SearchIndex invalid nextToken

Question

I have simple request C# for SearchIndexAsync aws SDK. First time receive response with 'nextToken' field for request other page. I use nextToken value, but receive 'Invalid nextToken'

I perform same request from aws cli and it's working fine.

My code:

```
SearchIndexResponse response = await _iotClient.SearchIndexAsync(new SearchIndexRequest
{
    QueryString = queryString,
    MaxResults = maxResults,
    NextToken = nextToken
});
```

_iotClient is IAmazonIoT

nuget 
.net 8.0
AWSSDK.IoT 3.7.404.2
AWSSDK.Core 3.7.400.58

Update:
Response from aws log

```
AmazonIoTClient 67|2024-12-02T15:36:31.771Z|DEBUG|Received response (truncated to 1024 bytes): [{"nextToken":"AQJnif/ptPp6otTULTCYZu3eV0Be458dLpq/pnT+pHC4bZjcDbBIiRNCLJ9PH7x9xCCIqQDMU0k4gbr+a3CHoMxs+yFnId9gdG2f+FnYFQc3xgSyj7jAyxNdXbN9izAC7KjfAgjs5Xw4smIK50bz3SBbGhrOc6u9eDK3A7qWXpUnsBzr4yh76ds5mfr/WeouzanV+aDz+RR/Gg==","thingGroups":null,"things":[{"attributes":{},"connectivity":{"connected":false,"disconnectReason":null,"timestamp":0},"deviceDefender":null,"shadow":"","thingGroupNames":[],"thingId":"00001f4c-25f8-4d59-9906-6b0c26508c60","thingNam]
```
I use nextToken for the second request, not working and I have this error:

```
AmazonIoTClient 58|2024-12-02T15:37:19.097Z|ERROR|InvalidRequestException making request SearchIndexRequest to https://iot.eu-central-1.amazonaws.com/. Attempt 2. --> Amazon.IoT.Model.InvalidRequestException: Invalid nextToken
```

re:Post Agent · Answer

The issue you're experiencing with the "Invalid nextToken" error in your C# code for the SearchIndexAsync request could be due to a few reasons:

1. Token expiration: The nextToken provided by AWS IoT has a limited validity period. If you're not using the token immediately or within a short time frame after receiving it, it may expire, leading to the "Invalid nextToken" error.

2. Token formatting: Ensure that you're passing the nextToken exactly as received from the previous response, without any modifications or encoding.

3. Inconsistent use of parameters: Make sure you're using the same parameters (like QueryString and MaxResults) in subsequent requests as you did in the initial request that provided the nextToken.

4. SDK version mismatch: Verify that you're using the latest version of the AWS SDK for .NET, as older versions might have issues with token handling.

To troubleshoot this issue:

1. Try to use the nextToken as soon as you receive it from the previous response.

2. Double-check that you're not modifying the nextToken value in any way before using it in the subsequent request.

3. Ensure that your QueryString and other parameters remain consistent between requests.

4. Update your AWS SDK for .NET to the latest version if you haven't already.

5. Implement error handling to catch and log the specific exception details, which might provide more information about the cause of the invalid token.

If the issue persists, you may want to implement a retry mechanism with exponential backoff, or consider breaking your search into smaller chunks with fewer results per request to reduce the likelihood of needing to use the nextToken.

Since the AWS CLI is working fine with the same nextToken, it's likely that the issue is specific to how the token is being handled in your C# code or the SDK implementation. Carefully review your implementation and consider reaching out to AWS support if the problem continues after trying these suggestions.  
**Sources**  
[SearchIndex - AWS IoT](https://docs.aws.amazon.com/iot/latest/apireference/API_SearchIndex.html)  
[ListResourceSharePermissions - AWS RAM](https://docs.aws.amazon.com/ram/latest/APIReference/API_ListResourceSharePermissions.html)

SearchIndex invalid nextToken

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