headers.get_all() not in python2.6

acme-tiny-chain.patch

@@ -1,9 +1,9 @@
 diff -up ./acme_tiny.py.chain ./acme_tiny.py
 --- ./acme_tiny.py.chain	2017-05-16 03:57:46.000000000 -0400
-+++ ./acme_tiny.py	2017-11-22 12:18:56.963653336 -0500
++++ ./acme_tiny.py	2017-11-22 15:14:19.270485351 -0500
 @@ -1,4 +1,4 @@
 -#!/usr/bin/env python
-+#!/usr/bin/python3
++#!/usr/bin/python
  import argparse, subprocess, json, os, sys, base64, binascii, time, hashlib, re, copy, textwrap, logging
  try:
      from urllib.request import urlopen # Python 3
@@ -73,14 +73,14 @@ diff -up ./acme_tiny.py.chain ./acme_tiny.py
 +    certchain = [result]
 +    if chain:
 +        def parse_link_header(line):
-+            m = re.search(r"^<([^>]*)>(?:\s*;\s*(.*))?$", line)
++            m = re.search(r"^Link:\s*<([^>]*)>(?:\s*;\s*(.*))?\r\n$", line)
 +            return (m.group(1), dict([(a[0],a[1].strip('"'))
 +                for a in [attr.split("=") 
 +                    for attr in m.group(2).split("\s*;\s*")]]))
 +
 +        up = [
 +          link for link, attr in [
-+            parse_link_header(l) for l in headers.get_all("Link")
++            parse_link_header(l) for l in headers.getallmatchingheaders("Link")
 +          ] if attr['rel'] == 'up'
 +        ]
 +        certchain += [urlopen(url).read() for url in up]