fix(api-proxy): use 'token' auth prefix for Copilot Business endpoint by lpcox · Pull Request #5415 · github/gh-aw-firewall

lpcox · 2026-06-22T21:33:54Z

Problem

Copilot Business customers (COPILOT_API_TARGET=api.business.githubcopilot.com, typically on a *.ghe.com GHEC server) get 400 bad request: Authorization header is badly formatted on every Copilot request, and the run exits 1.

The auth-prefix logic in copilot.js#getAuthHeaders only applied the token <oauth> Authorization prefix when isGhesInstance(rawTarget, env) was true. isGhesInstance only matches the enterprise host (api.enterprise.githubcopilot.com) directly, and its GITHUB_SERVER_URL heuristic explicitly treats *.ghe.com as not GHES. So for the business host on a *.ghe.com server it returns false, the GitHub OAuth token goes out as Bearer <oauth>, and the business endpoint rejects it.

api.business.githubcopilot.com did not appear anywhere in the source. The prior fixes (#4755, #5076) covered enterprise/GHES only.

Reported in github/gh-aw#38575 (still reproducing as of 2026-06-19).

Fix

Add copilotTargetRequiresGitHubTokenPrefix(resolvedTarget, env) in copilot-auth.js, and use it in getAuthHeaders for both the /models path and inference requests.

It returns true (→ token prefix for GitHub tokens) when either:

isGhesInstance() is true (unchanged GHES behavior), or
the resolved target is a GitHub-hosted endpoint that authenticates the GitHub token directly — api.enterprise.githubcopilot.com or api.business.githubcopilot.com.

Preserved invariants:

An explicit non-GHES AWF_PLATFORM_TYPE still forces Bearer (documented escape hatch, consistent with isGhesInstance).
BYOK API keys always use Bearer.
Standard api.githubcopilot.com and GHEC (*.ghe.com) Copilot targets keep Bearer.

Tests

copilot-auth.test.js: 8 unit tests for copilotTargetRequiresGitHubTokenPrefix (business host, business on *.ghe.com, GHES, standard, GHEC, AWF_PLATFORM_TYPE override).
copilot-adapter-enterprise.test.js: 5 adapter-level tests for the Business host (inference + /models use token; BYOK stays Bearer; accidental token prefix stripped).
Full api-proxy suite: 1290 passed.

Fixes github/gh-aw#38575

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

The Copilot auth-prefix logic only applied the 'token <oauth>' Authorization prefix when the resolved target was api.enterprise.githubcopilot.com (via isGhesInstance). Copilot Business customers set COPILOT_API_TARGET=api.business.githubcopilot.com, often on a *.ghe.com (GHEC) server. For that combination isGhesInstance returns false, so the GitHub token went out as 'Bearer <oauth>' and the business endpoint rejected it with "400 bad request: Authorization header is badly formatted". Add copilotTargetRequiresGitHubTokenPrefix(), which applies the 'token' prefix for both the Enterprise and Business GitHub-hosted Copilot endpoints (in addition to GHES), while still honoring an explicit non-GHES AWF_PLATFORM_TYPE override and keeping 'Bearer' for BYOK keys and standard/GHEC targets. Fixes github/gh-aw#38575 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

github-actions · 2026-06-22T21:35:11Z

✅ Coverage Check Passed

Overall Coverage

Metric	Base	PR	Delta
Lines	98.01%	98.05%	📈 +0.04%
Statements	97.95%	97.98%	📈 +0.03%
Functions	99.51%	99.51%	➡️ +0.00%
Branches	93.68%	93.72%	📈 +0.04%

📁 Per-file Coverage Changes (1 files)

File	Lines (Before → After)	Statements (Before → After)
`src/workdir-setup.ts`	92.7% → 94.5% (+1.82%)	92.7% → 94.5% (+1.82%)

Coverage comparison generated by scripts/ci/compare-coverage.ts

Copilot

Pull request overview

Fixes Copilot Business requests failing with 400 ... Authorization header is badly formatted by ensuring GitHub OAuth/PAT credentials use the correct token <value> auth scheme when targeting GitHub-hosted Copilot endpoints that require it (Business + Enterprise), including the /models path and inference calls.

Changes:

Introduces copilotTargetRequiresGitHubTokenPrefix() to decide when GitHub tokens must be sent as Authorization: token <value>.
Updates the Copilot provider adapter to apply token vs Bearer consistently for /models and inference based on the new predicate.
Adds unit + adapter-level tests covering Business host scenarios (including Business on *.ghe.com) and AWF_PLATFORM_TYPE override behavior.

Show a summary per file

File	Description
containers/api-proxy/providers/copilot.js	Switches auth-prefix decision logic to the new predicate for `/models` and inference requests.
containers/api-proxy/providers/copilot-auth.js	Adds `copilotTargetRequiresGitHubTokenPrefix()` and target allowlist for hosts requiring `token` prefix for GitHub credentials.
containers/api-proxy/copilot-auth.test.js	Adds focused unit tests for the new predicate across Business/Enterprise/GHES/GHEC/override cases.
containers/api-proxy/copilot-adapter-enterprise.test.js	Adds adapter-level regression tests ensuring Business target uses `token`, while BYOK remains `Bearer`.

Copilot's findings

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Files reviewed: 4/4 changed files
Comments generated: 0

github-actions · 2026-06-23T14:49:51Z

Chroot tests passed! Smoke Chroot - All security and functionality tests succeeded.

github-actions · 2026-06-23T14:49:51Z

❌ Smoke Copilot BYOK AOAI (api-key) reports failed. AOAI BYOK (api-key) mode investigation needed...

github-actions · 2026-06-23T14:49:52Z

✅ Smoke Copilot BYOK completed. Copilot BYOK mode operational. 🔓

github-actions · 2026-06-23T14:49:52Z

✅ Build Test Suite completed successfully!

github-actions · 2026-06-23T14:49:52Z

🔌 Smoke Services — All services reachable! ✅

github-actions · 2026-06-23T14:49:53Z

✨ The prophecy is fulfilled... Smoke Codex has completed its mystical journey. The stars align. 🌟

github-actions · 2026-06-23T14:49:53Z

✅ Smoke Claude passed

github-actions · 2026-06-23T14:49:54Z

🔑 Smoke Copilot PAT PAT auth validated. All systems operational. ✅

github-actions · 2026-06-23T14:49:55Z

✅ Smoke Gemini completed. All facets verified. 💎

github-actions · 2026-06-23T14:49:56Z

📰 VERDICT: Smoke Copilot has concluded. All systems operational. This is a developing story. 🎤

github-actions · 2026-06-23T14:49:57Z

📡 Smoke OTel Tracing completed. All tracing scenarios validated. ✅

github-actions · 2026-06-23T14:50:06Z

✅ Smoke Copilot BYOK AOAI (Entra) completed. Copilot AOAI BYOK (Entra) mode operational. 🔓

github-actions · 2026-06-23T14:52:41Z

Smoke Test: Claude Engine Validation

Check	Result
API status	✅ PASS
gh check	✅ PASS
File status	✅ PASS

Overall result: PASS

Generated by Smoke Claude for issue #5415 · 60.9 AIC · ⊞ 6.5K · ◷

github-actions · 2026-06-23T14:53:19Z

🔥 Smoke Test: Copilot PAT — PASS

Test	Result
GitHub MCP connectivity	✅
GitHub.com HTTP (200)	✅
File write/read	✅

Overall: PASS — @lpcox

Auth mode: PAT (COPILOT_GITHUB_TOKEN)

🔑 PAT report filed by Smoke Copilot PAT

github-actions · 2026-06-23T14:53:30Z

🔥 Smoke Test Results

PR: fix(api-proxy): use 'token' auth prefix for Copilot Business endpoint
Author: @lpcox

Test	Result
GitHub MCP connectivity	✅
GitHub.com HTTP connectivity	✅
File write/read	✅

Overall: PASS

📰 BREAKING: Report filed by Smoke Copilot

github-actions · 2026-06-23T14:53:55Z

✅ Smoke Test: Copilot BYOK (Direct Mode) - PASS

✅ GitHub MCP connectivity (2 merged PRs fetched)
✅ GitHub.com reachable (HTTP 200)
✅ File write/read verified
✅ BYOK inference working (agent → api-proxy → api.githubcopilot.com)

Running in direct BYOK mode (COPILOT_PROVIDER_API_KEY) with api-proxy forwarding.

🔑 BYOK report filed by Smoke Copilot BYOK

github-actions · 2026-06-23T14:54:00Z

Remove unused ParsedDomainList export from domain-matchers
Remove unused ParsedDomain from domain-patterns
GitHub reads: ✅
Browser: ✅
File write: ✅
Build: ✅
Overall: PASS

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

registry.npmjs.org

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "registry.npmjs.org"

See Network Configuration for more information.

🔮 The oracle has spoken through Smoke Codex

github-actions · 2026-06-23T14:54:19Z

Chroot Version Comparison Results

Runtime	Host Version	Chroot Version	Match?
Python	Python 3.12.13	Python 3.12.3	❌ No
Node.js	v24.16.0	v22.22.3	❌ No
Go	go1.22.12	go1.22.12	✅ Yes

Overall: ❌ Not all tests passed. Python and Node.js versions differ between host and chroot environments.

Tested by Smoke Chroot

github-actions · 2026-06-23T14:54:40Z

@lpcox

GitHub MCP Testing: ✅
GitHub.com Connectivity: ✅
File Write/Read Test: ✅
BYOK Inference Test: ✅

Running in direct BYOK mode (AWF_AUTH_TYPE=github-oidc + AWF_AUTH_AZURE_* + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw) authenticated via Microsoft Entra
Overall: PASS

🪪 BYOK (AOAI Entra) report filed by Smoke Copilot BYOK AOAI (Entra)

github-actions · 2026-06-23T14:55:34Z

@lpcox

Smoke test results:

PR 5422: ✅ refactor: extract buildAgentSecurityConfig from buildAgentService
PR 5421: ✅ refactor(api-proxy): decompose handleUpstreamResponse into focused helpers
GitHub API: ✅
GitHub.com connectivity: ✅
File I/O: ✅
BYOK inference: ✅

Running in direct BYOK mode (COPILOT_PROVIDER_API_KEY + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw)

Overall: PASS

🔑 BYOK (AOAI api-key) report filed by Smoke Copilot BYOK AOAI (api-key)

github-actions · 2026-06-23T14:55:43Z

🔭 Smoke Test: API Proxy OpenTelemetry Tracing

Scenario	Result	Notes
1. Module Loading	✅	`otel.js` loads; `isEnabled()=true`; exports 14 symbols incl. `startRequestSpan`, `setTokenAttributes`, `setBudgetAttributes`, `endSpan`, `endSpanError`, `shutdown`, `isEnabled`
2. Test Suite	✅	`otel.test.js`: 39 passed · `otel-fanout.test.js`: 20 passed (59 total, 0 failures)
3. Env Var Forwarding	✅	`api-proxy-service-config.ts` forwards `GH_AW_OTLP_ENDPOINTS`, `OTEL_EXPORTER_OTLP_ENDPOINT`, `OTEL_EXPORTER_OTLP_HEADERS`, `GITHUB_AW_OTEL_TRACE_ID`, `GITHUB_AW_OTEL_PARENT_SPAN_ID`, `OTEL_SERVICE_NAME` to the api-proxy container
4. Token Tracker Integration	✅	`onUsage` callback present in `token-tracker-http.js` (line 283); invoked at line 324 to deliver token data to `setTokenAttributes`
5. OTEL Diagnostics	✅	No OTLP endpoint configured → spans fall back to `/var/log/api-proxy/otel.jsonl` (expected graceful degradation path)

All scenarios pass. OTEL tracing integration is fully operational.

📡 OTel tracing validated by Smoke OTel Tracing

github-actions · 2026-06-23T14:55:52Z

🏗️ Build Test Suite Results

Ecosystem	Project	Build/Install	Tests	Status
Bun	elysia	✅	1/1 passed	✅ PASS
Bun	hono	✅	1/1 passed	✅ PASS
C++	fmt	✅	N/A	✅ PASS
C++	json	✅	N/A	✅ PASS
Deno	oak	N/A	1/1 passed	✅ PASS
Deno	std	N/A	1/1 passed	✅ PASS
.NET	hello-world	✅	N/A	✅ PASS
.NET	json-parse	✅	N/A	✅ PASS
Go	color	✅	1/1 passed	✅ PASS
Go	env	✅	1/1 passed	✅ PASS
Go	uuid	✅	1/1 passed	✅ PASS
Java	gson	✅	1/1 passed	✅ PASS
Java	caffeine	✅	1/1 passed	✅ PASS
Node.js	clsx	✅	All passed	✅ PASS
Node.js	execa	✅	All passed	✅ PASS
Node.js	p-limit	✅	All passed	✅ PASS
Rust	fd	✅	1/1 passed	✅ PASS
Rust	zoxide	✅	1/1 passed	✅ PASS

Overall: 8/8 ecosystems passed — ✅ PASS

Generated by Build Test Suite for issue #5415 · 39.8 AIC · ⊞ 7.7K · ◷

github-actions · 2026-06-23T14:55:57Z

Smoke Test Results: FAIL

Check	Result
Redis PING	❌ timeout (no response on `host.docker.internal:6379`)
PostgreSQL pg_isready	❌ no response on `host.docker.internal:5432`
PostgreSQL SELECT 1	❌ timeout

Overall: FAIL — host.docker.internal is not reachable from this runner. Service containers may not be running or the hostname is not resolvable in this environment.

🔌 Service connectivity validated by Smoke Services

github-actions · 2026-06-23T14:56:51Z

GitHub MCP Testing: ❌ (MCP tools not available)
GitHub.com Connectivity: ❌ (curl failed, exit code 35)
File Writing Testing: ✅
Bash Tool Testing: ✅
Overall status: FAIL

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

localhost

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "localhost"

See Network Configuration for more information.

💎 Faceted by Smoke Gemini

Copilot AI review requested due to automatic review settings June 22, 2026 21:33

Copilot started reviewing on behalf of lpcox June 22, 2026 21:34 View session

Copilot AI reviewed Jun 22, 2026

View reviewed changes

lpcox added the ready-for-aw label Jun 23, 2026

lpcox temporarily deployed to aoai-model June 23, 2026 14:50 — with GitHub Actions Inactive

This was referenced Jun 23, 2026

[aw] Security Guard has stale lock file #5430

Closed

[aw] Contribution Check has stale lock file #5431

Closed

github-actions Bot added the smoke-claude label Jun 23, 2026

github-actions Bot added the smoke-copilot-pat label Jun 23, 2026

github-actions Bot added the smoke-copilot label Jun 23, 2026

lpcox temporarily deployed to aoai-model June 23, 2026 14:53 — with GitHub Actions Inactive

github-actions Bot added the smoke-copilot-byok label Jun 23, 2026

github-actions Bot added the smoke-codex label Jun 23, 2026

github-actions Bot added the smoke-copilot-byok-aoai-entra label Jun 23, 2026

lpcox temporarily deployed to aoai-model June 23, 2026 14:54 — with GitHub Actions Inactive

github-actions Bot added the build-test label Jun 23, 2026

lpcox merged commit acd06ee into main Jun 23, 2026
86 of 89 checks passed

lpcox deleted the fix/copilot-business-auth-prefix branch June 23, 2026 15:31

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Conversation

lpcox commented Jun 22, 2026

Problem

Fix

Tests

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github-actions Bot commented Jun 22, 2026

✅ Coverage Check Passed

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github-actions Bot commented Jun 23, 2026

Smoke Test: Claude Engine Validation

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github-actions Bot commented Jun 23, 2026

🔥 Smoke Test: Copilot PAT — PASS

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🔭 Smoke Test: API Proxy OpenTelemetry Tracing

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🏗️ Build Test Suite Results

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Smoke Test Results: FAIL

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