add socks proxy support

[kyhhdm]

Since I have to use unofficial-claude2-api through a socks proxy, this patch might also be helpful for others in the similar situation.

[st1vms]

Thanks so much for the improvement, although there are a couple of things I'd like to address before merging...

• The use_socks option should be set to False by default.
• http scheme should also be covered when routing via SOCKS proxy.
• There should also be an integer version number option for using SOCKS4 or SOCKS5.

I'm thinking of modifying the __get_proxy logic, using a class extension strategy for HTTPProxy and another possible proxy class which could be called SOCKSProxy and derives from the same base class as HTTPProxy.

So that users can simply import the corresponding class, configure it and provide it to the ClaudeAPIClient constructor.

I'll push directly to this PR once I finished the changes.

[st1vms]

@kyhhdm Can you please give a try to this new commit?

You now need to import SOCKSProxy out of claude2_api.client and construct it using:

• proxy_ip
• proxy_port
• version_num which can be either 4 or 5 (defaults to 4).

If you'd like to use HTTPProxy instead, import it as usual, and set the ip,port and use_ssl parameter.

[kyhhdm]

I tested with the new commit with my socks5 proxy, it works well~

[st1vms]

Glad to hear that 👍

Merging right away!