NSString *photoHttpStr = @"https://aip.baidubce.com/rest/2.0/image-classify/v1/body_seg_photo";

    NSString *totalUrl = [NSString stringWithFormat:@"%@?access_token=%@",photoHttpStr,token];

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

    [manager.requestSerializer willChangeValueForKey:@"timeoutInterval"];

    manager.requestSerializer.timeoutInterval = 20.f;

    [manager.requestSerializer didChangeValueForKey:@"timeoutInterval"];

    AFHTTPRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];

    [requestSerializer setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

    manager.requestSerializer = requestSerializer;

    NSString *base64Str = [self base64WithImage:_myImage];

    NSString *imageValue = [self urlEncodeStr:base64Str];

    NSDictionary *param = @{@"image":imageValue};

    [manager POST:totalUrl parameters:param progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

        if (responseObject == nil) {

            return;

        }

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

    }];

一直返回input oversize,图片压缩的话就返回image not exist