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Signature mismatch on get_media for dfareporting

See original GitHub issue

Environment details

OS: macOS 10.14.4, linux
Python version: 3.7.4
pip version: 19.0.3
google-api-python-client version: 1.7.11

Steps to reproduce

Sorry, I cannot share the whole code, but the main idea is:

from apiclient import discovery
creds = OAuth2Credentials(...)
http = creds.authorize(http = httplib2.Http())
service = discovery.build('dfareporting', 'v3.3', http=http)  
service.files().get_media(...).execute()

I’m getting this error:

W0813 19:40:45.663586 1 http.py:118] Invalid JSON content from response: b"<?xml version='1.0' encoding='UTF-8'?><Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.</Message><StringToSign>GET\n\n\n1565725545\nx-goog-api-client:gdcl/1.7.11 gl-python/3.7.4\n/...</StringToSign></Error>"

I’ve tested the same code with version 1.7.10, and it works. I think this may be a regression introduced here, but I’m not sure: https://github.com/googleapis/google-api-python-client/pull/734

cc @busunkim96 @tseaver @dazuma