Post request with multipart/form-data in appengine python not working

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I\'m attempting to send a multipart post request from an appengine app to an external (django) api hosted on dotcloud. The request includes some text and a file (pdf) and is

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遥遥无期

2020-12-18 06:33

Here is some code I tested locally that should do the trick (I used a different handler than webapp2 but tried to modify it to webapp2. You'll also need the poster lib found here http://atlee.ca/software/poster/):

In your POST handler on GAE:

from google.appengine.api import urlfetch
from poster.encode import multipart_encode
payload = {}
payload['test_file'] = self.request.POST['test_file']
payload['user_id'] = self.request.POST['user_id']
to_post = multipart_encode(payload)
send_url = "http://127.0.0.1:8000/"
result = urlfetch.fetch(url=send_url, payload="".join(to_post[0]), method=urlfetch.POST, headers=to_post[1])
logging.info(result.content)

Make sure your HTML form contains method="POST" enctype="multipart/form-data". Hope this helps!

EDIT: I tried using the webapp2 handler and realized the way files are served are different than how the framework I used to test with works (KAY). Here is updated code that should do the trick (tested on production):

import webapp2
from google.appengine.api import urlfetch
from poster.encode import multipart_encode, MultipartParam

class UploadTest(webapp2.RequestHandler):
  def post(self): 
    payload = {}
    file_data = self.request.POST['test_file']
    payload['test_file'] = MultipartParam('test_file', filename=file_data.filename,
                                          filetype=file_data.type,
                                          fileobj=file_data.file)
    payload['name'] = self.request.POST['name']
    data,headers= multipart_encode(payload)
    send_url = "http://127.0.0.1:8000/"
    t = urlfetch.fetch(url=send_url, payload="".join(data), method=urlfetch.POST, headers=headers)
    self.response.headers['Content-Type'] = 'text/plain'
    self.response.out.write(t.content)
  def get(self):
    self.response.out.write("""
    <html>
        <head>
            <title>File Upload Test</title>
        </head>
        <body>
            <form action="" method="POST" enctype="multipart/form-data">
                <input type="text" name="name" />
                <input type="file" name="test_file" />
                <input type="submit" value="Submit" />
            </form>
        </body>
    </html>""")

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醉话见心

2020-12-18 06:33

You're urlencoding the data where you should be multipart_encoding it. Have a look at this: Trying to post multipart form data in python, won't post

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