NSURLSession请求 加gb2312编码

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需求是：请求的时候参数是汉字的进行gb2312编码，

最开始用的AF，AF默认是UTF-8编码

通过修改编码格式不行， AF最后提交的时候会进行2次编码，

1.jpg 2.jpg

最后用原生写解决

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NSStringEncoding encGbk = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
  //  NSString *retStr =name;
    NSString *retStr =  [name stringByAddingPercentEscapesUsingEncoding:encGbk];
    NSString * urls = @"";//地址
//    NSDictionary * dic = @{
//                           @"id_card":id_card,
//                           @"name":retStr,
//                           @"valCode":valCode,
//                           @"certificate_code":@"",
//                           @"evelop_code":@""
//                           };
    
    //certificate_code=&evelop_code=&id_card=&name=%E5%90%95%E6%85%A7%E5%BC%BA&valCode=4174
    
    NSString *body= [NSString stringWithFormat:@"certificate_code=%@&evelop_code=%@&id_card=%@&name=%@&valCode=%@",@"",@"",id_card,retStr,valCode];
    
    
    
    NSURLSession *session=[NSURLSession sharedSession];
    
    NSURL *url=[NSURL URLWithString:urls];
 
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    
    [request setValue:@"application/x-www-form-urlencoded;charset=gb2312" forHTTPHeaderField:@"Content-Type"];
    
    request.timeoutInterval = 180;
    [request setValue:@"iir.circ.gov.cn" forHTTPHeaderField:@"Host"];
    [request setValue:@"keep-alive" forHTTPHeaderField:@"Connection"];
    [request setValue:@"gzip,deflate" forHTTPHeaderField:@"Accept-Encoding"];
    [request setValue:@"zh-CN,zh;q=0.8" forHTTPHeaderField:@"Accept-Language"];
    [request setValue:@"" forHTTPHeaderField:@"Origin"];//
    [request setValue:@"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)" forHTTPHeaderField:@"User-Agent"];
    [request setValue:@"" forHTTPHeaderField:@"Referer"];//
    NSString * cookie =  [[NSUserDefaults standardUserDefaults] valueForKey:@"cookie"];
    NSLog(@"***********************cookie为 %@ *************************",cookie);
    [request setValue:cookie forHTTPHeaderField:@"Cookie"];
   
    [request setValue:@"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8" forHTTPHeaderField:@"Accept"];
    
   // request.acceptableContentTypes =  [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", @"text/css", @"text/xml", @"text/plain", @"application/javascript", @"image/*",@"application/json", nil];
    
    
   // request.HTTPBody = [[dic mj_JSONString] dataUsingEncoding:encGbk];
    
     request.HTTPBody = [body dataUsingEncoding:encGbk];
    NSString *str = [[NSString alloc] initWithData:request.HTTPBody encoding:encGbk];
    
    NSLog(@" ***********************请求参数***********************%@",str);
    
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error){
        
        
        if (error ==nil) {
            NSString *str = [[NSString alloc] initWithData:data encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];
            
            VMLog(@" ***********************请求成功***********************%@---------------error===%@",str,error);
            
        }else{
            
            VMLog(@"%@",error);
        }
        
    }];
    
    //7.执行任务
    [dataTask resume];