ASIHTTPRequest請求網頁數據

   NSString *summary=summaryURl;
    NSURL *urlStr=[NSURL URLWithString:summary];
    summaryRequest=[ASIFormDataRequest requestWithURL:urlStr];
    [summaryRequest setRequestMethod:@"POST"];
    [summaryRequest addRequestHeader:@"Content-Type" value:@"application/json"];
    summaryRequest.tag=ETSummaryRequestTag;;
    NSMutableDictionary *mutaDict=[NSMutableDictionary dictionary];
    [mutaDict setObject: [NSNumber numberWithInt:ShareApp.appUserId] forKey:@"user_id"];
    NSString *jsonString=[mutaDict JSONRepresentation];
    [summaryRequest appendPostData:[jsonString dataUsingEncoding:NSUTF8StringEncoding]];
    summaryRequest.delegate=self;
    [summaryRequest startAsynchronous];
   [UIApplication sharedApplication].networkActivityIndicatorVisible=YES;