S3 putobject throwing无效的URI：无法确定URI的格式

Question

I'm working on uploading local files to aws s3 in C# .net, and I'm using putObjectRequest to make the request to aws s3, however, I've just received a thrown exception: Invalid URI: The format of the URI could not be determined. . Here is what I'm doing:

try {
    string testString = @"C:\Path\to\object files\file.jpg";
    PutObjectRequest objReq = new PutObjectRequest
    {
        Key = key,
        ContentType = "JPG",
        BucketName = bucket + "/" + FolderName,
        CannedACL = S3CannedACL.PublicReadWrite,
        FilePath = testString
    };
    PutObjectResponse response = s3Client.PutObject(objReq);
}
catch (Exception ex) 
{
    Console.WriteLine(ex.Message);
}

I carefully checked the BucketName , RegionEndPoint and ServiceURL , they have been set correctly, so I'm thinking the FilePath is not correct. However, after searching the file path format in C#, I think I'm using the correct operator to escape the backslash. Is there any other cause can lead to this exception?

The entire stackTrace is like this:

at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)

at System.Uri..ctor(String uriString)

at Amazon.Runtime.Internal.EndpointResolver.DetermineEndpoint(IClientConfig config, IRequest request)

at Amazon.S3.Internal.AmazonS3PostMarshallHandler.ProcessRequestHandlers(IExecutionContext executionContext)

at Amazon.S3.Internal.AmazonS3PostMarshallHandler.PreInvoke(IExecutionContext executionContext)

at Amazon.S3.Internal.AmazonS3PostMarshallHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.Marshaller.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.S3.Internal.AmazonS3PreMarshallHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.CallbackHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.S3.Internal.AmazonS3ExceptionHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.ErrorCallbackHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.PipelineHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.MetricsHandler.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.Internal.RuntimePipeline.InvokeSync(IExecutionContext executionContext)

at Amazon.Runtime.AmazonServiceClient.Invoke[TRequest,TResponse](TRequest request, IMarshaller`2 marshaller, ResponseUnmarshaller unmarshaller)

at Amazon.S3.AmazonS3Client.PutObject(PutObjectRequest request)

at Camera_Capture.UploadFileToAmazonS3(String Filepath, String camstring, String SerialNumber) in C:\\path\\to\\Program.cs:line 371

Answer 1

It turns out to be a very misleading error message. The problem is from AmazonS3Client(accesskey, secretkey, AmazonS3Config config); was not getting the RegionEndpoint when AmazonS3Config was constructed. I changed the S3 client constructor to AmazonS3Client(accesskey, secretkey, RegionEndpoint.USWest2); and it resolved the error for me. I think Amazon itself should return a message of RegionEndpoint of config is null rather than this misleading message Invalid URI: The format of the URI could not be determined that .net will throw, because it can be caused by many other reasons.