Information About Sending Over 1500 Bytes on wget_post in the Spresense SDK

I noticed that I was trying to send a binary file by modifying sdk/system/netutils/webclient.c. If I try to send more than 1500 bytes of text (buffer), I try to send the buffer bytes properly for a few minutes.
The contents appear to be repeating the first 1500 bytes.

I understand that wget_base is not binary, so I copied wget_base and tried creating another function called wget_base_post_binary, but there seemed to be a problem with the original wget_base.

Specifically, the following parts may be the problem.

sdk/system/netutils/webclient.c:wget_base(FAR const char*url, FAR char*buffer, int buflen,
wget_callback_t callback, FAR void*arg,
FAR const char* posts, uint8_t mode)
of the

do
        {
          ret = https?tls_socket_write(sockfd, buffer, len)
                      : send(sockfd, buffer, len, 0);
          if(ret<0)
            {
              nerr("ERROR:send failed:%d\n", errno);
              goto errout;
            }
          len = len-ret;
        }
      while(len!=0);

That's the part, but

char*p_buffer=buffer;
      do
        {
          ret = https?tls_socket_write(sockfd, p_buffer, len)
                      : send(sockfd, p_buffer, len, 0);
          if(ret<0)
            {
              nerr("ERROR:send failed:%d\n", errno);
              goto errout;
            }
          p_buffer+=ret;
          len = len-ret;
        }
      while(len!=0);

I think it's necessary to write