@smithy/middleware-content-length

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
});