Set HTTP_PROXY and HTTPS_PROXY from user / OS config

[chrmarti]

No description provided.

[Copilot]

Pull request overview

This PR adds proxy-resolution plumbing to the agent host so the Copilot SDK subprocess can inherit an accurate HTTP_PROXY / HTTPS_PROXY derived from VS Code’s proxy configuration (settings/env) and, when local, the Electron session (system proxy/PAC).

Changes:

• Add a reverse-RPC channel (renderer → agent host) to resolve proxies via IRequestService.resolveProxy, plus a node-side AgentHostProxyResolver that feeds this into @vscode/proxy-agent.
• Extend CopilotAgent to resolve the effective CAPI endpoint host (token-discovered) and inject HTTP_PROXY/HTTPS_PROXY into the SDK subprocess env; restart the client when a token change would change the resolved proxy.
• Extend ICopilotApiService with resolveApiEndpoint() and update affected tests/fakes accordingly.

Show a summary per file

File	Description
src/vs/platform/agentHost/test/node/copilotAgent.test.ts	Updates test DI wiring for the new proxy resolver dependency.
src/vs/platform/agentHost/test/node/codex/codexProxyService.test.ts	Updates fake ICopilotApiService to include resolveApiEndpoint.
src/vs/platform/agentHost/test/node/claudeProxyService.test.ts	Updates fake/wrapped ICopilotApiService shapes to include resolveApiEndpoint.
src/vs/platform/agentHost/test/node/claudeAgent.test.ts	Updates fake ICopilotApiService to include resolveApiEndpoint.
src/vs/platform/agentHost/test/node/claudeAgent.integrationTest.ts	Updates stub ICopilotApiService to include resolveApiEndpoint.
src/vs/platform/agentHost/test/node/agentService.test.ts	Updates fake ICopilotApiService to include resolveApiEndpoint.
src/vs/platform/agentHost/test/node/agentHostSessionTitleController.test.ts	Updates fake ICopilotApiService to include resolveApiEndpoint.
src/vs/platform/agentHost/test/node/agentHostPullRequestOperationHandler.test.ts	Updates fake ICopilotApiService to include resolveApiEndpoint.
src/vs/platform/agentHost/test/node/agentHostCommitOperationHandler.test.ts	Updates fake ICopilotApiService to include resolveApiEndpoint.
src/vs/platform/agentHost/test/electron-browser/localAgentHostService.test.ts	Updates channel-registration expectations to include the new proxy channel.
src/vs/platform/agentHost/node/shared/copilotApiService.ts	Adds resolveApiEndpoint() and caches discovered endpoints.api per token.
src/vs/platform/agentHost/node/copilot/copilotAgent.ts	Resolves CAPI proxy and forwards it via HTTP_PROXY/HTTPS_PROXY; restarts client if proxy changes on token update.
src/vs/platform/agentHost/node/agentHostServerMain.ts	Registers IAgentHostProxyResolver in the server DI container.
src/vs/platform/agentHost/node/agentHostProxyResolver.ts	New node-side resolver that uses @vscode/proxy-agent + optional host proxy resolution via reverse channel.
src/vs/platform/agentHost/node/agentHostMain.ts	Wires the reverse proxy channel per renderer connection and registers the resolver in DI.
src/vs/platform/agentHost/electron-browser/localAgentHostService.ts	Registers the renderer-side proxy-resolution server channel.
src/vs/platform/agentHost/common/agentHostClientProxyChannel.ts	New IPC channel wrapper + renderer-side IServerChannel implementation for resolveProxy.

Review details

Comments suppressed due to low confidence (1)

src/vs/platform/agentHost/node/agentHostMain.ts:148

• The BYOK gating comment now mentions “proxy” in a way that’s ambiguous/misleading given this file also wires a separate proxy-resolution channel unconditionally. The comment should clarify it’s referring to the BYOK LM bridge/proxy behavior, not the new AgentHostProxyResolver.

	let proxyResolver: AgentHostProxyResolver | undefined;
	// Gate BYOK *use* behind the opt-in `chat.agentHost.byokModels.enabled`
	// setting, forwarded from the renderer as an env var. The proxy and bridge
	// registry are always constructed below (so the session launcher can inject
	// them), but when off they stay inert: the per-connection bridge and the

• Files reviewed: 17/17 changed files
• Comments generated: 1
• Review effort level: Low