Configure HTTPS agent for proxies (#775)

- Some workflows require you to route openAI API traffic through a proxy
- See
https://github.com/openai/openai-node/tree/v4?tab=readme-ov-file#configuring-an-https-agent-eg-for-proxies
for more details

---------

Co-authored-by: Thibault Sottiaux <tibo@openai.com>
Co-authored-by: Fouad Matin <fouad@openai.com>

codex-cli/package.json

@@ -34,6 +34,7 @@
     "fast-npm-meta": "^0.4.2",
     "figures": "^6.1.0",
     "file-type": "^20.1.0",
+    "https-proxy-agent": "^7.0.6",
     "ink": "^5.2.0",
     "js-yaml": "^4.1.0",
     "marked": "^15.0.7",

codex-cli/src/utils/agent/agent-loop.ts

@@ -29,6 +29,7 @@ import {
   setSessionId,
 } from "../session.js";
 import { handleExecCommand } from "./handle-exec-command.js";
+import { HttpsProxyAgent } from "https-proxy-agent";
 import { randomUUID } from "node:crypto";
 import OpenAI, { APIConnectionTimeoutError } from "openai";
 
@@ -38,6 +39,9 @@ const RATE_LIMIT_RETRY_WAIT_MS = parseInt(
   10,
 );
 
+// See https://github.com/openai/openai-node/tree/v4?tab=readme-ov-file#configuring-an-https-agent-eg-for-proxies
+const PROXY_URL = process.env["HTTPS_PROXY"];
+
 export type CommandConfirmation = {
   review: ReviewDecision;
   applyPatch?: ApplyPatchCommand | undefined;
@@ -314,6 +318,7 @@ export class AgentLoop {
           : {}),
         ...(OPENAI_PROJECT ? { "OpenAI-Project": OPENAI_PROJECT } : {}),
       },
+      httpAgent: PROXY_URL ? new HttpsProxyAgent(PROXY_URL) : undefined,
       ...(timeoutMs !== undefined ? { timeout: timeoutMs } : {}),
     });