HTTPS proxy support

[alireza18878]

Describe the bug
Tableauserverclient does not support proxy over HTTPS (it supports proxy over HTTP, but not HTTPS).

Versions
Details of your environment, including:

• Tableau Server version (or note if using Tableau Online): N/A
• Python version: 3.5
• TSC library version: 0.15

To Reproduce
When trying to use tableauserverclient with a HTTPS proxy, I get error 403 Forbidden since the library is not able to communicate over HTTPS proxy.

Results
Error 403 Forbidden, caused by proxy error.

Can you please let me know if the newer versions of tableauserverclient support HTTPS proxy?

[jacalata]

Yes, I believe it was introduced in v22?

[alireza18878]

Yes, I believe it was introduced in v22?

Thank you @jacalata. I suppose you were referring to v0.22 right?

[bcantoni]

Yes, she was referring to v0.22, meaning that was the version where proxy support was introduced. I would suggest trying the latest version of TSC and see what your results are.

[HsiehYuho]

Out of curiosity, you meant http option or http_proxy support ? as this is the 0.23 changelog https://fburl.com/padmojhu (I didn't see much from 0.22 changelog, I maybe wrong tho) and seems it is for supporting http option ?

[jacalata]

Not sure what you meant to link but that's an fb internal URL.

The http_option allows you to pass in any set of proxy values - what you set here flows through as a parameter to the requests.send call. e.g

    my_proxies = {
        'http': 'http://10.10.1.10:3128',
        **'https': 'http://10.10.1.10:1080',**
    }
    server = TSC.Server(server_url, use_server_version=True, http_options={"verify": use_ssl, "proxies": my_proxies})