On TRTH REST API, Is there a better way to find if there was an error ?

Hello @Beera.Rajesh

You should use HistoricalSearch function to verify if a RIC is valid.

For example:

Request:

POST https://hosted.datascopeapi.reuters.com/RestApi/v1/Search/HistoricalSearch

Authorization: Token <your_auth_token_goes_here>
Content-Type: application/json
Accept-Charset: UTF-8
Prefer: respond-async
{
  "Request": {
    "Identifier": "TRI.N",
    "IdentifierType": "Ric",
    "Range": {
      "Start": "2017-01-01T00:00:00.000Z",
      "End": "2017-05-24T00:00:00.000Z"
    }
  }
}

Response: if the RIC is valid, the field Status in the response is "Valid". The Status field

indicates the the validity of the instrument represented.

HTTP/1.1 200 OK
{
  "@odata.context": "https://hosted.datascopeapi.reuters.com/RestApi/v1/$metadata#Collection(ThomsonReuters.Dss.Api.Search.HistoricalSearchResult)",
  "value": [
    {
      "Identifier": "TRI.N",
      "IdentifierType": "Ric",
      "Source": "",
      "Key": "VjF8MHgzMDAwMDAwMDAwMDAwMDAwfDB4MzAwMDAwMDAwMDAwMDAwMHx8fHx8fHxUUkkuTnw",
      "Description": "Historical Instrument",
      "InstrumentType": "Unknown",
      "Status": "Valid",
      "DomainCode": "6",
      "FirstDate": "1996-01-02T00:00:00.000Z",
      "LastDate": "2017-05-26T00:00:00.000Z",
      "History": []
    }
  ]
}

For more details of the function, please refer to

HistoricalSearch in REST API Reference Tree

Based on my test, if the RIC is wrong, empty value is returned:

Request:

POST https://hosted.datascopeapi.reuters.com/RestApi/v1/Search/HistoricalSearch
Authorization: Token <your_auth_token_goes_here>
Content-Type: application/json
Accept-Charset: UTF-8
Prefer: respond-async
{
  "Request": {
    "Identifier": "ESM9^9",
    "IdentifierType": "Ric",
    "Range": {
      "Start": "2017-01-01T00:00:00.000Z",
      "End": "2017-05-24T00:00:00.000Z"
    }
  }
}

Response:

HTTP/1.1 200 OK

{
  "@odata.context": "https://hosted.datascopeapi.reuters.com/RestApi/v1/$metadata#Collection(ThomsonReuters.Dss.Api.Search.HistoricalSearchResult)",
  "value": []
}

I have contacted TRTH specialist, Thomson-DSS_SWAT@thomson.com, who should be able to help you on this.