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azure-form-recognizer

StartRecognizeCustomFormsFromUri returns "Parameter 'Source' is not a valid Uri." for file URI

Using Azure.AI.FormRecognizer 1.0.0-preview.2 and trying to upload a file and then run forms recognition on it. Code is

var fileName = Path.Combine(@"c:\temp\", sourceFile.FileName);
var fileUri = new Uri(fileName);
sourceFile.SaveAs(fileName);

var forms = await recogClient.StartRecognizeCustomFormsFromUri(modelId, fileUri).WaitForCompletionAsync();

The file URI becomes, for example, file:///c:/temp/DC002.pdf which I believe is a valid URI. However, when running StartRecognizeCustomFormsFromUri, I get the error:

Service request failed. Status: 400 (Bad Request) Content: {"error":{"code":"1003","message":"Parameter 'Source' is not a valid Uri."}} Headers: Transfer-Encoding: chunked x-envoy-upstream-service-time: REDACTED apim-request-id: REDACTED Strict-Transport-Security: REDACTED x-content-type-options: REDACTED Date: Wed, 27 May 2020 12:30:01 GMT Content-Type: application/json; charset=utf-8
Solution

  • FileUri needs to be a public accessible URL, you can not point to your local filesystem. If you would like to send a local file, you should send the file as a file stream.

    The Uri is a great way to speed up the processing when your files are already on a blob storage, or any other public accessible cloud storage, saving time of not streaming the file to the Form Recognizer service.