Question

使用Api键我可以从 Api Explorer 中获取播放列表中的视频。 不使用OAuth执行获取结果json。这是链接。
https://developers.google.com/apis-explorer/?hl=en_US#p/youtube/v3/youtube.playlistItems.list?part=snippet&playlistId=PLHyTuYqPkZCzt7mWZ4hmmrRdjLJiw6O2T&_h=2&

使用Go on App引擎实现相同的调用失败，错误如下：

 Get https://www.googleapis.com/youtube/v3/playlistItems?alt=json&part=snippet&playlistId=PLHyTuYqPkZCzt7mWZ4hmmrRdjLJiw6O2T: http.DefaultTransport and http.DefaultClient are not available in App Engine. See https://cloud.google.com/appengine/docs/go/urlfetch/

这是我使用的代码：

import (
    "net/http"
    "code.google.com/p/google-api-go-client/googleapi/transport"
    "code.google.com/p/google-api-go-client/youtube/v3"
    "log"
)

    var service *youtube.Service
    func init() {
        var err error
        log.Println("Apikey = ", apiKey)
        client := &http.Client{Transport: &transport.APIKey{Key: apiKey}}
        service, err = youtube.New(client)
        if err != nil {
            log.Println("ERROR in creating youtube New client ", err)
        }
        var items *youtube.PlaylistItemListResponse
        if items, err = service.PlaylistItems.List("snippet").PlaylistId("PLHyTuYqPkZCzt7mWZ4hmmrRdjLJiw6O2T").Do(); err != nil {
            log.Println("Error in fetching playlist items ", err) //this line shows the error
        }
        log.Println(Jsonify(items))
    }

截至目前，我在本地开发服务器上运行我的代码，即 goapp serve

缺少什么？如何使用v3 api和ApiKey获取youtube播放列表视频？

Answer 1

不幸的是，链接的文档并没有解释为什么你的代码不起作用。在App Engine上，您需要使用http.Transport包提供的特殊urlfetch;见https://cloud.google.com/appengine/docs/go/urlfetch/

Answer 2

找到解决方案。下面的代码为我完成了任务。

func FetchVideos(w http.ResponseWriter, r *http.Request) {
    var service *youtube.Service
    ctx := appengine.NewContext(r)

    transport := &transport.APIKey{
        Key:       apiKey,
        Transport: &urlfetch.Transport{Context: ctx}}
    client := &http.Client{Transport: transport}

    var err error
    service, err = youtube.New(client)
    if err != nil {
        log.Println("ERROR in creating youtube New client ", err)
    }
    var items *youtube.PlaylistItemListResponse
    if items, err = service.PlaylistItems.List("snippet").PlaylistId("PLHyTuYqPkZCzt7mWZ4hmmrRdjLJiw6O2T").Do(); err != nil {
        log.Println("Error in fetching playlist items ", err)
    }
    log.Println(Jsonify(items))

如何使用Go on app引擎获取youtube播放列表视频

2 个答案: