How to use AWS certificate with python requests library?

You can make https get request to the DNS of the ELB.

To generate HTTPS request use following script quoted from this answer.

import urllib.request
r = urllib.request.urlopen('<DNS OF ELB>')
print(r.read())

If you really want to use http.client, you must call endheaders after you send the request headers:

import http.client
conn = http.client.HTTPSConnection('DNS OF ELB', 443)
conn.putrequest('GET', '/')
conn.endheaders() # <---
r = conn.getresponse()
print(r.read())

As a shortcut to putrequest/endheaders, you can also use the request method, like this:

import http.client
conn = http.client.HTTPSConnection('DOMAIN', 443)
conn.request('GET', '/') # <---
r = conn.getresponse()
print(r.read())

Update 1

For Python 2.7 You can use httplib or urllib2

If you are using httplib, HTTPS supports only if the socket module was compiled with SSL support.

For urllib2 refer this article.