base_url support instead of host, port, and scheme and move '/v1' to base_url

[daisukes]

When I want to connect to an OpenAI compatible proxy server (i.e. litellm), it does not accept requests including /v1 in the URL.

• This works http://localhost:8000/chat/completion
• This does not work http://localhost:8000/v1/chat/completion

The official OpenAI python library has base_url option to create client and the default base_url contains /v1

• https://github.com/openai/openai-python/blob/195c05a64d39c87b2dfdf1eca2d339597f1fce03/src/openai/_client.py#L121

        if base_url is None:
            base_url = f"https://api.openai.com/v1"

I can make a client for my proxy like

client = openai.OpenAI(api_key="api-key", base_url="http://localhost:8000")

So, I want base_url support instead of host, port and scheme configuration here.

OpenAI/Sources/OpenAI/OpenAI.swift

Line 30 in 843e087

public init(token: String, organizationIdentifier: String? = nil, host: String = "api.openai.com", port: Int = 443, scheme: String = "https", timeoutInterval: TimeInterval = 60.0) {

Also, I want APIPath not including /v1 and move it to base_url

OpenAI/Sources/OpenAI/OpenAI.swift

Lines 211 to 231 in 843e087

	extension APIPath {
	static let completions = "/v1/completions"
	static let embeddings = "/v1/embeddings"
	static let chats = "/v1/chat/completions"
	static let edits = "/v1/edits"
	static let models = "/v1/models"
	static let moderations = "/v1/moderations"
	static let audioSpeech = "/v1/audio/speech"
	static let audioTranscriptions = "/v1/audio/transcriptions"
	static let audioTranslations = "/v1/audio/translations"
	static let images = "/v1/images/generations"
	static let imageEdits = "/v1/images/edits"
	static let imageVariations = "/v1/images/variations"
	func withPath(_ path: String) -> String {
	self + "/" + path
	}
	}

[codeAndxv]

I need this feature. Can a manager review this PR and merge it into the code?