iOS不依靠AFNetwork访问HTTP

iOS开发人员提到访问HTTP接口，好像不用AFNetwork就不是政治正确，但结合开发历程来看，其实好多时候，我们只是简单访问HTTP API接口，一个方法就搞定了，不用引用那么庞大的库，正应了那句，杀鸡何须用牛刀。

+(void)rawGet:(NSString*)url callback:(void (^)(int httpCode,NSString* response))callback{
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        NSURL *urlObj = [NSURL URLWithString:url];

        NSMutableURLRequest* request = [[NSMutableURLRequest alloc] init];
        request.URL = urlObj;
        request.HTTPMethod = @"GET";
        request.timeoutInterval = 10;

        int httpCode = 200;
        NSError* httpError = nil;
        NSURLResponse *response = nil;
        NSData *receivedData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&httpError];
        if(httpError){
            if(response != nil && [response isKindOfClass:[NSHTTPURLResponse class]]){
                NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
                httpCode = (int)httpResponse.statusCode;
            }else{
                httpCode = -1;
            }
        }

        if(callback){
            if(httpCode == 200){
                NSString* response = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];
                callback(httpCode,response);
            }else{
                callback(httpCode,nil);
            }
        }
    });
}