Create an IAM role and policy for the API to access Kinesis Start to create an API as a Kinesis proxy List streams in Kinesis Create, describe, and delete a stream in Kinesis Get records from and add records to a stream in Kinesis

Tutorial: Create a REST API as an Amazon Kinesis proxy in API Gateway

This page describes how to create and configure a REST API with an integration of the AWS type to access Kinesis.

Note

To integrate your API Gateway API with Kinesis, you must choose a region where both the API Gateway and Kinesis services are available. For region availability, see Service Endpoints and Quotas.

For the purpose of illustration, we create an example API to enable a client to do the following:

List the user's available streams in Kinesis
Create, describe, or delete a specified stream
Read data records from or write data records into the specified stream

To accomplish the preceding tasks, the API exposes methods on various resources to invoke the following, respectively:

The ListStreams action in Kinesis
The CreateStream, DescribeStream, or DeleteStream action
The GetRecords or PutRecords (including PutRecord) action in Kinesis

Specifically, we build the API as follows:

Expose an HTTP GET method on the API's /streams resource and integrate the method with the ListStreams action in Kinesis to list the streams in the caller's account.
Expose an HTTP POST method on the API's /streams/{stream-name} resource and integrate the method with the CreateStream action in Kinesis to create a named stream in the caller's account.
Expose an HTTP GET method on the API's /streams/{stream-name} resource and integrate the method with the DescribeStream action in Kinesis to describe a named stream in the caller's account.
Expose an HTTP DELETE method on the API's /streams/{stream-name} resource and integrate the method with the DeleteStream action in Kinesis to delete a stream in the caller's account.
Expose an HTTP PUT method on the API's /streams/{stream-name}/record resource and integrate the method with the PutRecord action in Kinesis. This enables the client to add a single data record to the named stream.
Expose an HTTP PUT method on the API's /streams/{stream-name}/records resource and integrate the method with the PutRecords action in Kinesis. This enables the client to add a list of data records to the named stream.
Expose an HTTP GET method on the API's /streams/{stream-name}/records resource and integrate the method with the GetRecords action in Kinesis. This enables the client to list data records in the named stream, with a specified shard iterator. A shard iterator specifies the shard position from which to start reading data records sequentially.
Expose an HTTP GET method on the API's /streams/{stream-name}/sharditerator resource and integrate the method with the GetShardIterator action in Kinesis. This helper method must be supplied to the ListStreams action in Kinesis.

You can apply the instructions presented here to other Kinesis actions. For the complete list of the Kinesis actions, see Amazon Kinesis API Reference.

Instead of using the API Gateway console to create the sample API, you can import the sample API into API Gateway using the API Gateway Import API. For information on how to use the Import API, see Configuring a REST API using OpenAPI.

If you do not have an AWS account, complete the following steps to create one.

To sign up for an AWS account

Open https://portal.aws.amazon.com/billing/signup.
Follow the online instructions.

Part of the sign-up procedure involves receiving a phone call and entering a verification code on the phone keypad.

Create an IAM role and policy for the API to access Kinesis

To allow the API to invoke Kinesis actions, you must have appropriate IAM policies attached to an IAM role. This section explains how to verify and to create, if necessary, the required IAM role and policies.

To enable read-only access to Kinesis, you can use the AmazonKinesisReadOnlyAccess policy that allows the Get*, List*, and Describe* actions in Kinesis to be invoked.



{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "kinesis:Get*",
                "kinesis:List*",
                "kinesis:Describe*"
            ],
            "Resource": "*"
        }
    ]
}

This policy is available as an IAM-provisioned managed policy and its ARN is arn:aws:iam::aws:policy/AmazonKinesisReadOnlyAccess.

To enable read-write actions in Kinesis, you can use the AmazonKinesisFullAccess policy.



{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "kinesis:*",
            "Resource": "*"
        }
    ]
}

This policy is also available as an IAM-provisioned managed policy. Its ARN is arn:aws:iam::aws:policy/AmazonKinesisFullAccess.

After you decide which IAM policy to use, attach it to a new or existing IAM role. Make sure that the API Gateway control service (apigateway.amazonaws.com) is a trusted entity of the role and is allowed to assume the execution role (sts:AssumeRole).



{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Service": "apigateway.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

If you create the execution role in the IAM console and choose the Amazon API Gateway role type, this trust policy is automatically attached.

Note the ARN of the execution role. You will need it when creating an API method and setting up its integration request.

Start to create an API as a Kinesis proxy

Use the following steps to create the API in the API Gateway console.

To create an API as an AWS service proxy for Kinesis

Sign in to the API Gateway console at https://console.aws.amazon.com/apigateway.
If this is your first time using API Gateway, you see a page that introduces you to the features of the service. Under REST API, choose Build. When the Create Example API popup appears, choose OK.

If this is not your first time using API Gateway, choose Create API. Under REST API, choose Build.
Choose New API.
In API name, enter KinesisProxy. Leave the default values in the other fields.
Enter a description in Description, if you like.
Choose Create API.

After the API is created, the API Gateway console displays the Resources page, which contains only the API's root (/) resource.

List streams in Kinesis

Kinesis supports the ListStreams action with the following REST API call:


POST /?Action=ListStreams HTTP/1.1
Host: kinesis.<region>.<domain>
Content-Length: <PayloadSizeBytes>
User-Agent: <UserAgentString>
Content-Type: application/x-amz-json-1.1
Authorization: <AuthParams>
X-Amz-Date: <Date>
        
{
   ...
}

In the above REST API request, the action is specified in the Action query parameter. Alternatively, you can specify the action in a X-Amz-Target header, instead:


POST / HTTP/1.1
Host: kinesis.<region>.<domain>
Content-Length: <PayloadSizeBytes>
User-Agent: <UserAgentString>
Content-Type: application/x-amz-json-1.1
Authorization: <AuthParams>
X-Amz-Date: <Date>
X-Amz-Target: Kinesis_20131202.ListStreams        
{
   ...
}

In this tutorial, we use the query parameter to specify action.

To expose a Kinesis action in the API, add a /streams resource to the API's root. Then set a GET method on the resource and integrate the method with the ListStreams action of Kinesis.

The following procedure describes how to list Kinesis streams by using the API Gateway console.

To list Kinesis streams by using the API Gateway console

Select the API root resource. In Actions, choose Create Resource.

In Resource Name, type Streams, leave Resource Path and other fields as the default, and choose Create Resource.
Choose the /Streams resource. From Actions, choose Create Method, choose GET from the list, and then choose the check mark icon to finish creating the method.

Note

The HTTP verb for a method invoked by a client may differ from the HTTP verb for an integration required by the backend. We chose GET here, because listing streams is intuitively a READ operation.
In the method's Setup pane, choose AWS Service.
1. For AWS Region, choose a region (e.g., us-east-1).
2. For AWS Service, choose Kinesis.
3. Leave AWS Subdomain blank.
4. For HTTP method, choose POST.
  
  Note
  
  We chose POST here because Kinesis requires that the ListStreams action be invoked with it.
5. For Action Type, choose Use action name.
6. For Action, type ListStreams.
7. For Execution role, type the ARN for your execution role.
8. Leave the default of Passthrough for Content Handling.
9. Choose Save to finish the initial setup of the method.
Still in the Integration Request pane, expand the HTTP Headers section:
1. Choose Add header.
2. In the Name column, type Content-Type.
3. In the Mapped from column, type 'application/x-amz-json-1.1'.
4. Choose the check mark icon to save the setting.
We used a request parameter mapping to set the Content-Type header to the static value of 'application/x-amz-json-1.1' to inform Kinesis that the input is of a specific version of JSON.
Expand the Body Mapping Templates section:
1. Choose Add mapping template.
2. For Content-Type, type application/json.
3. Choose the check mark icon to save the Content-Type setting. Choose Yes, secure this integration in Change passthrough behavior.
4. Type {} in the template editor.
5. Choose the Save button to save the mapping template.
The ListStreams request takes a payload of the following JSON format:
```
{
    "ExclusiveStartStreamName": "string",
    "Limit": number
}
                    
```
However, the properties are optional. To use the default values, we opted for an empty JSON payload here.
Test the GET method on the Streams resource to invoke the ListStreams action in Kinesis:

From the API Gateway console, select the /streams/GET entry from the Resources pane, choose the Test invocation option, and then choose Test.

If you already created two streams named "myStream" and "yourStream" in Kinesis, the successful test returns a 200 OK response containing the following payload:
```
{
     "HasMoreStreams": false,
     "StreamNames": [
         "myStream",
         "yourStream"
     ]
}            
                    
```

Create, describe, and delete a stream in Kinesis

Creating, describing, and deleting a stream in Kinesis involves making the following Kinesis REST API requests, respectively:



POST /?Action=CreateStream HTTP/1.1
Host: kinesis.region.domain
...
Content-Type: application/x-amz-json-1.1
Content-Length: PayloadSizeBytes

{
    "ShardCount": number,
    "StreamName": "string"
}



POST /?Action=DescribeStream HTTP/1.1
Host: kinesis.region.domain
...
Content-Type: application/x-amz-json-1.1
Content-Length: PayloadSizeBytes

{
    "ExclusiveStartShardId": "string",
    "Limit": number,
    "StreamName": "string"
}



POST /?Action=DeleteStream HTTP/1.1
Host: kinesis.region.domain
...
Content-Type: application/x-amz-json-1.1
Content-Length: PayloadSizeBytes

{
    "StreamName":"string"
}

We can build the API to accept the required input as a JSON payload of the method request and pass the payload through to the integration request. However, to provide more examples of data mapping between method and integration requests, and method and integration responses, we create our API somewhat differently.

We expose the GET, POST, and Delete HTTP methods on a to-be-named Stream resource. We use the {stream-name} path variable as the placeholder of the stream resource and integrate these API methods with the Kinesis' DescribeStream, CreateStream, and DeleteStream actions, respectively. We require that the client pass other input data as headers, query parameters, or the payload of a method request. We provide mapping templates to transform the data to the required integration request payload.

To configure and test the GET method on a stream resource

Create a child resource with the {stream-name} path variable under the previously created /streams resource.
Add the POST, GET, and DELETE HTTP verbs to this resource.

After the methods are created on the resource, the structure of the API looks like the following:
Set up the GET /streams/{stream-name} method to call the POST /?Action=DescribeStream action in Kinesis, as shown in the following.
Add the following Content-Type header mapping to the integration request:
```
Content-Type: 'x-amz-json-1.1'
```
The task follows the same procedure to set up the request parameter mapping for the GET /streams method.
Add the following body mapping template to map data from the GET /streams/{stream-name} method request to the POST /?Action=DescribeStream integration request:
```
{
    "StreamName": "$input.params('stream-name')"
}
```
This mapping template generates the required integration request payload for the DescribeStream action of Kinesis from the method request's stream-name path parameter value.

Test the GET /stream/{stream-name} method to invoke the DescribeStream action in Kinesis:

From the API Gateway console, select /streams/{stream-name}/GET in the Resources pane, choose Test to start testing, type the name of an existing Kinesis stream in the Path field for stream-name, and choose Test. If the test is successful, a 200 OK response is returned with a payload similar to the following:


{
  "StreamDescription": {
    "HasMoreShards": false,
    "RetentionPeriodHours": 24,
    "Shards": [
      {
        "HashKeyRange": {
          "EndingHashKey": "68056473384187692692674921486353642290",
          "StartingHashKey": "0"
        },
        "SequenceNumberRange": {
          "StartingSequenceNumber": "49559266461454070523309915164834022007924120923395850242"
        },
        "ShardId": "shardId-000000000000"
      },
      ...
      {
        "HashKeyRange": {
          "EndingHashKey": "340282366920938463463374607431768211455",
          "StartingHashKey": "272225893536750770770699685945414569164"
        },
        "SequenceNumberRange": {
          "StartingSequenceNumber": "49559266461543273504104037657400164881014714369419771970"
        },
        "ShardId": "shardId-000000000004"
      }
    ],
    "StreamARN": "arn:aws:kinesis:us-east-1:12345678901:stream/myStream",
    "StreamName": "myStream",
    "StreamStatus": "ACTIVE"
  }
}

After you deploy the API, you can make a REST request against this API method:



GET https://your-api-id.execute-api.region.amazonaws.com/stage/streams/myStream HTTP/1.1
Host: your-api-id.execute-api.region.amazonaws.com
Content-Type: application/json
Authorization: ...
X-Amz-Date: 20160323T194451Z

To configure and test the POST method on a stream resource

Set up the POST /streams/{stream-name} method to call POST /?Action=CreateStream action in Kinesis. The task follows the same procedure to set up the GET /streams/{stream-name} method provided that you replace the DescribeStream action by CreateStream.
Add the following Content-Type header mapping to the integration request:
```
Content-Type: 'x-amz-json-1.1'
```
The task follows the same procedure to set up the request parameter mapping for the GET /streams method.
Add the following body mapping template to map data from the POST /streams/{stream-name} method request to the POST /?Action=CreateStream integration request:
```
{
    "ShardCount": #if($input.path('$.ShardCount') == '') 5 #else $input.path('$.ShardCount') #end,
    "StreamName": "$input.params('stream-name')"
}
```
In the preceding mapping template, we set ShardCount to a fixed value of 5 if the client does not specify a value in the method request payload.
Test the POST /streams/{stream-name} method to create a named stream in Kinesis:

From the API Gateway console, select /streams/{stream-name}/POST in the Resources pane, choose Test to start testing, type the name of an existing Kinesis stream in Path for stream-name, and choose Test. If the test is successful, a 200 OK response is returned with no data.

After you deploy the API, you can also make a REST API request against the POST method on a Stream resource to invoke the CreateStream action in Kinesis:
```
POST https://your-api-id.execute-api.region.amazonaws.com/stage/streams/yourStream HTTP/1.1
Host: your-api-id.execute-api.region.amazonaws.com
Content-Type: application/json
Authorization: ...
X-Amz-Date: 20160323T194451Z

{ 
    "ShardCount": 5
}
                    
```

Configure and test the DELETE method on a stream resource

Set up the DELETE /streams/{stream-name} method to integrate with the POST /?Action=DeleteStream action in Kinesis. The task follows the same procedure to set up the GET /streams/{stream-name} method provided that you replace the DescribeStream action by DeleteStream.
Add the following Content-Type header mapping to the integration request:
```
Content-Type: 'x-amz-json-1.1'
```
The task follows the same procedure to set up the request parameter mapping for the GET /streams method.
Add the following body mapping template to map data from the DELETE /streams/{stream-name} method request to the corresponding integration request of POST /?Action=DeleteStream :
```
{
    "StreamName": "$input.params('stream-name')"
}
```
This mapping template generates the required input for the DELETE /streams/{stream-name} action from the client-supplied URL path name of stream-name.
Test the DELETE method to delete a named stream in Kinesis:

From the API Gateway console, select the /streams/{stream-name}/DELETE method node in the Resources pane, choose Test to start testing, type the name of an existing Kinesis stream in Path for stream-name, and choose Test. If the test is successful, a 200 OK response is returned with no data.

After you deploy the API, you can also make the following REST API request against the DELETE method on the Stream resource to call the DeleteStream action in Kinesis:
```
DELETE https://your-api-id.execute-api.region.amazonaws.com/stage/streams/yourStream HTTP/1.1
Host: your-api-id.execute-api.region.amazonaws.com
Content-Type: application/json
Authorization: ...
X-Amz-Date: 20160323T194451Z

{}
                    
```

Get records from and add records to a stream in Kinesis

After you create a stream in Kinesis, you can add data records to the stream and read the data from the stream. Adding data records involves calling the PutRecords or PutRecord action in Kinesis. The former adds multiple records whereas the latter adds a single record to the stream.



POST /?Action=PutRecords HTTP/1.1
Host: kinesis.region.domain
Authorization: AWS4-HMAC-SHA256 Credential=..., ...
...
Content-Type: application/x-amz-json-1.1
Content-Length: PayloadSizeBytes

{
    "Records": [
        {
            "Data": blob,
            "ExplicitHashKey": "string",
            "PartitionKey": "string"
        }
    ],
    "StreamName": "string"
}



POST /?Action=PutRecord HTTP/1.1
Host: kinesis.region.domain
Authorization: AWS4-HMAC-SHA256 Credential=..., ...
...
Content-Type: application/x-amz-json-1.1
Content-Length: PayloadSizeBytes

{
    "Data": blob,
    "ExplicitHashKey": "string",
    "PartitionKey": "string",
    "SequenceNumberForOrdering": "string",
    "StreamName": "string"
}

Here, StreamName identifies the target stream to add records. StreamName, Data, and PartitionKey are required input data. In our example, we use the default values for all of the optional input data and will not explicitly specify values for them in the input to the method request.

Reading data in Kinesis amounts to calling the GetRecords action:


POST /?Action=GetRecords HTTP/1.1
Host: kinesis.region.domain
Authorization: AWS4-HMAC-SHA256 Credential=..., ...
...
Content-Type: application/x-amz-json-1.1
Content-Length: PayloadSizeBytes

{
    "ShardIterator": "string",
    "Limit": number
}

Here, the source stream from which we are getting records is specified in the required ShardIterator value, as is shown in the following Kinesis action to obtain a shard iterator:



POST /?Action=GetShardIterator HTTP/1.1
Host: kinesis.region.domain
Authorization: AWS4-HMAC-SHA256 Credential=..., ...
...
Content-Type: application/x-amz-json-1.1
Content-Length: PayloadSizeBytes
                
{
    "ShardId": "string",
    "ShardIteratorType": "string",
    "StartingSequenceNumber": "string",
    "StreamName": "string"
}

For the GetRecords and PutRecords actions, we expose the GET and PUT methods, respectively, on a /records resource that is appended to a named stream resource (/{stream-name}). Similarly, we expose the PutRecord action as a PUT method on a /record resource.

Because the GetRecords action takes as input a ShardIterator value, which is obtained by calling the GetShardIterator helper action, we expose a GET helper method on a ShardIterator resource (/sharditerator).

The following figure shows the API structure of resources after the methods are created:

Create Records:GET|PUT|PUT|GET method for the API.

The following four procedures describe how to set up each of the methods, how to map data from the method requests to the integration requests, and how to test the methods.

To set up and test the PUT /streams/{stream-name}/record method to invoke PutRecord in Kinesis:

Set up the PUT method, as shown in the following:
Add the following request parameter mapping to set the Content-Type header to an AWS-compliant version of JSON in the integration request:
```
Content-Type: 'x-amz-json-1.1'
```
The task follows the same procedure to set up the request parameter mapping for the GET /streams method.
Add the following body mapping template to map data from the PUT /streams/{stream-name}/record method request to the corresponding integration request of POST /?Action=PutRecord :
```
{
    "StreamName": "$input.params('stream-name')",
    "Data": "$util.base64Encode($input.json('$.Data'))",
    "PartitionKey": "$input.path('$.PartitionKey')"
}
```
This mapping template assumes that the method request payload is of the following format:
```
{
   "Data": "some data",
   "PartitionKey": "some key"
}
```
This data can be modeled by the following JSON schema:
```
{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "PutRecord proxy single-record payload",
  "type": "object",
  "properties": {
      "Data": { "type": "string" },
      "PartitionKey": { "type": "string" }
  }
}
```
You can create a model to include this schema and use the model to facilitate generating the mapping template. However, you can generate a mapping template without using any model.
To test the PUT /streams/{stream-name}/record method, set the stream-name path variable to the name of an existing stream, supply a payload of the required format, and then submit the method request. The successful result is a 200 OK response with a payload of the following format:
```
{
  "SequenceNumber": "49559409944537880850133345460169886593573102115167928386",
  "ShardId": "shardId-000000000004"
}
                    
```

To set up and test the PUT /streams/{stream-name}/records method to invoke PutRecords in Kinesis

Set up the PUT /streams/{stream-name}/records method, as shown in the following:
Add the following request parameter mapping to set the Content-Type header to an AWS-compliant version of JSON in the integration request:
```
Content-Type: 'x-amz-json-1.1'
```
The task follows the same procedure to set up the request parameter mapping for the GET /streams method.
Add the following body mapping template to map data from the PUT /streams/{stream-name}/records method request to the corresponding integration request of POST /?Action=PutRecords :
```
{
    "StreamName": "$input.params('stream-name')",
    "Records": [
       #foreach($elem in $input.path('$.records'))
          {
            "Data": "$util.base64Encode($elem.data)",
            "PartitionKey": "$elem.partition-key"
          }#if($foreach.hasNext),#end
        #end
    ]
}
```
This mapping template assumes that the method request payload can be modelled by the following JSON schema:
```
{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "PutRecords proxy payload data",
  "type": "object",
  "properties": {
    "records": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "data": { "type": "string" },
          "partition-key": { "type": "string" }
        }
      }
    }
  }
}
```
You can create a model to include this schema and use the model to facilitate generating the mapping template. However, you can generate a mapping template without using any model.

In this tutorial, we used two slightly different payload formats to illustrate that an API developer can choose to expose the backend data format to the client or hide it from the client. One format is for the PUT /streams/{stream-name}/records method (above). Another format is used for the PUT /streams/{stream-name}/record method (in the previous procedure). In production environment, you should keep both formats consistent.

To test the PUT /streams/{stream-name}/records method, set the stream-name path variable to an existing stream, supply the following payload, and submit the method request.



{
    "records": [
        {
            "data": "some data",
            "partition-key": "some key"
        },
        {
            "data": "some other data",
            "partition-key": "some key"
        }
    ]
}

The successful result is a 200 OK response with a payload similar to the following output:


{
  "FailedRecordCount": 0,
  "Records": [
    {
      "SequenceNumber": "49559409944537880850133345460167468741933742152373764162",
      "ShardId": "shardId-000000000004"
    },
    {
      "SequenceNumber": "49559409944537880850133345460168677667753356781548470338",
      "ShardId": "shardId-000000000004"
    }
  ]
}

To set up and test the GET /streams/{stream-name}/sharditerator method invoke GetShardIterator in Kinesis

The GET /streams/{stream-name}/sharditerator method is a helper method to acquire a required shard iterator before calling the GET /streams/{stream-name}/records method.

Set up integration for the GET /streams/{stream-name}/sharditerator method, as shown in the following:
The GetShardIterator action requires an input of a ShardId value. To pass a client-supplied ShardId value, we add a shard-id query parameter to the method request, as shown in the following:

In the following body-mapping template, we set the shard-id query parameter value to the ShardId property value of the JSON payload as the input to the GetShardIterator action in Kinesis.
Configure the body mapping template to generate the required input (ShardId and StreamName) to the GetShardIterator action from the shard-id and stream-name parameters of the method request. In addition, the mapping template also sets ShardIteratorType to TRIM_HORIZON as a default.
```
{
    "ShardId": "$input.params('shard-id')",
    "ShardIteratorType": "TRIM_HORIZON",
    "StreamName": "$input.params('stream-name')"
}
```
Using the Test option in the API Gateway console, enter an existing stream name as the stream-name Path variable value, set the shard-id Query string to an existing ShardId value (e.g., shard-000000000004), and choose Test.

The successful response payload is similar to the following output:
```
{
  "ShardIterator": "AAAAAAAAAAFYVN3VlFy..."
}
```
Make note of the ShardIterator value. You need it to get records from a stream.

To configure and test the GET /streams/{stream-name}/records method to invoke the GetRecords action in Kinesis

Set up the GET /streams/{stream-name}/records method, as shown in the following:
The GetRecords action requires an input of a ShardIterator value. To pass a client-supplied ShardIterator value, we add a Shard-Iterator header parameter to the method request, as shown in the following:
Set up the following mapping template to map the Shard-Iterator header parameter value to the ShardIterator property value of the JSON payload for the GetRecords action in Kinesis.
```
{
    "ShardIterator": "$input.params('Shard-Iterator')"
}
```
Using the Test option in the API Gateway console, type an existing stream name as the stream-name Path variable value, set the Shard-Iterator Header to the ShardIterator value obtained from the test run of the GET /streams/{stream-name}/sharditerator method (above), and choose Test.

The successful response payload is similar to the following output:
```
{
  "MillisBehindLatest": 0,
  "NextShardIterator": "AAAAAAAAAAF...",
  "Records": [ ... ]
}
```

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Document Conventions

OpenAPI definitions of a sample API as an Amazon S3 proxy

OpenAPI definitions of a sample API as a Kinesis proxy