Dart Requires Chilkat v11.0.0+

Get Size of File on Web Server

See more HTTP Examples

Demonstrates how to send a HEAD request to fetch information about a file on a web server, which hopefully includes the Content-Length in the response header. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final http = CkHttp();

  final resp = CkHttpResponse();
  try {
    http.httpNoBody('HEAD', 'https://nodejs.org/dist/v10.16.1/node-v10.16.1-win-x64.zip', resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Examine the response header.
  print(resp.header);

  // Here is a sample response header:

  // Date: Thu, 01 Aug 2019 12:47:27 GMT
  // Content-Type: application/zip
  // Content-Length: 17457922
  // Connection: keep-alive
  // Set-Cookie: __cfduid=da5b78dcdd8171683c5a578eb9c9f88c81564663647; expires=Fri, 31-Jul-20 12:47:27 GMT; path=/; domain=.nodejs.org; HttpOnly
  // Last-Modified: Wed, 31 Jul 2019 18:21:57 GMT
  // ETag: "5d41dc45-10a6302"
  // Accept-Ranges: bytes
  // Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
  // Server: cloudflare
  // CF-RAY: 4ff7ebb32ac4e1e2-ORD

  // Get the Content-Length header.
  // If the header exists...
  try {
    final contentLengthStr = resp.getHeaderField('Content-Length');
    print('Content-Length: $contentLengthStr');
    // Your application can convert the contentLengthStr to an integer and then use it....
  } on ChilkatException {
    // resp.getHeaderField() failed; continue anyway.
  }
}