/**

 * url:请求地址

 * verb:请求方式

 * parameters:请求参数

 */

+(NSString *)sendRequestTo:(NSURL *)url usingVerb:(NSString *)verb withParameters:(NSDictionary *)parameters{

    NSString *jsonStr = nil;

    NSData *body = nil;

    NSMutableString *params = nil;

    NSString *contentType = @"text/html; charset=utf-8";

    NSURL *finalURL = url;

    if(nil != parameters){

        params = [[NSMutableString alloc] init];

        for(id key in parameters){

            NSString *encodedkey = [key stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

            CFStringRef value = (CFStringRef)[[parameters objectForKey:key] copy];

            CFStringRef encodedValue = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, value,NULL,(CFStringRef)@";/?:@&=+$", kCFStringEncodingUTF8);

            [params appendFormat:@"%@=%@&", encodedkey, encodedValue];

            CFRelease(value);

            CFRelease(encodedValue);

        }

        [params deleteCharactersInRange:NSMakeRange([params length] - 1, 1)];

    }

    //

    if([verb isEqualToString:@"POST"]){

        contentType = @"application/x-www-form-urlencoded; charset=utf-8";

        body = [params dataUsingEncoding:NSUTF8StringEncoding];

    }else{

        if(nil != parameters){

            NSString *urlWithParams = [[url absoluteString] stringByAppendingFormat:@"?%@", params];

            finalURL = [NSURL URLWithString:urlWithParams];

        }

    }

    NSMutableDictionary *headers = [[[NSMutableDictionary alloc] init] autorelease];

    [headers setValue:contentType forKey:@"Content-Type"];

    [headers setValue:@"text/html" forKey:@"Accept"];

    [headers setValue:@"no-cache" forKey:@"Cache-Control"];

    [headers setValue:@"no-cache" forKey:@"Pragma"];

    [headers setValue:@"close" forKey:@"Connection"];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:finalURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];

    [request setHTTPMethod:verb];

    [request setAllHTTPHeaderFields:headers];

    if(nil != parameters){

        [request setHTTPBody:body];

    }

    [params release];

    //

    NSURLResponse *response;

    NSError *error = nil;

    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

    if(error){

        NSLog(@"something is wrong: %@", [error description]);

    }else{

        if(responseData){

            jsonStr = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];

        }

    }

    return  jsonStr;

}

+(void)testRequest{

    NSLog(@"test request...");

    NSString *getUrl = @"";

    NSString *postUrl = @"";

    NSMutableDictionary *dlist = [[NSMutableDictionary alloc] init];

    [dlist setObject:@"pig" forKey:@"uid"];

    [dlist setObject:@"access token" forKey:@"AccessToken"];

    [dlist setObject:@"access token secret" forKey:@"AccessTokenSecret"];

    NSString *jsonStrGet = [NetAPI sendRequestTo:[NSURL URLWithString:getUrl] usingVerb:@"GET" withParameters:dlist];

    NSLog(@"do get: jsonStrGet = %@", jsonStrGet);

    NSString *jsonStrPost = [NetAPI sendRequestTo:[NSURL URLWithString:postUrl] usingVerb:@"POST" withParameters:dlist];

    NSLog(@"do post: jsonStrPost = %@", jsonStrPost);

    [dlist release];

}