Rust

Fetch Web Pages from Local Cache

See more HTTP Examples

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

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

let http = chilkat::Http::new();

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

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

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

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

// This HTTP GET should result in a cache file getting created.
let Ok(mut html) = http.quick_get_str("https://www.google.com/") else {
    println!("{}", http.last_error_text());
    return;
};

// The 1st GET was not from cache:
println!("Fetched from cache: {}", http.last_from_cache());

// Fetching again will cause the page to be delivered from our local cache.
html = http.quick_get_str("https://www.google.com/").unwrap_or_default();
if !http.last_method_success() {
    println!("{}", http.last_error_text());
    return;
}

// The 2nd GET is from cache:
println!("Fetched from cache: {}", http.last_from_cache());