python请求模块和连接重用 [英] python requests module and connection reuse

问题描述

我正在使用 python 的请求模块进行 HTTP 通信，我想知道如何重用已经建立的 TCP 连接?requests 模块是无状态的，如果我对同一个 URL 重复调用 get，它不是每次都会创建一个新连接吗?

I am working with python's requests module for HTTP communication, and I am wondering how to reuse already-established TCP connections? The requests module is stateless and if I repeatedly call get for the same URL, wouldn't it create a new connection each time?

谢谢！！

推荐答案

请求模块是无状态的，如果我对同一个 URL 重复调用 get，它不会每次都创建一个新连接吗?

The requests module is stateless and if I repeatedly call get for the same URL, wouldnt it create a new connection each time?

requests 模块不是无状态的；它只是让您忽略状态并有效地使用全局单例状态(如果您选择这样做).*

The requests module is not stateless; it just lets you ignore the state and effectively use a global singleton state if you choose to do so.*

而且它(或者，更确切地说，底层库之一，urllib3)维护一个由(主机名，端口)对键控的连接池，因此如果可以，它通常会神奇地重用连接.

And it (or, rather, one of the underlying libraries, urllib3) maintains a connection pool keyed by (hostname, port) pair, so it will usually just magically reuse a connection if it can.

正如文档所说:

好消息——多亏了 urllib3，keep-alive 是 100% 自动的在一个会话中！您在会话中提出的任何请求都将自动重用合适的连接！

Excellent news — thanks to urllib3, keep-alive is 100% automatic within a session! Any requests that you make within a session will automatically reuse the appropriate connection!

请注意，连接只会释放回池以供重用一旦读取了所有主体数据；确保将 stream 设置为False 或读取 Response 对象的 content 属性.

Note that connections are only released back to the pool for reuse once all body data has been read; be sure to either set stream to False or read the content property of the Response object.

那么，如果可以的话"是什么意思?正如上面的文档所暗示的那样，如果您保持流式响应对象处于活动状态，则它们的连接显然无法重用.

So, what does "if it can" mean? As the docs above imply, if you're keeping streaming response objects alive, their connections obviously can't be reused.

此外，连接池实际上是一个有限的缓存，而不是无限的，因此如果您发送大量连接并且其中两个连接到同一台服务器，您将不会总是重用连接，只是经常.但通常，这就是您真正想要的.

Also, the connection pool is really a finite cache, not infinite, so if you spam out a ton of connections and two of them are to the same server, you won't always reuse the connection, just often. But usually, that's what you actually want.

_{* 此处相关的特定状态是 传输适配器.每个会话都有一个传输适配器.您可以手动指定适配器，也可以指定全局默认值，或者您可以只使用默认的全局默认值，它基本上只是封装了一个 urllib3.PoolManager 来管理其 HTTP 连接.有关更多信息，请阅读文档.}

_{* The particular state relevant here is the transport adapter. Each session gets a transport adapter. You can specify the adapter manually, or you can specify a global default, or you can just use the default global default, which basically just wraps up a urllib3.PoolManager for managing its HTTP connections. For more information, read the docs.}

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