Google Cloud Vision Api only return "name" - google-cloud-platform

Question

I am trying to use Google Cloud Vision API.
I am using the REST API in this link.
POST https://vision.googleapis.com/v1/files:asyncBatchAnnotate
My request is
{
"requests": [
{
"inputConfig": {
"gcsSource": {
"uri": "gs://redaction-vision/pdf_page1_employment_request.pdf"
},
"mimeType": "application/pdf"
},
"features": [
{
"type": "DOCUMENT_TEXT_DETECTION"
}
],
"outputConfig": {
"gcsDestination": {
"uri": "gs://redaction-vision"
}
}
}
]
}
But the response is always only "name" like below:
{
"name": "operations/a7e4e40d1e1ac4c5"
}
My "gs" location is valid.
When I write the wrong path in "gcsSource", 404 not found error is coming.
Who knows why my response is weird?

Answer 1

This is expected, it will not send you the output as a HTTP response. To see what the API did, you need to go to your destination bucket and check for a file named "xxxxxxxxoutput-1-to-1.json", also, you need to specify the name of the object in your gcsDestination section, for example: gs://redaction-vision/test.

Answer 2

Since asyncBatchAnnotate is an asynchronous operation, it won't return the result, it instead returns the name of the operation. You can use that unique name to call GetOperation to check the status of the operation.
Note that there could be more than 1 output file for your pdf if the pdf has more pages than batchSize and the output json file names change depending on the number of pages. It isn't safe to always append "output-1-to-1.json".
Make sure that the uri prefix you put in the output config is unique because you have to do a wildcard search in gcs on the prefix you provide to get all of the json files that were created.