用curl请求尝试下载ubuntu18.04，报错，错误码：23，具体信息如下：

E:\C_ProgramSpace\Chapter16\cmake-build-debug-mingw\bin\downloader.exe
HTTP/1.1 200 OK

Date: Sun, 09 Apr 2023 09:08:31 GMT

Server: Apache/2.4.29 (Ubuntu)

Last-Modified: Wed, 15 Sep 2021 20:42:31 GMT

ETag: “95da8000-5cc0ebcbeba61”

Accept-Ranges: bytes

Content-Length: 2514124800

Content-Type: application/x-iso9660-image

[Thread-14364] (http_manager.c:86) RetrieveOutputNameFromUrl: decode filename: ubuntu-18.04.6-desktop-amd64.iso
[Thread-14364] (http_manager.c:143) CurlBodyFunction: Fail to open file: //ubuntu-18.04.6-desktop-amd64.iso
[Thread-14364] (main.c:56) OnProgress: 16384/2514124800
[Thread-14364] (main.c:64) OnError: error: 23 Failed writing received data to disk/application

Process finished with exit code 0

代码如下：
/**

• 处理请求体

• @param buffer

• @param size

• @param nitems

• @param request_context

• @return
  */
  size_t CurlBodyFunction(char *buffer, size_t size, size_t nitems, RequestContext *request_context) {
  //判断文件是否打开
  if (!request_context->output_stream) {
  if (!request_context->output_filename) {
  RetrieveOutputNameFromUrl(request_context);
  }
  }

  if (request_context->output_filename) {
  curl_easy_getinfo(request_context->curl, CURLINFO_RESPONSE_CODE, &request_context->response_code);

   if (request_context->response_code == 206) {
       request_context->output_stream = SmartFOpenFileInDirectory(
           request_context->download_directory,
           request_context->output_filename,
           "ab");
   } else {
       request_context->output_stream = SmartFOpenFileInDirectory(
           request_context->download_directory,
           request_context->output_filename,
           "wb");
   }
   /**打印错误信息**/
   if (!request_context->output_stream) {
       PRINTLNF("Fail to open file: %s/%s",
                request_context->download_directory,
                request_context->output_filename);
       return -1;
   }
  

  } else {
  return -1;
  }

  if (request_context->output_stream) {
  fwrite(buffer, size, nitems, request_context->output_stream);
  }

  return size * nitems;
  }

/**
测试程序
**
static void TestHttp() {
Request request = {
.progress_callback = OnProgress,
.error_callback = OnError,
.success_callback = OnSuccess
};

RequestContext *context = CreateRequestContext(&request,
                                               "https://releases.ubuntu.com/bionic/ubuntu-18.04.6-desktop-amd64.iso",
                                               "/");
SendRequest(context);

if (context->curl_code == CURLE_OK) {
    request.success_callback(request.receiver, "OK");
} else {
    request.error_callback(request.receiver, context->curl_code, curl_easy_strerror(context->curl_code));
}

DestroyRequestContext(context);

}