意外响应代码 403（但在浏览器中工作正常）

我试图从下面的 URL 获取 json 数据

但是当我运行应用程序时它显示

31029-31125 E/Volley: [228776] NetworkUtility.shouldRetryException: Unexpected response code 403 for https://newsapi.org/v2/everything?q=tesla&from=2021-02-23&sortBy=publishedAt&apiK 20ey=c9e4ed47388d413c8af23fc46a330f8e
31029-31125 E/Volley: [228776] NetworkUtility.shouldRetryException: Unexpected response code 403 for https://newsapi.org/v2/everything?q=tesla&from=2021-02-23&sortBy=publishedAt&apiK 20ey=c9e4ed47388d413c8af23fc46a330f8e

但是当我在 Chrome 浏览器中输入 URL 时，它会正常显示 json 数据，但我在我的应用程序中得到了同样的结果 这是我在 kotlin 中的代码

fun getNews(context: Context){
    var queue: RequestQueue = Volley.newRequestQueue(context)
    val url = "https://newsapi.org/v2/everything?q=tesla&from=2021-05-07&sortBy=publishedAt&apiKey=c9e4ed47388d413c8af23fc46a330f8e"
    val request = JsonObjectRequest(
        Request.Method.GET, url, null,
        { response ->
            var list: MutableList<newModel> = mutableListOf<newModel>()
            try {
                var rootArray: JSONArray = response.getJSONArray("articles")
                for(i in 0 until response.length()){
                    var dataObject: JSONObject = rootArray.get(i) as JSONObject
                    list.add(newModel(dataObject.getString("urlToImage") , dataObject.getString("title") , dataObject.getString("description") , dataObject.getString("url")))
                }

            } catch (e: Exception) {
                Toast.makeText(
                    context,
                    "error while parsing the jsonObject/array",
                    Toast.LENGTH_LONG
                ).show()
            }
            callBack.gotTheNewsData(list)
        }) { error ->
        Toast.makeText(context, "Error in responce", Toast.LENGTH_SHORT).show()
    }
    queue.add(request)
}

我遇到了同样的错误，我通过传递标头解决了它“Mozilla/5.0”到请求。

这可以在您的代码上以这种方式完成。

fun getNews(context: Context){
var queue: RequestQueue = Volley.newRequestQueue(context)
val url = "Your URL here"

val request = object: JsonObjectRequest(
    Request.Method.GET, url, null,
    { response ->
        var list: MutableList<newModel> = mutableListOf<newModel>()
        try {
            var rootArray: JSONArray = response.getJSONArray("articles")
            for(i in 0 until response.length()){
                var dataObject: JSONObject = rootArray.get(i) as JSONObject
                list.add(newModel(dataObject.getString("urlToImage") , dataObject.getString("title") , dataObject.getString("description") , dataObject.getString("url")))
            }

        } catch (e: Exception) {
            Toast.makeText(
                context,
                "error while parsing the jsonObject/array",
                Toast.LENGTH_LONG
            ).show()
        }
        callBack.gotTheNewsData(list)
    }) { error ->
    Toast.makeText(context, "Error in responce", Toast.LENGTH_SHORT).show()
}

// overriding function to add Headers.
{
    override fun getHeaders(): MutableMap<String, String> {
        val headers = HashMap<String, String>()
        headers["User-Agent"]="Mozilla/5.0"
        return headers
    }
}

queue.add(request)
}

重要的是要使用object在构造请求之前添加关键字，以便能够重写 getHeaders() 方法。

这个答案帮助我使用 kotlin 在 Volley 请求中添加自定义标头。