Azure Computer Vision / Read API: readingOrder=natural fails with Internal server error

Question

my resource is located in GermanyWest region. To reproduce this issue I used a sample PDF file from " https://www.acm.org/binaries/content/assets/publications/word_style/interim-template-style/interim-layout.pdf ":

Send a REST Call to Read API endpoint, where you upload a PDF file;

curl --location --request POST 'https://<REPLACEWITHYOURRESOURCENAME>.cognitiveservices.azure.com/vision/v3.2/read/analyze?readingOrder=natural' \
--header 'Content-Type: application/octet-stream' \
--header 'Ocp-Apim-Subscription-Key: <REPLACEWITHYOUROWNKEY>' \
--data-binary '@/C:/Users/Barbaros Oezdemir/Desktop/interim-layout.pdf'

Response Status is 202. So far so good. Next, make the next REST Call to the URL returned in header to get the result;

curl --location --request GET 'https://<REPLACEWITHYOURRESOURCENAME>.cognitiveservices.azure.com/vision/v3.2/read/analyzeResults/ec2ea347-c4f4-416a-9d8d-a3e76cbb2b16' \
--header 'Content-Type: application/json' \
--header 'Ocp-Apim-Subscription-Key: <REPLACEWITHYOUROWNKEY>' \

The response status is 200 OK

The response body is:

{
"status": "failed",
"createdDateTime": "2022-03-29T22:02:31Z",
"lastUpdatedDateTime": "2022-03-29T22:02:31Z",
"analyzeResult": {
"version": "",
"readResults": [],
"errors": [
{
"code": "Unspecified",
"message": "Internal server error."
}
]
}
}

Answer 1

@Barbaros Özdemir The image here is passed with application/octet-stream header but the actual data passed in body is not binary data but instead a local file reference. This call will not pass the binary data. You need to pass the streaming data or actual binary data by reading the file, For example: With python you can read the file and call the API.

image_data = open(image_path, "rb").read()  
headers = {'Ocp-Apim-Subscription-Key': subscription_key,  
           'Content-Type': 'application/octet-stream'}  
params = {'visualFeatures': 'Categories,Description,Color'}  
response = requests.post(  
    analyze_url, headers=headers, params=params, data=image_data)  
response.raise_for_status()  
  
# The 'analysis' object contains various fields that describe the image. The most  
# relevant caption for the image is obtained from the 'description' property.  
analysis = response.json()  
print(analysis)  

Full sample available here.

Since you already have the file as URI you can use the same in body of the request instead of downloading the file to local.
Example:

curl -H "Ocp-Apim-Subscription-Key: <subscriptionKey>" -H "Content-Type: application/json" "<your_endpoint>/vision/v3.2/analyze -d "{\"url\":\"https://www.acm.org/binaries/content/assets/publications/word_style/interim-template-style/interim-layout.pdf\"}"  

UPDATE:
Below call to pass the local file should also work, the error in this case seems to be with the parameter as mentioned in further comments below:

curl --location --request POST "https://<your-resource>.cognitiveservices.azure.com/vision/v3.2/read/analyze?readingOrder=basic" --header "Content-Type: application/octet-stream" --header "Ocp-Apim-Subscription-Key: <your_key>" --data-binary "@/C:\\Users\\test\\Documents\\interim-layout.pdf"  

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