api - Google App Engine Go-Reddit API返回错误429

我正在尝试在Google App Engine中的Golang中创建Reddit API。我的代码:

package RedditAPI

import(
    "appengine"
    "encoding/json"
    "io/ioutil"
    "net/http"
    "appengine/urlfetch"
    "time"
    "net/url"
)

func GetTopSubmissions(c appengine.Context){
    one, two:=Call(c, "http://www.reddit.com/r/Bitcoin/top.json", "POST", nil);
    c.Infof("%v, %v", one, two);
}


func Call(c appengine.Context, address string, requestType string, values url.Values)(map[string]interface{}, error){
    req, err:=http.NewRequest("GET", address, nil)
    if err!=nil{
        c.Infof("Request: %v", err)
        return nil, err
    }

    req.Header.Add("User-Agent", "This is a very creative name for a Reddit bot v1.0 by /u/username")
    c.Infof("%v", req.Header.Get("User-Agent"))
    c.Infof("%v", req)
    c.Infof("%v", req.UserAgent())

    duration, err:= time.ParseDuration("60s")
    tr := &urlfetch.Transport{Context: c, Deadline: duration}

    resp, err:=tr.RoundTrip(req)
    if err != nil {
        c.Infof("Post: %v", err)
        return nil, err
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        c.Infof("ReadAll: %v", err)
        return nil, err
    }
    result := make(map[string]interface{})
    err = json.Unmarshal(body, &result)
    if err != nil {
        c.Infof("Unmarshal: %v", err)
        c.Infof("%s", body)
        return nil, err
    }
    return result, nil
}

退货

2013/05/23 03:00:34 Unsolicited response received on idle HTTP channel starting with "H"; err=<nil>
2013/05/23 03:01:42 INFO: &{GET http://www.reddit.com/r/Bitcoin/top.json HTTP/1.1 1 1 map[User-Agent:[This is a very creative name for a Reddit bot v1.0 by /u/username]] <nil> 0 [] false www.reddit.com map[] <nil> map[]   <nil>}
2013/05/23 03:01:42 INFO: This is a very creative name for a Reddit bot v1.0 by /u/username
2013/05/23 03:01:42 INFO: map[error:429], <nil>
INFO     2013-05-23 03:01:42,720 server.py:584] default: "GET / HTTP/1.1" 200 81

造成此错误的原因是什么？

最佳答案

HTTP错误429是“请求太多”:http://tools.ietf.org/html/rfc6585#section-4

Reddit在https://github.com/reddit/reddit/wiki/API上说:“每分钟发出的请求不超过30个。这会使您的请求有些突发，但请保持头脑清醒。平均而言，我们每两秒钟收到的请求不应超过一个。”他们还说:“每30秒不要在同一页面上打过多次”。

如果您要为应用程序中的每个用户请求相同的资源，则可以使用GAE的内存缓存支持。如果您请求大量资源，则Reddit Wiki页面上会提及“一次请求多个资源”，因此可能存在一些用于批处理请求的功能(不确定，API并不熟悉)。如果您正在执行cronjob，则可以减少其运行频率。

无论如何，剩下的谜团更多是Reddit API问题，而不是Go问题。用(https://github.com/jzelinskie/reddit)注释的 repo matthewbauer或Reddit API文档可能还有更多。

关于api - Google App Engine Go-Reddit API返回错误429，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16711070/