api - 使用 Google API、Swift 中的 AFNetworking 缩短 url

Question

在 Google 文档 ( https://developers.google.com/url-shortener/v1/getting_started ) 中，要使用 Google URL shortener，我应该提出如下请求:

POST https://www.googleapis.com/urlshortener/v1/url

Content-Type: application/json

{"longUrl": "http://www.google.com/"}

他们还说我必须进行身份验证:

"Every request your application sends to the Google URL Shortener API needs to identify your application to Google. There are two ways to identify your application: using an OAuth 2.0 token (which also authorizes the request) and/or using the application's API key."

我选择了 API 公钥作为身份验证方法:我为我的 iOS 应用程序创建了一个公钥。然后我使用以下代码进行 POST(AFNetworking，使用 Swift):

func getShortURL(longURL: String){
    let manager = AFHTTPRequestOperationManager()
    let params = [
        "longUrl": longURL
    ]
    manager.POST("https://www.googleapis.com/urlshortener/v1/url?key={my_key_inserted}", parameters: params, success: {
        (operation: AFHTTPRequestOperation!,responseObject: AnyObject!) in
            println("JSON: " + responseObject.description)
        },
        failure: { (operation: AFHTTPRequestOperation!,error: NSError!) in
            println("Error while requesting shortened: " + error.localizedDescription)
    })
} 

但是，我收到日志:请求缩短时出错:请求失败:请求错误 (400)。

请告诉我如何修复它。

Answer 1

您缺少的是为此请求设置正确的 AFNetworking 序列化程序。

由于 Google 响应采用 JSON 格式，因此您应该使用 AFJSONRequestSerializer。

像这样添加 manager.requestSerializer = AFJSONRequestSerializer():

    let manager = AFHTTPRequestOperationManager()
    manager.requestSerializer = AFJSONRequestSerializer()
    let params = ["longUrl": "MYURL"]
    manager.POST("https://www.googleapis.com/urlshortener/v1/url?key=MYKEY", parameters: params, success: {(operation: AFHTTPRequestOperation!,responseObject: AnyObject!) in
        println("JSON: " + responseObject.description)
            }, failure: { (operation: AFHTTPRequestOperation!,error: NSError!) in
        println("Error while requesting shortened: " + error.localizedDescription)
    })