RpcHttpRequestDataSource cannot be cast to java.lang.String #255

This issue is still reproducible for HttpTrigger.

I'm trying to upload a file to azure storage through azure fucntion. I was successful in uploading plain text file but the files are getting corrupted for any other type of files. What I observed is that the bytes that I'm receiving are lesser than the actual size(bodyLength < contentLength).

I tried to change the request data type to HttpRequestMessage>, HttpRequestMessage and Byte[] which is throwing cannot conver to string error as reported in https://github.com/Azure/azure-functions-java-worker/issues/239

@FunctionName("UploadFile")
public HttpResponseMessage run(@HttpTrigger(name = "req", methods = { HttpMethod.GET,
HttpMethod.POST }, authLevel = AuthorizationLevel.FUNCTION) HttpRequestMessage> request,
final ExecutionContext context)
throws InvalidKeyException, URISyntaxException, StorageException, IOException {

CloudStorageAccount storageAccount = CloudStorageAccount.parse(_storageConnString);

CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
CloudBlobContainer blobContainer = blobClient.getContainerReference(_containerName);

CloudBlockBlob blob = blobContainer.getBlockBlobReference(fileName);
try {

String body = request.getBody().get();
long bodyLength = body.length();
String contentLength = request.getHeaders().get("content-length");
InputStream inputStream = new ByteArrayInputStream(body.getBytes());
blob.upload(inputStream, Integer.parseInt(bodyLength));

} catch (Exception ex) {
return request.createResponseBuilder(HttpStatus.BAD_REQUEST).body(ex.getMessage()).build();
}

return request.createResponseBuilder(HttpStatus.OK).body("File uploaded successfully").build();

}

My requirement is to upload large files to storage. Any help can be appreciated.