我正在尝试使用他们的upload api将我的本地json文件上传到mapbox.我遵循以下步骤：

>检索S3凭据以暂存文件
>使用S3客户端(如AWS SDK)使用这些凭据将文件上载到S3
>使用暂存文件的URL创建上传
>在上传处理到tileset时检索上载的状态
>上传完成后,使用tileset ID,就像使用任何其他tileset一样.

我完成了第1步和第2步,但在第3步中遇到以下错误：

The remote server returned an error: (422) Unprocessable Entity.

以下是我的代码(步骤1)：

class Program
{
    static void Main(string[] args)
    {
        var getCredsUrl= @"https://api.mapbox.com/uploads/v1/{my_mapbox_username}/credentials?access_token={my_mapbox_token}";
        var request = (HttpWebRequest)WebRequest.Create(getCredsUrl);
        request.AutomaticDecompression = DecompressionMethods.GZip;
        using (var response = (HttpWebResponse)request.GetResponse())
        using (var stream = response.GetResponseStream())
            if (stream != null)
                using (var reader = new StreamReader(stream))
                {
                    var res = reader.ReadToEnd();
                    var mbS3Credentials = JObject.Parse(res);
                    var accessKeyId = (string)mbS3Credentials["accessKeyId"];
                    var bucket = (string)mbS3Credentials["bucket"];
                    var key = (string)mbS3Credentials["key"];
                    var secretAccessKey = (string)mbS3Credentials["secretAccessKey"];
                    var sessionToken = (string)mbS3Credentials["sessionToken"];
                    var serviceUrl = (string)mbS3Credentials["url"];

                    var localFilePath = "c:\\users\\saurabh\\documents\\visual studio 2015\\Projects\\MapboxTileSetUpload\\MapboxTileSetUpload\\data\\localFile.json";
                    var amazonS3Uploader = new AmazonS3Uploader(accessKeyId, secretAccessKey, sessionToken, serviceUrl + "localFile.json");
                    var suucess = amazonS3Uploader.UploadFile(localFilePath, bucket, key);
                    if (suucess)
                    {
                        string createUploadUrl =
                            @"https://api.mapbox.com/uploads/v1/{my_mapbox_username}?access_token={my_mapbox_token}";
                        string tileSet = "{my_mapbox_username}.myTileSet";
                        string s3BucketFileUrl = serviceUrl + "/localFile.json";
                        string name = "example-dataset";
                        var createUpload = new MapboxUploader(createUploadUrl, tileSet, s3BucketFileUrl, name);
                        createUpload.CreateUpload();
                    }
                }
    }
}

上传到Amazon S3(步骤2)：

public class AmazonS3Uploader
{
    private readonly AmazonS3Client _s3Client;

    public AmazonS3Uploader(string accessKeyId, string secretAccessKey, string sessionToken, string serviceUrl)
    {
        var s3Config = new AmazonS3Config
        {
            ServiceURL = serviceUrl, RegionEndpoint = RegionEndpoint.USEast1,
            ForcePathStyle = true,
        };
        _s3Client = new AmazonS3Client(accessKeyId, secretAccessKey, sessionToken, s3Config);
    }


    public bool UploadFile(string filePath, string s3BucketName, string key)
    {
        //save in s3
        var s3PutRequest = new PutObjectRequest
        {
            FilePath = filePath, BucketName = s3BucketName,
            Key = key, CannedACL = S3CannedACL.PublicRead
        };

        s3PutRequest.Headers.Expires = new DateTime(2020, 1, 1);

        try
        {
            PutObjectResponse s3PutResponse = this._s3Client.PutObject(s3PutRequest);
            if (s3PutResponse.HttpStatusCode.ToString() == "OK")
                return true;
            else
                return false;
        }
        catch (Exception ex)
        {
            //handle exceptions
            return false;
        }
    }
}

创建一个Mapbxo上传(第3步：我收到错误)：

public class MapboxUploader
{
    private readonly string _createUploadUrl;
    private readonly string _tileSet;
    private readonly string _s3Fileurl;
    private readonly string _name;
    public MapboxUploader(string createUploadUrl, string tileSet, string s3BucketFileUrl, string name)
    {
        _createUploadUrl = createUploadUrl; _tileSet = tileSet;
        _s3Fileurl = s3BucketFileUrl; _name = name;
    }

    public async Task<bool> HttpClient()
    {
        using (var client = new WebClient())
        {    
            client.BaseAddress = new Uri(this._createUploadUrl);
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            Dictionary<string, string> data = new Dictionary<string, string>() { { "tileset", this._tileSet }, { "url", this._s3Fileurl }, { "name", this._name } };
            var postData = new StringContent(JsonConvert.SerializeObject(data), Encoding.UTF8, "application/json");
            try
            {
                var response = await client.PostAsync(this._createUploadUrl, postData);
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }                
        }
    }
}

我的猜测是我无法在步骤2将文件上传到S3存储桶.以下是步骤2的响应：

在第3步,我得到一个无法处理的错误,错误消息无法访问url因此我猜我的S3存储桶文件无法访问.

当我尝试将上传的文件S3存储桶URL输入浏览器时,我得到访问被拒绝错误：

Mapbox访问令牌范围：

我到底错过了什么.

解决方法:

您的错误位于此行的step1中：

string s3BucketFileUrl = serviceUrl + "/localFile.json";

文件名“/localFile.json”没有去,因为aws已经为你提供了文件所在的完整路径