React Native Requires Chilkat v11.0.0+

Get the Last-Modified Date Before HTTP Download

See more HTTP Examples

Demonstrates how to send a HEAD request to get the last-modified date of a file on a web server (without downloading the file). React Native

import { CkDateTime, DtObj, Http, HttpResponse } from '@chilkat/react-native'

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

  const http = new Http();

  const resp = new HttpResponse();
  try {
    await http.httpNoBodyAsync('HEAD', 'https://www.chilkatsoft.com/hamlet.xml', resp);
  } catch {
    console.log(http.lastErrorText);
    return;
  }

  // Examine the response header.
  console.log(resp.header);

  // Here is a sample response header:

  // 	Content-Length: 279658
  // 	Content-Type: text/xml
  // 	Last-Modified: Thu, 12 May 2016 15:14:08 GMT
  // 	Accept-Ranges: bytes
  // 	ETag: "c1cd8bee60acd11:0"
  // 	Server: Microsoft-IIS/8.5
  // 	X-Powered-By: ASP.NET
  // 	X-Powered-By-Plesk: PleskWin
  // 	Date: Thu, 25 Jul 2019 16:40:54 GMT

  // Get the Last-Modified header.
  // If the header exists...
  try {
    const lastModStr = resp.getHeaderField('Last-Modified');
    // Parse the RFC822 format date/time string
    const ckdt = new CkDateTime();
    ckdt.setFromRfc822(lastModStr);

    // If we want to access individual date/time parts (in the local timezone)
    const dt = new DtObj();
    ckdt.toDtObj(true, dt);

    console.log(`day/month/year = ${dt.day}/${dt.month}/${dt.year}`);
  } catch {
    // resp.getHeaderField() failed; continue anyway.
  }
}