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Found this recipe to post multipart using httplib directly (no external libraries involved)

import httplib
import mimetypes
def post_multipart(host, selector, fields, files):
 content_type, body = encode_multipart_formdata(fields, files)
 h = httplib.HTTP(host)
 h.putrequest('POST', selector)
 h.putheader('content-type', content_type)
 h.putheader('content-length', str(len(body)))
 h.endheaders()
 h.send(body)
 errcode, errmsg, headers = h.getreply()
 return h.file.read()
def encode_multipart_formdata(fields, files):
 LIMIT = '----------lImIt_of_THE_fIle_eW_$'
 CRLF = '\r\n'
 L = []
 for (key, value) in fields:
 L.append('--' + LIMIT)
 L.append('Content-Disposition: form-data; name="%s"' % key)
 L.append('')
 L.append(value)
 for (key, filename, value) in files:
 L.append('--' + LIMIT)
 L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
 L.append('Content-Type: %s' % get_content_type(filename))
 L.append('')
 L.append(value)
 L.append('--' + LIMIT + '--')
 L.append('')
 body = CRLF.join(L)
 content_type = 'multipart/form-data; boundary=%s' % BOUNDARY
 return content_type, body
def get_content_type(filename):
 return mimetypes.guess_type(filename)[0] or 'application/octet-stream'

Found this recipe to post multipart using httplib directly (no external libraries involved)

import httplib
import mimetypes
def post_multipart(host, selector, fields, files):
 content_type, body = encode_multipart_formdata(fields, files)
 h = httplib.HTTP(host)
 h.putrequest('POST', selector)
 h.putheader('content-type', content_type)
 h.putheader('content-length', str(len(body)))
 h.endheaders()
 h.send(body)
 errcode, errmsg, headers = h.getreply()
 return h.file.read()
def encode_multipart_formdata(fields, files):
 LIMIT = '----------lImIt_of_THE_fIle_eW_$'
 CRLF = '\r\n'
 L = []
 for (key, value) in fields:
 L.append('--' + LIMIT)
 L.append('Content-Disposition: form-data; name="%s"' % key)
 L.append('')
 L.append(value)
 for (key, filename, value) in files:
 L.append('--' + LIMIT)
 L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
 L.append('Content-Type: %s' % get_content_type(filename))
 L.append('')
 L.append(value)
 L.append('--' + LIMIT + '--')
 L.append('')
 body = CRLF.join(L)
 content_type = 'multipart/form-data; boundary=%s' % LIMIT
 return content_type, body
def get_content_type(filename):
 return mimetypes.guess_type(filename)[0] or 'application/octet-stream'