(C++) 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.

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#include <CkHttp.h>

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

    CkHttp 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.put_NumCacheLevels(1);

    // Tell the http object to fetch from the cache if possible.
    http.put_FetchFromCache(true);

    // Also tell the http object to update the cache with newly fetched pages.
    http.put_UpdateCache(true);

    // This HTTP GET should result in a cache file getting created.
    const char *html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    // The 1st GET was not from cache:
    std::cout << "Fetched from cache: " << http.get_LastFromCache() << "\r\n";

    // Fetching again will cause the page to be delivered from our local cache.
    html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    // The 2nd GET is from cache:
    std::cout << "Fetched from cache: " << http.get_LastFromCache() << "\r\n";
    }