Work around issues with urllib and LIST request method

[ethanhs]

When using hvac I ran into an issue where I kept getting 400: Bad Request when I tried to list secrets.

The following gives me a 400:

from urllib.request import Request, urlopen
urlopen(Request(url='https://server/v1/mount/metadata/folder', headers={'X-Vault-Token': 'my-token'}, method='LIST'))

However using the list=true query parameter and GET:

from urllib.request import Request, urlopen
urlopen(Request(url='https://server/v1/mount/metadata/folder?list=true', headers={'X-Vault-Token': 'my-token'}, method='GET'))

The request works fine.

I've been able to reproduce this issue across Linux/Python 3.7 and Windows/Python 3.9

Could hvac switch to using the query parameter to work around this issue?

[tommyzli]

If you initialize hvac.Client with strict_http=True, it will rewrite the LIST requests as GETs with the list query parameter: #689