@smithy/middleware-content-length

What is @smithy/middleware-content-length?

@smithy/middleware-content-length is a middleware package for the Smithy client framework. It is used to automatically calculate and set the Content-Length header for HTTP requests. This is particularly useful when dealing with payloads where the size needs to be explicitly defined.

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

Automatic Content-Length Calculation

This feature automatically calculates the Content-Length of the request body and sets it in the HTTP headers. This is useful for ensuring that the server knows the size of the incoming request payload.

const { ContentLengthMiddleware } = require('@smithy/middleware-content-length');
const { HttpRequest } = require('@smithy/protocol-http');

const request = new HttpRequest({
  hostname: 'example.com',
  method: 'POST',
  body: JSON.stringify({ key: 'value' })
});

const middleware = ContentLengthMiddleware();
const handler = middleware((next) => async (args) => {
  return next(args);
});

handler({ request }).then((response) => {
  console.log(response.request.headers['Content-Length']); // Outputs the calculated Content-Length
});

Other packages similar to @smithy/middleware-content-length

axios

Axios is a popular HTTP client for Node.js and the browser. It automatically sets the Content-Length header for POST requests with a body. However, it is a full-fledged HTTP client and not just middleware.

request

The request package is another HTTP client for Node.js that automatically handles the Content-Length header for requests with a body. Like axios, it is a complete HTTP client and not just middleware.

node-fetch

Node-fetch is a lightweight module that brings window.fetch to Node.js. It also automatically sets the Content-Length header for requests with a body. It is more lightweight compared to axios and request.

README

@smithy/middleware-content-length