//Json格式 
        
 
         
              [mtbRequset setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];  
         
 
          
              NSError *error;  
         
 
          
              NSData *body = [NSJSONSerialization dataWithJSONObject:bodyDict options:NSJSONWritingPrettyPrinted error:&error];  
         
 
          
              if (error) {  
         
 
          
                  MBErrorLog(@"%@", error);  
         
 
          
              } 
         
 
          
              mtbRequset.HTTPBody = body;  
         
 
         
         //x-www-form-urlencoded格式 
        
 
         
              NSString *bodyStr = @"type=shentong&postid=3333557693903";  
         
 
          
              mutablerequest.HTTPBody = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];  
         
 
          
              [mutablerequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];  
         
 
        