404 (Resource Not Found) error on ImageAnalysisClient.Analyze method

Question

404 (Resource Not Found) error on ImageAnalysisClient.Analyze method

NANDHAKUMAR MURUGESAN 20

I tried AIVision to read captions, objects, texts on an image and I'm getting 404 (Resource Not Found) error on ImageAnalysisClient.Analyze method.

Here is the code

AIVision_Analyze_Error Here is the stack trace

Azure.RequestFailedException: Resource not found

Status: 404 (Resource Not Found)

ErrorCode: 404

Content:

{"error":{"code":"404","message": "Resource not found"}}

Headers:

apim-request-id: REDACTED

Strict-Transport-Security: REDACTED

X-Content-Type-Options: REDACTED

Date: Wed, 05 Mar 2025 20:45:40 GMT

Content-Length: 56

Content-Type: application/json

at Azure.Core.HttpPipelineExtensions.ProcessMessage(HttpPipeline pipeline, HttpMessage message, RequestContext requestContext, CancellationToken cancellationToken)

at Azure.AI.Vision.ImageAnalysis.ImageAnalysisClient.AnalyzeFromImageData(IEnumerable1 visualFeatures, RequestContent content, String language, Nullable1 genderNeutralCaption, IEnumerable`1 smartCropsAspectRatios, String modelVersion, RequestContext context)

at Azure.AI.Vision.ImageAnalysis.ImageAnalysisClient.AnalyzeFromImageData(IEnumerable1 visualFeatures, BinaryData imageData, String language, Nullable1 genderNeutralCaption, IEnumerable`1 smartCropsAspectRatios, String modelVersion, CancellationToken cancellationToken)

at Azure.AI.Vision.ImageAnalysis.ImageAnalysisClient.Analyze(BinaryData imageData, VisualFeatures visualFeatures, ImageAnalysisOptions options, CancellationToken cancellationToken)

at Program.<<main>$>g__AnalyzeImage|0_0() in C:\Nandha\R&D\AIVision\ConsoleApp2\ConsoleApp2\Program.cs:line 44

at Program.<main>$(String[] args) in C:\Nandha\R&D\AIVision\ConsoleApp2\ConsoleApp2\Program.cs:line 8

Thanks in advance for your help!

</main></main>

Pavankumar Purilla 8,335 Reputation points Microsoft External Staff Moderator

2025-03-06T18:34:11.5066667+00:00

Hi NANDHAKUMAR MURUGESAN,
Greetings & Welcome to the Microsoft Q&A forum! Thank you for sharing your query.

The 404 (Resource Not Found) error in ImageAnalysisClient.Analyze is usually caused by an incorrect endpoint, invalid API key, or mismatched resource configuration. Ensure the endpoint URL matches your Azure AI Vision resource region and that you're using a valid API key. Also, verify that the correct Vision AI service is enabled in Azure.

Check that your API call is correctly formatted, including parameters like imageData, visualFeatures, and options. If necessary, explicitly set the model version using options.ModelVersion = "latest";
For more information: Azure Image Analysis client library for .NET - version 1.0.0-beta.3

I hope this information helps.
NANDHAKUMAR MURUGESAN 20 Reputation points

2025-03-06T21:38:39.4+00:00

Thanks for the reply Praveen.

I'm using the correct Endpoint and API Key as the same thing is working in our web app

How do I verify that the correct Vision AI service is enabled in Azure?

Thanks,

Nandha
Pavankumar Purilla 8,335 Reputation points Microsoft External Staff Moderator

2025-03-07T22:23:10.48+00:00

Hi NANDHAKUMAR MURUGESAN,
To verify that the correct Azure AI Vision service is enabled, go to the Azure Portal, navigate to your Vision AI resource, and check the Keys and Endpoint section to ensure they match what you're using in the C# app. Also, confirm that the Computer Vision service is enabled under the Pricing Tier and that your subscription supports image analysis features. Since your web app works but the console app fails, try testing the API using cURL to confirm it responds correctly.
Additionally, check if you're using the right API endpoint—/vision/v3.2/analyze for general image analysis instead of /read/analyze, which is for OCR. If the issue persists, log the actual API key and endpoint in your C# code and ensure your SDK version is up to date.
Pavankumar Purilla 8,335 Reputation points Microsoft External Staff Moderator

2025-03-10T18:57:03.2533333+00:00

Hi NANDHAKUMAR MURUGESAN,
Just following up to see if you had a chance to review the above response. Thank you!
NANDHAKUMAR MURUGESAN 20 Reputation points

2025-03-10T21:09:39.6+00:00
To verify that the correct Azure AI Vision service is enabled, go to the Azure Portal, navigate to your Vision AI resource, and check the Keys and Endpoint section to ensure they match what you're using in the C# app - Checked this and it is correct in my console app

Also, confirm that the Computer Vision service is enabled under the Pricing Tier and that your subscription supports image analysis features

Status:Active

Subscription:Visual Studio Enterprise: BizSpark

API Kind:ComputerVision

Pricing tier:Free

Subscription supports image analysis features -

navigated to https://portal.vision.cognitive.azure.com/gallery/featured

tried Image Analysis -> Extract common tags from images for "https://rigserv.blob.core.windows.net/itemimages/280e235a-cc26-4148-bf20-db41af219945.png"

Result

wall (97.41%) text (95.75%) bottle (89.35%) drink (87.57%) indoor (85.08%) soft drink (64.50%)

try testing the API using cURL to confirm it responds correctly

Tried postman

POST

url:https://eastus.api.cognitive.microsoft.com/vision/v3.2/analyze?data={"url":"https://rigserv.blob.core.windows.net/itemimages/280e235a-cc26-4148-bf20-db41af219945.png"}

Getting the below response
"error": { "code": "InvalidArgument", "innererror": { "code": "InvalidImageUrl", "message": "Image URL is badly formatted." }, "message": "Image URL is badly formatted."

Additionally, check if you're using the right API endpoint

Both https://eastus.api.cognitive.microsoft.com/vision/v3.2/read/analyze and https://eastus.api.cognitive.microsoft.com/vision/v3.2/analyze throw 404 in the console app

In postman

https://eastus.api.cognitive.microsoft.com/vision/v3.2/read/analyze?data={"url":"https://rigserv.blob.core.windows.net/itemimages/280e235a-cc26-4148-bf20-db41af219945.png"} gets me

{ "error": { "code": "BadArgument", "message": "Bad or unrecognizable request JSON or binary file." } }
NANDHAKUMAR MURUGESAN 20 Reputation points

2025-03-14T21:02:28.37+00:00

Hi @Pavankumar Purilla Any updates?
JAYA SHANKAR G S 4,035 Reputation points Microsoft External Staff Moderator

2025-03-18T12:32:10.08+00:00

Hi @NANDHAKUMAR MURUGESAN ,

The Api to analyze is

{your_endpoint}/imageanalysis:analyze?api-version=2023-04-01-preview

Check this for more information and when your passing image URL it should be publicly accessible, if you are having blob url then giving url with sas token.

Let me know if you have further query.

Thank you
NANDHAKUMAR MURUGESAN 20 Reputation points

2025-03-18T14:30:40.66+00:00
Hi @ Jaya Shankar G S Same error as before.

Here are the new things I did

string aiSvcEndpoint = "https://eastus.api.cognitive.microsoft.com/imageanalysis:analyze?api-version=2023-04-01-preview";

My image is publicly accessible (I can access it without a VPN) but I still Created a SAS token as explained in https://learn.microsoft.com/en-us/azure/ai-services/translator/document-translation/how-to-guides/create-sas-tokens?tabs=Containers

ImageAnalysisClient client = new ImageAnalysisClient(new Uri(aiSvcEndpoint), new AzureKeyCredential(aiSvcKey));

VisualFeatures visualFeatures = VisualFeatures.Caption | VisualFeatures.DenseCaptions | VisualFeatures.Objects | VisualFeatures.Read |

VisualFeatures.Tags | VisualFeatures.People | VisualFeatures.SmartCrops;

ImageAnalysisResult result = client.Analyze(imageURL, visualFeatures, options);

Azure.RequestFailedException

HResult=0x80131500

Message=Resource not found

Status: 404 (Resource Not Found)

ErrorCode: 404

Content:

{"error":{"code":"404","message": "Resource not found"}}

Headers:

apim-request-id: REDACTED

Strict-Transport-Security: REDACTED

X-Content-Type-Options: REDACTED

Date: Tue, 18 Mar 2025 14:29:51 GMT

Content-Length: 56

Content-Type: application/json

Source=Azure.AI.Vision.ImageAnalysis

StackTrace:

at Azure.Core.HttpPipelineExtensions.ProcessMessage(HttpPipeline pipeline, HttpMessage message, RequestContext requestContext, CancellationToken cancellationToken)

at Azure.AI.Vision.ImageAnalysis.ImageAnalysisClient.AnalyzeFromUrl(IEnumerable1 visualFeatures, RequestContent content, String language, Nullable1 genderNeutralCaption, IEnumerable`1 smartCropsAspectRatios, String modelVersion, RequestContext context)

at Azure.AI.Vision.ImageAnalysis.ImageAnalysisClient.AnalyzeFromUrl(IEnumerable1 visualFeatures, ImageUrl imageUrl, String language, Nullable1 genderNeutralCaption, IEnumerable`1 smartCropsAspectRatios, String modelVersion, CancellationToken cancellationToken)

at Azure.AI.Vision.ImageAnalysis.ImageAnalysisClient.Analyze(Uri imageUri, VisualFeatures visualFeatures, ImageAnalysisOptions options, CancellationToken cancellationToken)

at Program.<<Main>$>g__AnalyzeImage|0_0() in C:\Nandha\R&D\AIVision\ConsoleApp2\ConsoleApp2\Program.cs:line 38

at Program.<Main>$(String[] args) in C:\Nandha\R&D\AIVision\ConsoleApp2\ConsoleApp2\Program.cs:line 8

Appreciate your help!

Accepted answer

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Pavankumar Purilla 8,335 Reputation points Microsoft External Staff Moderator

2025-03-06T18:34:11.5066667+00:00

Hi NANDHAKUMAR MURUGESAN,
Greetings & Welcome to the Microsoft Q&A forum! Thank you for sharing your query.

The 404 (Resource Not Found) error in ImageAnalysisClient.Analyze is usually caused by an incorrect endpoint, invalid API key, or mismatched resource configuration. Ensure the endpoint URL matches your Azure AI Vision resource region and that you're using a valid API key. Also, verify that the correct Vision AI service is enabled in Azure.

Check that your API call is correctly formatted, including parameters like imageData, visualFeatures, and options. If necessary, explicitly set the model version using options.ModelVersion = "latest";
For more information: Azure Image Analysis client library for .NET - version 1.0.0-beta.3

I hope this information helps.
NANDHAKUMAR MURUGESAN 20 Reputation points

2025-03-06T21:38:39.4+00:00

Thanks for the reply Praveen.

I'm using the correct Endpoint and API Key as the same thing is working in our web app

How do I verify that the correct Vision AI service is enabled in Azure?

Thanks,

Nandha
Pavankumar Purilla 8,335 Reputation points Microsoft External Staff Moderator

2025-03-07T22:23:10.48+00:00

Hi NANDHAKUMAR MURUGESAN,
To verify that the correct Azure AI Vision service is enabled, go to the Azure Portal, navigate to your Vision AI resource, and check the Keys and Endpoint section to ensure they match what you're using in the C# app. Also, confirm that the Computer Vision service is enabled under the Pricing Tier and that your subscription supports image analysis features. Since your web app works but the console app fails, try testing the API using cURL to confirm it responds correctly.
Additionally, check if you're using the right API endpoint—/vision/v3.2/analyze for general image analysis instead of /read/analyze, which is for OCR. If the issue persists, log the actual API key and endpoint in your C# code and ensure your SDK version is up to date.
Pavankumar Purilla 8,335 Reputation points Microsoft External Staff Moderator

2025-03-10T18:57:03.2533333+00:00

Hi NANDHAKUMAR MURUGESAN,
Just following up to see if you had a chance to review the above response. Thank you!
NANDHAKUMAR MURUGESAN 20 Reputation points

2025-03-10T21:09:39.6+00:00

To verify that the correct Azure AI Vision service is enabled, go to the Azure Portal, navigate to your Vision AI resource, and check the Keys and Endpoint section to ensure they match what you're using in the C# app - Checked this and it is correct in my console app

Also, confirm that the Computer Vision service is enabled under the Pricing Tier and that your subscription supports image analysis features

Status:Active

Subscription:Visual Studio Enterprise: BizSpark

API Kind:ComputerVision

Pricing tier:Free

Subscription supports image analysis features -

navigated to https://portal.vision.cognitive.azure.com/gallery/featured

tried Image Analysis -> Extract common tags from images for "https://rigserv.blob.core.windows.net/itemimages/280e235a-cc26-4148-bf20-db41af219945.png"

Result

wall (97.41%) text (95.75%) bottle (89.35%) drink (87.57%) indoor (85.08%) soft drink (64.50%)

try testing the API using cURL to confirm it responds correctly

Tried postman

POST

url:https://eastus.api.cognitive.microsoft.com/vision/v3.2/analyze?data={"url":"https://rigserv.blob.core.windows.net/itemimages/280e235a-cc26-4148-bf20-db41af219945.png"}

Getting the below response
"error": { "code": "InvalidArgument", "innererror": { "code": "InvalidImageUrl", "message": "Image URL is badly formatted." }, "message": "Image URL is badly formatted."

Additionally, check if you're using the right API endpoint

Both https://eastus.api.cognitive.microsoft.com/vision/v3.2/read/analyze and https://eastus.api.cognitive.microsoft.com/vision/v3.2/analyze throw 404 in the console app

In postman

https://eastus.api.cognitive.microsoft.com/vision/v3.2/read/analyze?data={"url":"https://rigserv.blob.core.windows.net/itemimages/280e235a-cc26-4148-bf20-db41af219945.png"} gets me

{ "error": { "code": "BadArgument", "message": "Bad or unrecognizable request JSON or binary file." } }
NANDHAKUMAR MURUGESAN 20 Reputation points

2025-03-14T21:02:28.37+00:00

Hi @Pavankumar Purilla Any updates?
JAYA SHANKAR G S 4,035 Reputation points Microsoft External Staff Moderator

2025-03-18T12:32:10.08+00:00

Hi @NANDHAKUMAR MURUGESAN ,

The Api to analyze is

{your_endpoint}/imageanalysis:analyze?api-version=2023-04-01-preview

Check this for more information and when your passing image URL it should be publicly accessible, if you are having blob url then giving url with sas token.

Let me know if you have further query.

Thank you

Answer 1

Hi @NANDHAKUMAR MURUGESAN ,

First, get the endpoint from your computer vision resource in Keys and Endpoint under

Resource Management.

It will be something like below

https://<resource_name>.cognitiveservices.azure.com

User's image

Next, if you are using sdk then just give the endpoint

ImageAnalysisClient client = new ImageAnalysisClient(new Uri("https://<resource_name>.cognitiveservices.azure.com"), new AzureKeyCredential(aiSvcKey));

If you are using postman to test then you use full rest Api.

https://<resource_name>.cognitiveservices.azure.com/imageanalysis:analyze?api-version=2023-04-01-preview

Storage account URL is not publicly accessible, try it in-cognition mode if is working, if not then create URL with SAS token.

User's image

Please try it and let me know if you have any query.

Thank you

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404 (Resource Not Found) error on ImageAnalysisClient.Analyze method

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