Lua

Fetch Web Pages from Local Cache

See more HTTP Examples

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

local chilkat = require("chilkat")

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

local 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.num_cache_levels = 1

-- Tell the http object to fetch from the cache if possible.
http.fetch_from_cache = true

-- Also tell the http object to update the cache with newly fetched pages.
http.update_cache = true

-- This HTTP GET should result in a cache file getting created.
local html = http:quick_get_str("https://www.google.com/")
if not http.last_method_success then
    print(http.last_error_text)
    return
end

-- The 1st GET was not from cache:
print("Fetched from cache: " .. tostring(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/")
if not http.last_method_success then
    print(http.last_error_text)
    return
end

-- The 2nd GET is from cache:
print("Fetched from cache: " .. tostring(http.last_from_cache))