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    <p>So, I found the solution.</p> <p>The idea is to use <code>connection:willCacheResponse:</code> method. Before cache the response it will be executed and there we can change response and return new, or return nil and the response will not be cached. As I use AFNetworking, there is a nice method in operation:</p> <pre><code>- (void)setCacheResponseBlock:(NSCachedURLResponse * (^)(NSURLConnection *connection, NSCachedURLResponse *cachedResponse))block; </code></pre> <p>Add code:</p> <pre><code> [operation setCacheResponseBlock:^NSCachedURLResponse *(NSURLConnection *connection, NSCachedURLResponse *cachedResponse) { if([connection currentRequest].cachePolicy == NSURLRequestUseProtocolCachePolicy) { cachedResponse = [cachedResponse responseWithExpirationDuration:60]; } return cachedResponse; }]; </code></pre> <p>Where <code>responseWithExpirationDuration</code> from category:</p> <pre><code>@interface NSCachedURLResponse (Expiration) -(NSCachedURLResponse*)responseWithExpirationDuration:(int)duration; @end @implementation NSCachedURLResponse (Expiration) -(NSCachedURLResponse*)responseWithExpirationDuration:(int)duration { NSCachedURLResponse* cachedResponse = self; NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)[cachedResponse response]; NSDictionary *headers = [httpResponse allHeaderFields]; NSMutableDictionary* newHeaders = [headers mutableCopy]; newHeaders[@"Cache-Control"] = [NSString stringWithFormat:@"max-age=%i", duration]; [newHeaders removeObjectForKey:@"Expires"]; [newHeaders removeObjectForKey:@"s-maxage"]; NSHTTPURLResponse* newResponse = [[NSHTTPURLResponse alloc] initWithURL:httpResponse.URL statusCode:httpResponse.statusCode HTTPVersion:@"HTTP/1.1" headerFields:newHeaders]; cachedResponse = [[NSCachedURLResponse alloc] initWithResponse:newResponse data:[cachedResponse.data mutableCopy] userInfo:newHeaders storagePolicy:cachedResponse.storagePolicy]; return cachedResponse; } @end </code></pre> <p>So, we set expiration in seconds in http header according to <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html">http/1.1</a> For that we need one of headers to be set up: Expires, Cache-Control: s-maxage or max-age Then create new cache response, because the properties is read only, and return new object.</p>
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    1. POHow to set NSURLRequest cache expiration?
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    1. COExactly what I was looking for! Thanks
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