我试图用Golang从Reddit获取html源代码:
package main
import (
"fmt"
"io/ioutil"
"net/http"
"time"
)
func main() {
timeout := time.Duration(5 * time.Second)
client := http.Client{
Timeout: timeout,
}
resp, _ := client.Get("https://www.reddit.com/")
bytes, _ := ioutil.ReadAll(resp.Body)
fmt.Println("HTML:nn", string(bytes))
defer resp.Body.Close()
var input string
fmt.Scanln(&input)
}
第一次试探很好。但是在第二次它遇到了一个错误:
<p>we're sorry, but you appear to be a bot and we've seen too many requests
from you lately. we enforce a hard speed limit on requests that appear to come
from bots to prevent abuse.</p>
<p>if you are not a bot but are spoofing one via your browser's user agent
string: please change your user agent string to avoid seeing this message
again.</p>
<p>please wait 6 second(s) and try again.</p>
<p>as a reminder to developers, we recommend that clients make no
more than <a href="http://github.com/reddit/reddit/wiki/API">one
request every two seconds</a> to avoid seeing this message.</p>
我试图设置延迟,但它仍然不起作用。对不起我的英语不好。
Reddit不希望他们的网站上有自动扫描程序\抓取器,并且具有机器人保护机制。以下是他们的建议:
每两秒一个请求
只需在请求之间添加延迟即可。
timeout
有不同的用途。 超时是例程运行的上限。您需要的是后续请求之间的sleep
。
time.Sleep(6 * time.Second)