(Node.js) Fetch Web Pages from Local Cache

Demonstrates how to keep a local cache to avoid re-fetching web pages.

Note: This example requires Chilkat v9.5.0.91 or later.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var http = new chilkat.Http();

    // Define a cache directory and set the number of levels based on the anticipated size of the cache.
    http.AddCacheRoot("c:/AAWorkarea/httpCache/");

    // up to 256 sub-directories under the cache root will be created as needed to hold cached GET's.
    http.NumCacheLevels = 1;

    // Tell the http object to fetch from the cache if possible.
    http.FetchFromCache = true;

    // Also tell the http object to update the cache with newly fetched pages.
    http.UpdateCache = true;

    // This HTTP GET should result in a cache file getting created.
    var html = http.QuickGetStr("https://www.google.com/");
    if (http.LastMethodSuccess == false) {
        console.log(http.LastErrorText);
        return;
    }

    // The 1st GET was not from cache:
    console.log("Fetched from cache: " + http.LastFromCache);

    // Fetching again will cause the page to be delivered from our local cache.
    html = http.QuickGetStr("https://www.google.com/");
    if (http.LastMethodSuccess == false) {
        console.log(http.LastErrorText);
        return;
    }

    // The 2nd GET is from cache:
    console.log("Fetched from cache: " + http.LastFromCache);

}

chilkatExample();