@aws-sdk/middleware-expect-continue

What is @aws-sdk/middleware-expect-continue?

@aws-sdk/middleware-expect-continue is a middleware package for the AWS SDK for JavaScript. It is used to handle the 'Expect: 100-continue' HTTP header, which allows a client to check if the server is willing to accept a request before actually sending the request body. This can be useful for optimizing network usage and improving performance when sending large payloads.

What are @aws-sdk/middleware-expect-continue's main functionalities?

Adding Expect-Continue Middleware

This feature allows you to add the Expect-Continue middleware to an AWS SDK client. The middleware is added to the client's middleware stack at the 'build' step with high priority.

const { S3Client } = require('@aws-sdk/client-s3');
const { expectContinueMiddleware } = require('@aws-sdk/middleware-expect-continue');

const client = new S3Client({});
client.middlewareStack.add(expectContinueMiddleware(), {
  step: 'build',
  priority: 'high',
});

Customizing Expect-Continue Middleware

This feature allows you to customize the Expect-Continue middleware by setting options such as the continue timeout. In this example, the continue timeout is set to 3000 milliseconds.

const { S3Client } = require('@aws-sdk/client-s3');
const { expectContinueMiddleware } = require('@aws-sdk/middleware-expect-continue');

const client = new S3Client({});
client.middlewareStack.add(expectContinueMiddleware({
  continueTimeout: 3000 // Custom timeout in milliseconds
}), {
  step: 'build',
  priority: 'high',
});

Other packages similar to @aws-sdk/middleware-expect-continue

axios

Axios is a popular HTTP client for Node.js and the browser. It supports the 'Expect: 100-continue' header through its configuration options. Compared to @aws-sdk/middleware-expect-continue, Axios is a more general-purpose HTTP client and can be used for a wide range of HTTP requests, not just those related to AWS services.

request

Request is another widely-used HTTP client for Node.js that supports the 'Expect: 100-continue' header. It provides a simple and easy-to-use API for making HTTP requests. While Request is more general-purpose, @aws-sdk/middleware-expect-continue is specifically designed to work with the AWS SDK for JavaScript.

README

@aws-sdk/middleware-expect-continue

Changelog

3.208.0 (2022-11-10)

Bug Fixes

• aws-client-api-test: rename package (#4165) (2e13b67)
• types: add client config interface test with s3 example (#4156) (7811cd9)

Features

• client-ec2: This release adds a new price capacity optimized allocation strategy for Spot Instances to help customers optimize provisioning of Spot Instances via EC2 Auto Scaling, EC2 Fleet, and Spot Fleet. It allocates Spot Instances based on both spare capacity availability and Spot Instance price. (6f4d604)
• client-ecs: This release adds support for task scale-in protection with updateTaskProtection and getTaskProtection APIs. UpdateTaskProtection API can be used to protect a service managed task from being terminated by scale-in events and getTaskProtection API to get the scale-in protection status of a task. (a5eede0)
• client-elasticsearch-service: Amazon OpenSearch Service now offers managed VPC endpoints to connect to your Amazon OpenSearch Service VPC-enabled domain in a Virtual Private Cloud (VPC). This feature allows you to privately access OpenSearch Service domain without using public IPs or requiring traffic to traverse the Internet. (f36b021)
• client-scheduler: AWS introduces the new Amazon EventBridge Scheduler. EventBridge Scheduler is a serverless scheduler that allows you to create, run, and manage tasks from one central, managed service. (8829f71)
• clients: update client endpoints as of 2022-11-10 (c01499d)
• private: add server artifacts (#4159) (e70f472)