我正在字符串中使用etag来缓存我的图像,第一次它像应该的那样下载所有图像,但第二次它也这样做了,因为它应该进入304的失败块。
我试着从外部提出请求,我得到了304,就像我应该得到的一样,只是在AFNetworking方面,我遇到了的问题
NSString *urlString = [API_BASE_URL_PHOTOS stringByAppendingPathComponent:[photo getPathToPhoto]];
NSString *properlyEscapedURL = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:properlyEscapedURL];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
if ([UserDefaultManager getEtagForKey:photo.nom] != nil) {
[request setValue:[UserDefaultManager getEtagForKey:photo.nom] forHTTPHeaderField:ETAG_IF_NONE_MATCH];
}
[request setHTTPMethod:API_METHOD_GET];
AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:request imageProcessingBlock:nil
success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
[FileUtils createDirectoryInDocumentsWithFileName:photo.folderName];
NSString *docPath = [FileUtils getPathInDocumentsWithFileName:[photo getPathToPhoto]];
// Save Image
NSData *imageData = UIImageJPEGRepresentation(image, 90);
[imageData writeToFile:docPath atomically:YES];
if ([response respondsToSelector:@selector(allHeaderFields)]) {
NSDictionary *allHeaderFields = [response allHeaderFields];
[UserDefaultManager setEtag:[allHeaderFields objectForKey:ETAG] forKey:photo.nom];
}
if ([[DownloadManager sharedManager].downloadQueue.operations count] == 0) {
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_DOWNLOAD_ALL_PHOTOS_FINISHED object:nil];
}
}
failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
if (response.statusCode != RESPONSE_CODE_PHOTO_UP_TO_DATE) {
LogDebug(@"%@", [error localizedDescription]);
}
}];
我设法通过将请求更改为来解决此问题
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]
cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
timeoutInterval:60];
希望这能帮助