# View

The `View` action retrieves a single document and returns it in the response of the request.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`ConnectorGroup` | The name of the connector group to send the request to. This must match the name you specified when you configured the ConnectorGroupRouter processor in your dataflow. | Yes
`Document` | The identifier of the document to return. | Yes
Custom parameters | Any other parameters that you set are added to the FlowFile, created by the HandleAciRequest processor, that represents the action. When a connector processes the action, it adds the parameters to any FlowFiles that it generates. The parameters are added as FlowFile attributes named `idol.aci.param.name`, where `name` is the name of the parameter that you set. FlowFile attributes can be referenced by processor properties that support expression language, and can be read by Lua scripts. You can therefore set custom parameters to customize processing within NiFi. The maximum size for a custom parameter value is 4KB. | No

## Example

    http://host:10000/action=View
                           &ConnectorGroup=FileSystem
                           &Document=...

## Response

The following XML shows an example response:

    <autnresponse>
        <action>VIEW</action>
        <response>SUCCESS</response>
        <responsedata>
            <reference>/opt/files/spreadsheet.xlsx</reference>
            <metadata>
                <FILESIZE>7523</FILESIZE>
                <LASTACCESSED>1568302040</LASTACCESSED>
                <LASTCHANGED>1568299154</LASTCHANGED>
                <LASTMODIFIED>1568299062</LASTMODIFIED>
            </metadata>
            <mime-type>application/octet-stream</mime-type>
            <filename>spreadsheet.xlsx</filename>
            <content>base64_encoded_file_content</content>
        </responsedata>
    </autnresponse>

The response includes the following elements:

- `reference` provides the document reference.
- `metadata` provides the metadata associated with the requested document. This is metadata available directly from the repository, not metadata extracted by KeyView.
- `page` elements (zero or more) provide text content, if the repository stores text alongside the document.
- `content` provides the file content, base-64 encoded.

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