Request Syntax URI Request Parameters Request Body Response Syntax Response Elements Errors Examples See Also

Retrieve

Queries a knowledge base and retrieves information from it.

Request Syntax


POST /knowledgebases/knowledgeBaseId/retrieve HTTP/1.1
Content-type: application/json

{
   "nextToken": "string",
   "retrievalConfiguration": { 
      "vectorSearchConfiguration": { 
         "filter": { ... },
         "numberOfResults": number,
         "overrideSearchType": "string"
      }
   },
   "retrievalQuery": { 
      "text": "string"
   }
}

URI Request Parameters

The request uses the following URI parameters.

knowledgeBaseId

The unique identifier of the knowledge base to query.

Length Constraints: Minimum length of 0. Maximum length of 10.

Pattern: ^[0-9a-zA-Z]+$

Required: Yes

Request Body

The request accepts the following data in JSON format.

nextToken

If there are more results than can fit in the response, the response returns a nextToken. Use this token in the nextToken field of another request to retrieve the next batch of results.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

Pattern: ^\S*$

Required: No

retrievalConfiguration

Contains configurations for the knowledge base query and retrieval process. For more information, see Query configurations.

Type: KnowledgeBaseRetrievalConfiguration object

Required: No

retrievalQuery

Contains the query to send the knowledge base.

Type: KnowledgeBaseQuery object

Required: Yes

Response Syntax


HTTP/1.1 200
Content-type: application/json

{
   "nextToken": "string",
   "retrievalResults": [ 
      { 
         "content": { 
            "text": "string"
         },
         "location": { 
            "s3Location": { 
               "uri": "string"
            },
            "type": "string"
         },
         "metadata": { 
            "string" : JSON value 
         },
         "score": number
      }
   ]
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

nextToken

If there are more results than can fit in the response, the response returns a nextToken. Use this token in the nextToken field of another request to retrieve the next batch of results.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

Pattern: ^\S*$

retrievalResults

A list of results from querying the knowledge base.

Type: Array of KnowledgeBaseRetrievalResult objects

Errors

For information about the errors that are common to all actions, see Common Errors.

AccessDeniedException

The request is denied because of missing access permissions. Check your permissions and retry your request.

HTTP Status Code: 403

BadGatewayException

There was an issue with a dependency due to a server issue. Retry your request.

HTTP Status Code: 502

ConflictException

There was a conflict performing an operation. Resolve the conflict and retry your request.

HTTP Status Code: 409

DependencyFailedException

There was an issue with a dependency. Check the resource configurations and retry the request.

HTTP Status Code: 424

InternalServerException

An internal server error occurred. Retry your request.

HTTP Status Code: 500

ResourceNotFoundException

The specified resource Amazon Resource Name (ARN) was not found. Check the Amazon Resource Name (ARN) and try your request again.

HTTP Status Code: 404

ServiceQuotaExceededException

The number of requests exceeds the service quota. Resubmit your request later.

HTTP Status Code: 400

ThrottlingException

The number of requests exceeds the limit. Resubmit your request later.

HTTP Status Code: 429

ValidationException

Input validation failed. Check your request parameters and retry the request.

HTTP Status Code: 400

Examples

Send a basic query

The following example queries a knowledge base.


POST /knowledgebases/KB12345678/retrieve HTTP/1.1
Content-type: application/json

{
    "retrievalQuery": {
        "text": "What is AWS?"
    }
}

Send a query and include filters

To include filters in a knowledge base query, at least one of the data source files must include a .metadata.json file. For example, if you had a data source of articles called articles.pdf, accompanied by a metadata file called articles.metadata.json, you could tag it for genre, year, and author. In the Retrieve request, you could apply the following filter to return all entertainment articles written after 2018, in addition to cooking or sports articles written by authors starting with C.


POST /knowledgebases/KB12345678/retrieve HTTP/1.1
Content-type: application/json

{
    "retrievalQuery": {
        "text": "What is AWS?",
    },
    "vectorSearchConfiguration": {
        "numberOfResults": 5,
        "filter": {
            "orAll": [
                {
                    "andAll": [
                        {
                            "equals": {
                                "key": "genre",
                                "value": "entertainment"
                            }
                        },
                        {
                            "greaterThan": {
                                "key": "year",
                                "value": 2018
                            }
                        }
                    ]
                },
                {
                    "andAll": [
                        {
                            "in": {
                                "key": "genre",
                                "value": ["cooking", "sports"]
                            }
                        },
                        {
                            "startsWith": {
                                "key": "author",
                                "value": "C"
                            }
                        }
                    ]
                }
            ]
        }
    }
}