upload.py

#!/usr/bin/env python
import urllib, urllib2, base64, mimetools, stat, mimetypes
import os

file = "data.bin"
url = r"http://localhost:3000/apps.json"
boundary = u"--------python"

file_dict = {"file": open(file, "rb")}

def multipart_formdata(file_dict):
    lines = []
    for k, fd in file_dict.iteritems():
        filename = fd.name.split('/')[-1]
        lines.append(u'--' + boundary)
        lines.append(u'Content-Type: application/octet-stream')
        lines.append(u'Content-Disposition: form-data; name="%s"; filename="%s"' % (k, filename) )
        lines.append(u'')
        lines.append(fd.read())
    lines.append(u"--%s--" % boundary)
    lines.append(u'')
    value = u"\r\n".join(lines)
    return value

req = urllib2.Request(url)
req.add_header("Content-Type",
                   "multipart/form-data; boundary=%s" % boundary)

data = multipart_formdata(file_dict)
conn = urllib2.urlopen(req, data)