feat: allow custom API base URL for Anthropic provider#683
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Add an optional "API base URL" field to the Anthropic provider setup so it can target an Anthropic-compatible proxy or gateway (LiteLLM, corporate gateway, self-hosted relay) instead of being pinned to https://api.anthropic.com. The base URL is normalized to the /v1/messages path, accepting a bare host, a versioned base (.../v1), or a full messages endpoint. It defaults to the official endpoint, so existing configurations are unaffected. - const: add CONF_ANTHROPIC_BASE_URL - providers: Anthropic accepts an endpoint and resolves the request URL via _get_request_url(); used in both _make_request and validate - config_flow: optional base URL field in the Anthropic step (+ reconfigure) - __init__: persist the field into the provider config - strings/en: document the new field - tests: URL normalization, factory wiring, and config-flow forwarding Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What & why
Adds an optional API base URL field to the Anthropic provider so it can target an Anthropic-compatible proxy or gateway (e.g. LiteLLM, a corporate gateway, or a self-hosted relay) instead of being pinned to
https://api.anthropic.com.Several providers already support a custom base URL (Custom OpenAI, OpenWebUI, OpenRouter, Azure, LocalAI, Ollama), but Anthropic was hardcoded to
ENDPOINT_ANTHROPIC. This brings Anthropic in line with the existing "Custom OpenAI" pattern.Behaviour
https://api.anthropic.com/v1/messages./v1/messagespath, so users can enter any of:https://proxy.example.com→https://proxy.example.com/v1/messageshttps://proxy.example.com/v1→https://proxy.example.com/v1/messageshttps://proxy.example.com/v1/messages(used as-is)Changes
const.py: addCONF_ANTHROPIC_BASE_URLproviders.py:Anthropicaccepts anendpointand resolves the request URL via a new_get_request_url()helper, used in both_make_requestandvalidate;ProviderFactorywires the configured base URL throughconfig_flow.py: optional base URL field in the Anthropic step (setup + reconfigure)__init__.py: persist the field into the per-entry provider configstrings.json/translations/en.json: document the new field (other languages are generated viatranslator.py)Tests
_get_request_url) across bare host //v1/ full-endpoint / trailing-slash / blank inputsProviderFactorypasses a custom base URL and falls back to the default🤖 Generated with Claude Code