The version of httplib on App Engine doesn't lowercase headers name like the native version of httplib, so we do that here.
The version of httplib on App Engine doesn't lowercase headers name like the native version of httplib, so we do that here.

jcgregorio/httplib2,vytisb/httplib2,ashkanalam/httplib2,ashkanalam/httplib2,dchusovitin/httplib2,gcd0318/httplib2,vytisb/httplib2,jayvdb/httplib2,arcot/httplib2,bearieq/httplib2,jcgregorio/httplib2,smurfix/httplib2,javitjacob/httplib2,gcd0318/httplib2,smurfix/httplib2,ccstolley/httplib2,bearieq/httplib2,wikimedia/pywikibot-externals-httplib2,arcot/httplib2,bearieq/httplib2,vinodc/httplib2,vinodc/httplib2,dchusovitin/httplib2,ccstolley/httplib2,jayvdb/httplib2,javitjacob/httplib2,smurfix/httplib2,wikimedia/pywikibot-externals-httplib2