3

我正在尝试上传一个 0 字节的文件，其中包含对 owncloud 的请求。我想为此使用类似文件的对象。通常我会这样做：

file_obj = io.BytesIO(b'')
response = requests.put('http://localhost/remote.php/webdav',
                                    auth=('xxx', 'xxx'),
                                    data=file_obj)

但它冻结了。如果我中断进程，我会看到堆栈跟踪挂在哪里：

Traceback (most recent call last):
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 376, in _make_request
    httplib_response = conn.getresponse(buffering=True)
TypeError: getresponse() got an unexpected keyword argument 'buffering'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/julian/cc/client/cc/storage/webdav.py", line 360, in <module>
    main()
  File "/home/julian/cc/client/cc/storage/webdav.py", line 351, in main
    data=file_obj)
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/api.py", line 120, in put
    return request('put', url, data=data, **kwargs)
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/api.py", line 53, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/sessions.py", line 468, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/sessions.py", line 576, in send
    r = adapter.send(request, **kwargs)
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/adapters.py", line 376, in send
    timeout=timeout
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 559, in urlopen
    body=body, headers=headers)
  File "/home/julian/cc/client/.venv/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 378, in _make_request
    httplib_response = conn.getresponse()
  File "/usr/lib64/python3.5/http/client.py", line 1174, in getresponse
    response.begin()
  File "/usr/lib64/python3.5/http/client.py", line 282, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python3.5/http/client.py", line 243, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/usr/lib64/python3.5/socket.py", line 575, in readinto
    return self._sock.recv_into(b)
KeyboardInterrupt

Wireshark 告诉我 requests sendet 以下请求，这似乎很好，但从未得到答案：

PUT /remote.php/webdav/test.txt HTTP/1.1
Host: localhost
Connection: keep-alive
Accept-Encoding: gzip, deflate
Authorization: Basic ***********
Transfer-Encoding: chunked
User-Agent: python-requests/2.9.1
Accept: */*
Content-Length: 0

如果我发送一个空字符串，它会起作用：

response = requests.put('http://localhost/remote.php/webdav/test.txt',
                                    auth=('xxx', 'xxx'),
                                    data='')

HTTP 流：

PUT /remote.php/webdav/test.txt HTTP/1.1
Host: localhost
Content-Length: 0
Accept-Encoding: gzip, deflate
Connection: keep-alive
User-Agent: python-requests/2.9.1
Accept: */*
Authorization: Basic ******



HTTP/1.1 204 No Content
Date: Thu, 24 Mar 2016 16:14:28 GMT
Server: Apache/2.4.10 (Debian) PHP/5.6.19
X-Powered-By: PHP/5.6.19
Set-Cookie: xxx=xxx; path=/; HttpOnly
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Set-Cookie: oc_sessionPassphrase=xxxx; path=/; httponly
Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; frame-src *; img-src * data: blob:; font-src 'self' data:; media-src *; connect-src *
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Frame-Options: Sameorigin
X-Robots-Tag: none
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Set-Cookie: xxx=xxx; path=/; HttpOnly
OC-FileId: xxxxx
Content-Length: 0
ETag: "xxx"
OC-ETag: "xxx"
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

这也有效：

def chunker(file_obj):
    buf = None
    while buf != b'':
        print('iter')
        buf = file_obj.read(16*1024)
        yield buf

file_obj = io.BytesIO(b'')
response = requests.put('http://localhost/remote.php/webdav/test.txt',
                                    auth=('xxx', 'xxx'),
                                    data=chunker(file_obj))

任何想法为什么这不适用于类似文件的对象？我正在使用最新版本的请求（2.9.1）和 Python 3.5。

4

1 回答 1

5

中似乎有一个错误requests。没有指定auth请求使用并在请求结束时Transfer-Encoding: chunked发送正确，但没有发送并且标头混淆。last-chunkauthlast-chunk

来自https://www.rfc-editor.org/rfc/rfc7230#section-4.1：

 chunked-body   = *chunk
                  last-chunk
                  trailer-part
                  CRLF

 chunk          = chunk-size [ chunk-ext ] CRLF
                  chunk-data CRLF
 chunk-size     = 1*HEXDIG
 last-chunk     = 1*("0") [ chunk-ext ] CRLF

 chunk-data     = 1*OCTET ; a sequence of chunk-size octets

和https://www.rfc-editor.org/rfc/rfc7230#section-3.3.2：

发送者不得在任何
包含 Transfer-Encoding 头字段的消息中发送 Content-Length 头字段。

没有auth论据

f = io.BytesIO(b'')
requests.put('http://localhost:8000/asdf', data=f)

发送的请求是

PUT /asdf HTTP/1.1⏎
Host: localhost:8000⏎
User-Agent: python-requests/2.9.1⏎
Transfer-Encoding: chunked⏎
Accept-Encoding: gzip, deflate⏎
Connection: keep-alive⏎
Accept: */*⏎
⏎
0⏎
⏎

（⏎ 表示上面的 CRLF）。但是如果你指定auth

requests.put('http://localhost:8000/asdf', auth=('asdf', 'fdsa'), data=f)

请求是

PUT /asdf HTTP/1.1⏎
Host: localhost:8000⏎
Transfer-Encoding: chunked⏎
Accept-Encoding: gzip, deflate⏎
User-Agent: python-requests/2.9.1⏎
Authorization: Basic YXNkZjpmZHNh⏎
Content-Length: 0⏎
Connection: keep-alive⏎
Accept: */*⏎
⏎

Transfer-Encoding和都Content-Length指定了，它不应该这样做，并且最后一个块没有发送，因此服务器等待更多块的到来并requests等待响应。

于 2016-03-25T10:00:23.733 回答