Problem with DynamoDB ScanAsync with blazor wasm (.net 8)

[saikabade]

Describe the bug

Unable to fetch dynamoDb table records, getting the error: The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.

Tried various options of passing the accessId and secret with no luck. The exact same code works fine if the project type is changed to either Blazor Web app or Blazor Server.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

fetching records from a dynamoDb table should work in a blazor webAssembly project

Current Behavior

Created a simple Blazor WebAssembly project and tried to connect to aws dynamoDb to fetch records from a dynamoDb table. When executing await client.ScanAsync(request); error is thrown: The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.

Reproduction Steps

1. Create a new project of type Blazor WebAssembly.
2. Add nuget package AWSSDK.DynamoDBv2 version 3.7.401.3
3. write code to connect and fetch the data:

 AmazonDynamoDBClient client = new AmazonDynamoDBClient(awsUSerID,awsSecret, Amazon.RegionEndpoint.USEast1);
 
 AmazonDynamoDBConfig config = new AmazonDynamoDBConfig() { SignatureVersion = "s3v4"};
 // Define the table name
 string tableName = "Employees";
 List<Employee> listOfOnHoldEmails = new List<Employee>();
 
 string filterExpression = "attribute_exists(#attrName2) AND #attrName2 = :attrValue";
 ScanRequest request = new ScanRequest
 {
     TableName = tableName,
     ExpressionAttributeNames = new Dictionary<string, string>
     {
         { "#attrName1", "Id" },
         { "#attrName2", "Name" },
         
     },
     ExpressionAttributeValues = new Dictionary<string, AttributeValue>
     {
         { ":attrValue", new AttributeValue { S = "testVal" } }
     },
     FilterExpression = filterExpression,
     ProjectionExpression = "#attrName1, #attrName2"
 };            

 try
 {
     var response = await client.ScanAsync(request);
     }
     catch(exception ex){
     
     }

Possible Solution

No response

Additional Information/Context

No response

AWS .NET SDK and/or Package version used

AWSSDK.DynamoDBv2 3.7.401.3

Targeted .NET Platform

.Net 8

Operating System and version

Windows 10

[ashishdhingra]

@saikabade Good afternoon. You mentioned that this issue is a potential regression. Could you please share if:

• Your use case was working when using any previous versions of AWSSDK.DynamoDBv2 package?
• Could you try reproducing the issue with with a normal console application?
• Please share the minimal self-contained reproducible code with all the model classes used.

We also had previous issue #1895 related to Blazor. Unsure if it is related.

Thanks,
Ashish

[Decavoid]

Try setting AWSConfigs.UseAlternateUserAgentHeader = true;

[ashishdhingra]

Try setting AWSConfigs.UseAlternateUserAgentHeader = true;

@Decavoid Thanks for pointing it out. @saikabade Please review.

[saikabade]

@saikabade Good afternoon. You mentioned that this issue is a potential regression. Could you please share if:

• Your use case was working when using any previous versions of AWSSDK.DynamoDBv2 package?
• Could you try reproducing the issue with with a normal console application?
• Please share the minimal self-contained reproducible code with all the model classes used.

We also had previous issue #1895 related to Blazor. Unsure if it is related.

Thanks, Ashish

Hi @ashishdhingra, apologies for the delay. No I cannot reproduce this with a simple console App. I can see it in a Blazor WASM project. Because the issue was happening with a Blazor WASM type project, I switched to Blazor Server application, and the issue was resolved, but the joy was not so long, it worked in the local and in the dev environment and failed in the QA. So, in the QA environment I've started seeing the same error in the openshift pod logs: Unhandled exception rendering component: The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.
Amazon.DynamoDBv2.AmazonDynamoDBException: The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.

[saikabade]

Try setting AWSConfigs.UseAlternateUserAgentHeader = true;

@Decavoid Thanks for pointing it out. @saikabade Please review.

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