在Python中真的可以POST文件吗？

Question

我已经在这个问题上纠结了两天，还是没有解决。网上找到了一些解决方案，但每次尝试用POST发送文件时，依然出现“内部服务器错误”。我的想法是这样的：我在Python的命令行中打开一个文件，然后把它发送到我服务器上的一个Django函数，这个函数会读取并保存这个文件。我试过了urllib、urllib2（有和没有poster模块）、httplib和Multipart方法。以下是我尝试过的所有方法和结果：

#Variables
In [35]: url = "http://www.address"
In [36]: values = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
In [37]: dataurllib = urllib.urlencode(values)
In [39]: dataposterlib, dataheaders = multipart_encode(values)
In [40]: dataposterlib
Out[40]: <generator object yielder at 0x15a0410>
In [41]: headers
{'Content-Length': 491,
 'Content-Type': 'multipart/form-data; boundary=13936c2ddba0441eab9c3f4133a4009e'}
In [43]: f = open("winter.jpg", "rb")
In [45]: filegen, fileheaders = multipart_encode({"file": f})
In [46]: filegen
Out[46]: <generator object yielder at 0xc5b3c0>
In [47]: fileheaders
Out[47]:
{'Content-Length': 39876,
 'Content-Type': 'multipart/form-data; boundary=0aa7a1b68d714440be06e166080925ec'}


#Working:

1. urllib.urlopen("http://www.address", data=urllib.urlencode({"key": "value"}))
2. urllib.urlopen(url, data=urllib.urlencode({"key": "value"}))
3. urllib.urlopen(url, data=urlib.urlencode(values))
4. urllib.urlopen(url, urlib.urlencode(values))
5. urllib.urlopen(url, data=dataurllib)
6. urllib.urlopen(url, dataurllib)
7. urllib.urlopen(url, data=urllib.urlencode({"file": f})) : works, but doesnt send file

8.  import cookielib
    from utils.multipart import MultipartPostHandler
    cookies = cookielib.CookieJar()
    opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookies), MultipartPostHandler)
    params = { "username": "bob", "password": "riviera", "file": f }
    opener.open(url, params)

#Not working: 

4. u = urllib.urlopen(url, "string")
5. u = urllib.urlopen(url, data="string")
7. u = urllib2.urlopen(url, data=urllib.urlencode(values)) : Error 500 but sends data
6. u = urllib2.urlopen("http://www.fandrive.yum.pl/event/upload/", data=urllib.urlencode({"key": "value"})) : Error 500 but sends data
7. u = urllib2.urlopen(url, data=urllib.urlencode({"key": "value"})) : Error 500 but sends data
8. u = urllib2.urlopen(url, data=dataurllib) : Error 500 but sends data
9. u = urllib2.urlopen(url, dataurllib) : Error 500 but sends data
10. In [31]: req = urllib2.Request(url, f, fileheaders)
    urllib2.urlopen(req)                                : Error 500
11. req = urllib2.Request(url, filegen, fileheaders)
    urllib2.urlopen(req)                                : Error 500, very seldomly sends data
12. req = urllib2.Request(url, dataurllib)
    urllib2.urlopen(req)                                : Error 500, sends data

我发现有其他人也遇到过同样的问题，所以我借用了他的Django函数（这个函数是基于这篇文章的）：

def upload(request):
    logging.debug("GO")
    for key, file in request.FILES.items():
        path = '/path/'+ file.name
        logging.debug(path)
        dest = open(path.encode('utf-8'), 'wb+')
        logging.debug(dest)
        if file.multiple_chunks:
            loggin.debug("big")
            for c in file.chunks():
                dest.write(c)
        else:
            logging.dobug("small")
            dest.write(file.read())
        dest.close()
    destination = path + 'test.txt'
    logging.debug(destination)
    file = open(destination, "a")
    file.write("file \n")
    file.close        
    return 0

我注意到即使我的函数在运行，发送的文件也没有被保存，而且在destination...之后的代码也被跳过了。就好像在到达这个地方之前就超时了。Wireshark显示POST请求已经发送，但服务器总是返回500错误。这是怎么回事呢？我尝试了几种组合，使用我的两个服务器以及从本地计算机发送，但还是没有结果。我到底漏掉了什么？我用的代码和网上其他人一样。即使是内置的urllib2模块也总是出错，尽管urllib可以正常工作。

编辑

我把服务器换成了另一个，终于得到了一个可靠的错误日志（接收方）：

[Sat Oct 16 20:40:46 2010] [error] [client IP] mod_python (pid=24773, interpreter='host', phase='PythonHandler', handler='django.core.handlers.modpython'): Application error
[Sat Oct 16 20:40:46 2010] [error] [client IP] ServerName: 'xxx'
[Sat Oct 16 20:40:46 2010] [error] [client IP] DocumentRoot: 'path'
[Sat Oct 16 20:40:46 2010] [error] [client IP] URI: '/error/internalServerError.html'
[Sat Oct 16 20:40:46 2010] [error] [client IP] Location: None
[Sat Oct 16 20:40:46 2010] [error] [client IP] Directory: None
[Sat Oct 16 20:40:46 2010] [error] [client IP] Filename: 'path/error/internalServerError.html'
[Sat Oct 16 20:40:46 2010] [error] [client IP] PathInfo: ''
[Sat Oct 16 20:40:46 2010] [error] [client IP] Traceback (most recent call last):
[Sat Oct 16 20:40:46 2010] [error] [client IP]   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1537, in HandlerDispatch\n    default=default_handler, arg=req, silent=hlist.silent)
[Sat Oct 16 20:40:46 2010] [error] [client IP]   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1229, in _process_target\n    result = _execute_target(config, req, object, arg)
[Sat Oct 16 20:40:46 2010] [error] [client IP]   File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1128, in _execute_target\n    result = object(arg)
[Sat Oct 16 20:40:46 2010] [error] [client IP]   File "/usr/lib/python2.5/site-packages/django/core/handlers/modpython.py", line 228, in handler\n    return ModPythonHandler()(req)
[Sat Oct 16 20:40:46 2010] [error] [client IP]   File "/usr/lib/python2.5/site-packages/django/core/handlers/modpython.py", line 220, in __call__\n    req.write(chunk)
[Sat Oct 16 20:40:46 2010] [error] [client IP] IOError: Write failed, client closed connection.
[Sat Oct 16 20:40:46 2010] [error] [client IP] python_handler: Dispatch() returned non-integer.

django 错误处理 http请求文件上传 urllib POST请求服务器错误网络调试

在Python中真的可以POST文件吗？

编辑

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