Zig

Fetch Web Pages from Local Cache

See more HTTP Examples

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

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const http = try chilkat.Http.init();
    defer http.deinit();

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

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

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

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

    // This HTTP GET should result in a cache file getting created.
    var html: [:0]const u8 = http.quickGetStr(alloc, "https://www.google.com/") catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // The 1st GET was not from cache:
    std.debug.print("Fetched from cache: {}\n", .{http.getLastFromCache()});

    // Fetching again will cause the page to be delivered from our local cache.
    html = http.quickGetStr(alloc, "https://www.google.com/") catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // The 2nd GET is from cache:
    std.debug.print("Fetched from cache: {}\n", .{http.getLastFromCache()});
}