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Create and parse multipart HTTP requests in Python

由 别说谁变了你拦得住时间么 提交于 2019-11-30 13:07:49

I used this package by Will Holcomb http://pypi.python.org/pypi/MultipartPostHandler/0.1.0 to make multi-part requests with urllib2, it may help you out.

After a bit of exploration, the answer to this question has become clear. The short answer is that although the Content-Disposition is optional in a Mime-encoded message, web.py requires it for each mime-part in order to correctly parse out the HTTP request.

Contrary to other comments on this question, the difference between HTTP and Email is irrelevant, as they are simply transport mechanisms for the Mime message and nothing more. Multipart/related (not multipart/form-data) messages are common in content exchanging webservices, which is the use case here. The code snippets provided are accurate, though, and led me to a slightly briefer solution to the problem.

# open an HTTP connection
h1 = httplib.HTTPConnection('localhost:8080')

# create a mime multipart message of type multipart/related
msg = MIMEMultipart("related")

# create a mime-part containing a zip file, with a Content-Disposition header
# on the section
fp = open('file.zip', 'rb')
base = MIMEBase("application", "zip")
base['Content-Disposition'] = 'file; name="package"; filename="file.zip"'
base.set_payload(fp.read())
encoders.encode_base64(base)
msg.attach(base)

# Here's a rubbish bit: chomp through the header rows, until hitting a newline on
# its own, and read each string on the way as an HTTP header, and reading the rest
# of the message into a new variable
header_mode = True
headers = {}
body = []
for line in msg.as_string().splitlines(True):
    if line == "\n" and header_mode == True:
        header_mode = False
    if header_mode:
        (key, value) = line.split(":", 1)
        headers[key.strip()] = value.strip()
    else:
        body.append(line)
body = "".join(body)

# do the request, with the separated headers and body
h1.request("POST", "http://localhost:8080/server", body, headers)

This is picked up perfectly well by web.py, so it's clear that email.mime.multipart is suitable for creating Mime messages to be transported by HTTP, with the exception of its header handling.

My other overall conern is in scalability. Neither this solution nor the others proposed here scale well, as they read the contents of a file into a variable before bundling up in the mime message. A better solution would be one which could serialise on demand as the content is piped out over the HTTP connection. It's not urgent for me to fix that, but I'll come back here with a solution if I get to it.

There is a number of things wrong with your request. As TokenMacGuy suggests, multipart/mixed is unused in HTTP; use multipart/form-data instead. In addition, parts should have a Content-disposition header. A python fragment to do that can be found in the Code Recipes.

标签
python
http
mime
multipart
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