VB.NET

Fetch Web Pages from Local Cache

See more HTTP Examples

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

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

Dim http As New Chilkat.Http

' 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.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.
Dim html As String = http.QuickGetStr("https://www.google.com/")
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' The 1st GET was not from cache:
Debug.WriteLine("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) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' The 2nd GET is from cache:
Debug.WriteLine("Fetched from cache: " & http.LastFromCache)