如何从GET响应中获取cookie？ [英] How to get the cookie from a GET response?

问题描述

我正在编写一个向网站发出GET请求并返回响应cookie的函数：

I am writing a function that makes a GET request to a website and returns the response cookie:

extern crate futures;
extern crate hyper;
extern crate tokio_core;

use tokio_core::reactor::Core;
use hyper::Client;
use std::error::Error;
use hyper::header::Cookie;
use futures::future::Future;

fn get_new_cookie() -> Result<String, Box<Error>> {
    println!("Getting cookie...");
    let core = Core::new()?;
    let client = Client::new(&core.handle());
    println!("Created client");

    let uri = "http://www.cnn.com".parse().expect("Cannot parse url");
    println!("Parsed url");
    let response = client.get(uri).wait().expect("Cannot get url.");
    println!("Got response");
    let cookie = response
        .headers()
        .get::<Cookie>()
        .expect("Cannot get cookie");
    println!("Cookie: {}", cookie);

    Ok(cookie)
}

fn main() {
    println!("{:?}", get_new_cookie());
}

这不起作用;它停留在 client.get（...）字符串上。我得到的输出是：

This doesn't work; it is stuck on the client.get(...) string. The output I'm getting is:

Getting cookie...
Created client
Parsed url

之后没有任何反应。

我做错了什么以及如何更改它以使其有效？

What am I doing wrong and how I can change it so it'd work?

推荐答案

作为< a href =https://stackoverflow.com/a/47854518/155423> Stefan指出，通过调用 wait ，你将线程放到睡到未来完成。但是，该线程需要运行事件循环，因此您只是导致死锁。使用 Core ::运行 更正确。

As Stefan points out, by calling wait, you are putting the thread to sleep until the future has completed. However, that thread needs to run the event loop, so you've just caused a deadlock. Using Core::run is more correct.

作为FrancisGagné指出，Cookie标题用于将cookie 发送到服务器。 SetCookie 用于将Cookie 发送到客户端。它还会将所有Cookie的向量一起返回：

As Francis Gagné points out, the "Cookie" header is used to send a cookie to the server. SetCookie is used to send a cookie to the client. It also returns a vector of all the cookies together:

fn get_new_cookie() -> Result<String, Box<Error>> {
    println!("Getting cookie...");
    let mut core = Core::new()?;

    let client = Client::new(&core.handle());
    println!("Created client");

    let uri = "http://www.cnn.com".parse().expect("Cannot parse url");
    println!("Parsed url");

    let response = core.run(client.get(uri)).expect("Cannot get url.");
    println!("Got response");

    let cookie = response
        .headers()
        .get::<SetCookie>()
        .expect("Cannot get cookie");
    println!("Cookie: {:?}", cookie);

    Ok(cookie.join(","))
}

---

但是，如果您只想要同步API，请使用 Reqwest 而不是。它建立在Hyper之上：

---

However, if you only want a synchronous API, use Reqwest instead. It is built on top of Hyper:

extern crate reqwest;

use std::error::Error;
use reqwest::header::SetCookie;

fn get_new_cookie() -> Result<String, Box<Error>> {
    let response = reqwest::get("http://www.cnn.com")?;

    let cookies = match response.headers().get::<SetCookie>() {
        Some(cookies) => cookies.join(","),
        None => String::new(),
    };

    Ok(cookies)
}

fn main() {
    println!("{:?}", get_new_cookie());
}

这篇关于如何从GET响应中获取cookie？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！