how can i get a complete proxy content?

[pf shineyear]

hi

i try to get a complete proxy content  from a body filter like this:

struct ngx_chain_s *tmp_in = in;

while (tmp_in)
{
    len = tmp_in->buf->last - tmp_in->buf->pos;

    if (len <= 0)
    {
          if (tmp_in->next == NULL)break;

          tmp_in = tmp_in->next;
          continue;
    }

    // copy the buf to somewhere


    if (tmp_in->next == NULL)
    {
        break;
    }

    tmp_in = tmp_in->next;

}

if (tmp_in->buf->last_buf)
{
    //end of the buf
}

 i set proxy_buffering off; but when i want to get a more little bigger file
about 200KB

i always got len <= 0 buf , so can u tell me why ? and how to resolve that?
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