Comments on: Handling multipart/form-data in Python

By: pete

pete — Thu, 10 Nov 2011 18:55:29 +0000

Yes, yes, and yes! I’ve been scouring the web for a simple way to upload a simple file, and this is it. Many thanks.

By: bruzed

bruzed — Fri, 14 Jan 2011 18:33:46 +0000

hi, is there a reason why this might not work on python under windows? it looks like it doesn’t write all the parts. just wanted to check if anyone faced something similar. thanks!

By: stacy

stacy — Wed, 12 May 2010 18:09:05 +0000

demikaze: I add it because of the python formatter / processor I use. It makes it work correctly, and it also causes the Eclipse environment to correctly indent, etc. In short, yes, it is needed (by me, not the interpreter).

By: demikaze

demikaze — Wed, 12 May 2010 11:45:34 +0000

‘return’ without parameters is not needed

By: Larry Henrie

Larry Henrie — Sat, 06 Mar 2010 23:33:48 +0000

Cool Thanks for this blog. I am new at development and this is a big help.

By: Raphaël Londeix

Raphaël Londeix — Fri, 14 Aug 2009 13:17:34 +0000

[code] #-*- coding: utf-8 -*- from hashlib import sha256 import random import time CRLF = '\r\n' class MultipartResponse(object): def __init__(self, multipart='mixed', boundary=None): if boundary is None: random.seed(time.time()) rand = random.randint(1000,999999999) self.boundary = sha256(str(rand)).hexdigest() self.content_type = 'multipart/'+multipart+'; boundary=%s' % self.boundary self.parts = [] def _addPart(self, data, headers): part = ['--' + self.boundary] + headers + [''] + [data] self.parts.append(CRLF.join(part)) def addText(self, text, charset="utf-8"): content_type = "Content-Type: text/plain; charset=%s" % charset self._addPart(text, [content_type]) def addHTML(self, html, charset="utf-8"): content_type = "Content-Type: text/html; charset=%s" % charset self._addPart(html, [content_type]) def addFile(self, data, mime_type, filename, charset="utf-8"): content_type = "Content-Type: %s; charset=%s" % (mime_type, charset) content_disposition = "Content-disposition: attachment; filename=%s" % filename self._addPart(data, [content_type, content_disposition]) def render(self): all = self.parts + ['--' + self.boundary + '--'] + [''] return CRLF.join(all) [code]

By: Raphaël Londeix

Raphaël Londeix — Fri, 14 Aug 2009 13:16:47 +0000

Hi, your post inspired me to solve a big problem : know if an iframe is loaded.
My solution for download file with iframe, and fire an event with browser that does not support onload event is to give a multipart response.
the first part is the file, and the second is anything you want, either a ‘special’ string or an html page that contains a .
In my case, I just try if the Iframe contains the string ‘download_done’ every 100ms… Another dirty hack

my simple class :

#-*- coding: utf-8 -*-

from hashlib import sha256
import random
import time

CRLF = ‘\r\n’

class MultipartResponse(object):

def __init__(self, multipart=’mixed’, boundary=None):
if boundary is None:
random.seed(time.time())
rand = random.randint(1000,999999999)
self.boundary = sha256(str(rand)).hexdigest()
self.content_type = ‘multipart/’+multipart+’; boundary=%s’ % self.boundary
self.parts = []

def _addPart(self, data, headers):
part = ['--' + self.boundary] + headers + [''] + [data]
self.parts.append(CRLF.join(part))

def addText(self, text, charset=”utf-8″):
content_type = “Content-Type: text/plain; charset=%s” % charset
self._addPart(text, [content_type])

def addHTML(self, html, charset=”utf-8″):
content_type = “Content-Type: text/html; charset=%s” % charset
self._addPart(html, [content_type])

def addFile(self, data, mime_type, filename, charset=”utf-8″):
content_type = “Content-Type: %s; charset=%s” % (mime_type, charset)
content_disposition = “Content-disposition: attachment; filename=%s” % filename
self._addPart(data, [content_type, content_disposition])

def render(self):
all = self.parts + ['--' + self.boundary + '--'] + ['']
return CRLF.join(all)

You can use it easely :

multipart = Multipart()
multipart.addFile(“pif;paf;pouf”, ‘text/csv’, ‘export.csv’) # your data here !
multipart.addText(‘download_done’)
response.setHeader(‘Content-Type’, multipart.content_type)
return multipart.render()