tornado.httpclient.AsyncHTTPClient:tornado提供的异步web请求客户端,用来进行异步web请求 fetch(request.callback = None):用于执行一个web请求,并异步响应一个tornado.httpclient.HttpResponse, request可以是一个url,也可以是一个tornado.httpclient.HttpRequest HTTPRequest, HTTP请求类,该类的构造函数可以接收参数 url:字符串类型,要访问的网址,必传 method: 字符串类型,请求方式 headers: 字典类型或HTTPHeaders,附加协议头 body; HTTP请求体 HTTPResponse, HTTP响应类, code:状态码 reason:状态码的描述 body: 响应数据 err: 异常 实现异步的两种方式:回调函数和协程
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