斯宾纳用浏览器下载了一个零字节的.jpg文件.下载(url，文件名)- Python, PHP

这是我尝试过的代码。文件大小为0字节。我还设置了imagedata=br.download(…)，它报告len()为0。我已经研究了好几个小时了…什么好主意吗?

pre_record_soup='[<img src='/show_pic.php?id=316600'>]' #simplified
def func_get_pic(pre_record_soup, br=spynner.Browser()):
    baseurl='http://www.testsite.com/'
    for record in pre_record_soup:
        imagetag=record.find('img')
        filename = 'image.jpg' #set name of file afterdownload
        try:
            if imagetag:
                piclink = imagetag.find('img')['src']
            else:
                piclink = 'basicimages/icons/icon.gif'
                filename = 'icon.gif'
        except TypeError:
            return None
        print baseurl+piclink #this prints the expected link
        print filename #this prints the filename I want
        with open('/home/myhome/'+filename, 'wb') as handle:
            br.download(baseurl+piclink,handle) #not retrieving image...

我还在spynner的身份验证会话中调用该函数。斯宾纳帮我登录了一个网站，我把这些数据和其他数据都刮了出来。其他数据(文本)擦得很好。此外，当我在浏览器中访问图像URL时，它会正确显示jpeg文件。

谢谢你的帮助!

编辑- 2014年3月10日//这是spynner给我的调试信息。请注意，php提供的图像的url格式是正确的，并且在正确下载的.gif:

http://www.testsite.com/show_pic.php?id=81851
Request: GET http://www.testsite.com/show_pic.php?id=81851
Start download: http://www.testsite.com/show_pic.php?id=81851
Download finished: http://www.testsite.com/show_pic.php?id=81851
http://www.testsite.com/basicimages/icons/icon.gif
Request: GET http://www.testsite.com/basicimages/icons/icon.gif
Start download: http://www.testsite.com/basicimages/icons/icon.gif
Read from download stream (419 bytes): http://www.testsite.com/basicimages/icons/icon.gif
Download finished: http://www.testsite.com/basicimages/icons/icon.gif

来自br的附加信息调试流。负载。注意content-length为0字节。这在Firefox中加载得很好…啊!

Page load started
Request: GET http://www.testsite.com/show_pic.php?id=81851
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.21 (KHTML, like Gecko)     Qt/4.8.4 Safari/537.21
Reply: 200/OK - http://www.testsite.com/show_pic.php?id=81851
  Date: Tue, 11 Mar 2014 01:16:35 GMT
  Server: Apache
  Set-Cookie: PHPSESSID=abvcv4j6hbu57a638tc8pg8i77b19bl0; path=/
  Content-Length: 0
  Connection: close
  Content-Type: text/html
Page load finished (39 bytes): http://www.testsite.com/show_pic.php?id=81851 (successful)