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@smithy/middleware-endpoint

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@smithy/middleware-endpoint

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What is @smithy/middleware-endpoint?

@smithy/middleware-endpoint is a middleware package for the AWS SDK for JavaScript (v3) that helps in resolving and customizing endpoints for service clients. It allows developers to modify endpoint resolution logic, making it easier to direct requests to different endpoints based on custom logic or configuration.

What are @smithy/middleware-endpoint's main functionalities?

Custom Endpoint Resolution

This feature allows you to customize the endpoint resolution logic. In this example, the middleware modifies the request's hostname to a custom endpoint before passing it to the next middleware in the stack.

const { EndpointMiddleware } = require('@smithy/middleware-endpoint');
const { HttpRequest } = require('@smithy/protocol-http');

const customEndpointMiddleware = (next, context) => async (args) => {
  const request = args.request;
  if (HttpRequest.isInstance(request)) {
    request.hostname = 'custom-endpoint.example.com';
  }
  return next({ ...args, request });
};

// Usage in a client configuration
const client = new SomeAWSClient({
  region: 'us-west-2',
  middlewareStack: [customEndpointMiddleware]
});

Conditional Endpoint Resolution

This feature allows you to conditionally resolve endpoints based on the operation being performed. In this example, the middleware changes the endpoint only for the 'GetItem' operation.

const { EndpointMiddleware } = require('@smithy/middleware-endpoint');
const { HttpRequest } = require('@smithy/protocol-http');

const conditionalEndpointMiddleware = (next, context) => async (args) => {
  const request = args.request;
  if (HttpRequest.isInstance(request) && context.operationName === 'GetItem') {
    request.hostname = 'get-item-endpoint.example.com';
  }
  return next({ ...args, request });
};

// Usage in a client configuration
const client = new SomeAWSClient({
  region: 'us-west-2',
  middlewareStack: [conditionalEndpointMiddleware]
});

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Package last updated on 30 Sep 2024

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