Python可参考一个示例代码

import httplib, mimetypes

def post_multipart(host, selector, fields, files):
 """
 Post fields and files to an http host as multipart/form-data.
 fields is a sequence of (name, value) elements for regular form fields.
 files is a sequence of (name, filename, value) elements for data to be uploaded as files
 Return the server's response page.
 """
 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):
 """
 fields is a sequence of (name, value) elements for regular form fields.
 files is a sequence of (name, filename, value) elements for data to be uploaded as files
 Return (content_type, body) ready for httplib.HTTP instance
 """
 BOUNDARY = '----------ThIs_Is_tHe_bouNdaRY_$'
 CRLF = '\r\n'
 L = []
 for (key, value) in fields:
 L.append('--' + BOUNDARY)
 L.append('Content-Disposition: form-data; name="%s"' % key)
 L.append('')
 L.append(value)
 for (key, filename, value) in files:
 L.append('--' + BOUNDARY)
 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('--' + BOUNDARY + '--')
 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'