A load balancer distributes incoming traffic across targets, such as your EC2 instances.\nThis enables you to increase the availability of your application. The load balancer also\nmonitors the health of its registered targets and ensures that it routes traffic only to\nhealthy targets. You configure your load balancer to accept incoming traffic by specifying one\nor more listeners, which are configured with a protocol and port number for connections from\nclients to the load balancer. You configure a target group with a protocol and port number for\nconnections from the load balancer to the targets, and with health check settings to be used\nwhen checking the health status of the targets.
\nElastic Load Balancing supports the following types of load balancers: Application Load\nBalancers, Network Load Balancers, Gateway Load Balancers, and Classic Load Balancers. This\nreference covers the following load balancer types:
\nApplication Load Balancer - Operates at the application layer (layer 7) and supports\nHTTP and HTTPS.
\nNetwork Load Balancer - Operates at the transport layer (layer 4) and supports TCP,\nTLS, UDP, and QUIC.
\nGateway Load Balancer - Operates at the network layer (layer 3).
\nFor more information, see the Elastic Load Balancing User\nGuide.
\nAll Elastic Load Balancing operations are idempotent, which means that they complete at\nmost one time. If you repeat an operation, it succeeds.
\n\n## Installing\n\nTo install this package, use the CLI of your favorite package manager:\n\n- `npm install @aws-sdk/client-elastic-load-balancing-v2`\n- `yarn add @aws-sdk/client-elastic-load-balancing-v2`\n- `pnpm add @aws-sdk/client-elastic-load-balancing-v2`\n\n## Getting Started\n\n### Import\n\nThe AWS SDK is modulized by clients and commands.\nTo send a request, you only need to import the `ElasticLoadBalancingV2Client` and\nthe commands you need, for example `DescribeListenersCommand`:\n\n```js\n// ES5 example\nconst { ElasticLoadBalancingV2Client, DescribeListenersCommand } = require(\"@aws-sdk/client-elastic-load-balancing-v2\");\n```\n\n```ts\n// ES6+ example\nimport { ElasticLoadBalancingV2Client, DescribeListenersCommand } from \"@aws-sdk/client-elastic-load-balancing-v2\";\n```\n\n### Usage\n\nTo send a request:\n\n- Instantiate a client with configuration (e.g. credentials, region).\n - See [docs/CLIENTS](https://github.com/aws/aws-sdk-js-v3/blob/main/supplemental-docs/CLIENTS.md) for configuration details.\n - See [@aws-sdk/config](https://github.com/aws/aws-sdk-js-v3/blob/main/packages/config/README.md) for additional options.\n- Instantiate a command with input parameters.\n- Call the `send` operation on the client, providing the command object as input.\n\n```js\nconst client = new ElasticLoadBalancingV2Client({ region: \"REGION\" });\n\nconst params = { /** input parameters */ };\nconst command = new DescribeListenersCommand(params);\n```\n\n#### Async/await\n\nWe recommend using the [await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await)\noperator to wait for the promise returned by send operation as follows:\n\n```js\n// async/await.\ntry {\n const data = await client.send(command);\n // process data.\n} catch (error) {\n // error handling.\n} finally {\n // finally.\n}\n```\n\n#### Promises\n\nYou can also use [Promise chaining](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises#chaining).\n\n```js\nclient\n .send(command)\n .then((data) => {\n // process data.\n })\n .catch((error) => {\n // error handling.\n })\n .finally(() => {\n // finally.\n });\n```\n\n#### Aggregated client\n\nThe aggregated client class is exported from the same package, but without the \"Client\" suffix.\n\n`ElasticLoadBalancingV2` extends `ElasticLoadBalancingV2Client` and additionally supports all operations, waiters, and paginators as methods.\nThis style may be familiar to you from the AWS SDK for JavaScript v2.\n\nIf you are bundling the AWS SDK, we recommend using only the bare-bones client (`ElasticLoadBalancingV2Client`).\nMore details are in the blog post on\n[modular packages in AWS SDK for JavaScript](https://aws.amazon.com/blogs/developer/modular-packages-in-aws-sdk-for-javascript/).\n\n```ts\nimport { ElasticLoadBalancingV2 } from \"@aws-sdk/client-elastic-load-balancing-v2\";\n\nconst client = new ElasticLoadBalancingV2({ region: \"REGION\" });\n\n// async/await.\ntry {\n const data = await client.describeListeners(params);\n // process data.\n} catch (error) {\n // error handling.\n}\n\n// Promises.\nclient\n .describeListeners(params)\n .then((data) => {\n // process data.\n })\n .catch((error) => {\n // error handling.\n });\n\n// callbacks (not recommended).\nclient.describeListeners(params, (err, data) => {\n // process err and data.\n});\n```\n\n### Troubleshooting\n\nWhen the service returns an exception, the error will include the exception information,\nas well as response metadata (e.g. request id).\n\n```js\ntry {\n const data = await client.send(command);\n // process data.\n} catch (error) {\n const { requestId, cfId, extendedRequestId } = error.$metadata;\n console.log({ requestId, cfId, extendedRequestId });\n /**\n * The keys within exceptions are also parsed.\n * You can access them by specifying exception names:\n * if (error.name === 'SomeServiceException') {\n * const value = error.specialKeyInException;\n * }\n */\n}\n```\n\nSee also [docs/ERROR_HANDLING](https://github.com/aws/aws-sdk-js-v3/blob/main/supplemental-docs/ERROR_HANDLING.md).\n\n## Getting Help\n\nPlease use these community resources for getting help.\nWe use GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.\n\n- Visit the [Developer Guide](https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/welcome.html)\n or [API Reference](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/index.html).\n- Check out the blog posts tagged with [`aws-sdk-js`](https://aws.amazon.com/blogs/developer/tag/aws-sdk-js/)\n on AWS Developer Blog.\n- Ask a question on [StackOverflow](https://stackoverflow.com/questions/tagged/aws-sdk-js) and tag it with `aws-sdk-js`.\n- Join the AWS JavaScript community on [gitter](https://gitter.im/aws/aws-sdk-js-v3).\n- If it turns out that you may have found a bug, please [open an issue](https://github.com/aws/aws-sdk-js-v3/issues/new/choose).\n\nTo test your universal JavaScript code in Node.js, browser and react-native environments,\nvisit our [code samples repo](https://github.com/aws-samples/aws-sdk-js-tests).\n\n## Contributing\n\nThis client code is generated automatically. Any modifications will be overwritten the next time the `@aws-sdk/client-elastic-load-balancing-v2` package is updated.\nTo contribute to client you can check our [generate clients scripts](https://github.com/aws/aws-sdk-js-v3/tree/main/scripts/generate-clients).\n\n## License\n\nThis SDK is distributed under the\n[Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0),\nsee LICENSE for more information.\n\n## Client Commands (Operations List)\n\n