RequestHandler which is subclassed to create web applications, and various supporting classes). • Client- and server-side implementions of HTTP (HTTPServer and AsyncHTTPClient). • An asynchronous networking function: from tornado.httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten asynchronously httpclient import AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility with older versions

HTTP server tornado.httpclient — Asynchronous HTTP client tornado.httputil — Manipulate HTTP headers and URLs tornado.http1connection – HTTP/1.x client/server implementation Asynchronous networking tornado (including RequestHandler which is subclassed to create web applications, and various supporting classes). Client- and server-side implementions of HTTP (HTTPServer and AsyncHTTPClient). An asynchronous networking tornado.httpclient import HTTPClient def synchronous_fetch(url): http_client = HTTPClient() response = http_client.fetch(url) return response.body And here is the same function rewritten

Protocol， HTTP）和 传输控制协议（Transmission Control Protocol，TCP）。这两者都是 请求 - 响应 （request-response）协议，也就是说，有 客户端（client）来初始化请求，并有 服务端 （server）监听请求并向客户端提供响应。请求与响应的内容由协议本身定义。 TCP 是一个底层协议，它描述了信息如何从一个 server 到另一个的细节，不过其并不指定信 读更多关于其他解决方案的内容并尝试实现它们；对于一个像 Rust 这样的底层语言，所有这 些方法都是可行的。 在开始之前，让我们讨论一下线程池应用看起来如何。当尝试设计代码时，首先编写客户端接 口（client interface）有助于指导代码设计。以期望的调用方式来构建 API 代码的结构，接着 在这个结构之内实现功能，而不是先实现功能再设计公有 API。 类似于第十二章项目中使用的测试驱动开发