How can I add HTTP request caching to an application using ASIHTTPRequests?

Question

I'm using ASIHttpRequests and an ASINetworkQueue in an iphone app to retrieve some 100k XML files and a lot of thumbnails from a web service. I'd like to cache the requests in the style of NSURLCache. ASI doesn't seem to support caching as is, and I looked at the code and it drops to C to create the requests, so inserting the NSURLCache layer seemed tricky.

What's the best way to implement this?

score 3 · Answer 1 · answered Jul 13 '11 at 10:52

3

ASIHTTPRequest now supports caching - check out ASIDownloadCache ie.

[ASIHTTPRequest setDefaultCache:[ASIDownloadCache sharedCache]]

answered Jul 13 '11 at 10:52

adam

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score 1 · Answer 2 · answered May 13 '10 at 17:12

You could provide your own caching before dropping down into ASI code.

Wrap your ASI code in a class that has a method:

-(NSString *)getContentFor:(NSURL *)url

That method first checks an internal NSDictionary to see if it has a key present for the specified url. If it does, it returns the object stored with the key.

If it doesn't, it performs the normal ASIRequest. When the request is received from the server, it stores it as a string in your dictionary with the key of the url.

Of course, you'll need to handle asynchronous requests and expiring of old requests with care.

score 1 · Answer 3 · answered May 16 '10 at 17:42

1

Anyone asking how they can do this with ASIHTTPRequest directly may be interested in this branch of the code that adds support for this feature as an option.

answered May 16 '10 at 17:42

jkp

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score 0 · Answer 4 · answered Mar 12 '10 at 04:31

NSURLConnection has support for caching in the style of NSURLCache, and it does a lot of work for you behind the scenes. It even has a nice delegate method that will allow you to manipulate the cachedResponse:

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse

score 0 · Answer 5 · answered Mar 08 '12 at 13:23

try this, it works for me.

__block ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setDownloadCache:[ASIDownloadCache sharedCache]];
    [request setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
   [request setCachePolicy:ASIAskServerIfModifiedWhenStaleCachePolicy];
   [request setSecondsToCache:60*60*24]; // Cache for 24 hrs
    [request setDelegate:self]; // A delegate must be specified
    [request setCompletionBlock:^{

How can I add HTTP request caching to an application using ASIHTTPRequests?

5 Answers5