Preflight Checklist
Type of behavior issue
Unexpected behavior with a specific LLM provider
What you asked the agent to do
Summary
Using Moltis with GitHub Copilot Enterprise tokens fails with HTTP 421 Misdirected Request because requests are sent to api.individual.githubcopilot.com. Enterprise tokens must use the proxy endpoint (proxy.enterprise.githubcopilot.com). Also, the proxy endpoint requires streaming for chat completions (stream: true); non‑streaming returns 400: "stream": false is not supported".
Steps to Reproduce
- Authenticate Moltis with a Copilot Enterprise account.
- Try any Copilot chat request.
- Observe failure.
Observed Behavior
https://api.individual.githubcopilot.com/models → HTTP 421 Misdirected Requesthttps://api.individual.githubcopilot.com/chat/completions → HTTP 421 Misdirected Request
Expected Behavior
- Enterprise tokens should be routed via proxy endpoint from token response (
proxy-ep / enterprise proxy).
- Chat completions should use streaming on the proxy endpoint.
Verified Workaround
- Use enterprise proxy:
GET https://proxy.enterprise.githubcopilot.com/models → 200 OKPOST https://proxy.enterprise.githubcopilot.com/chat/completions with stream: true → 200 OK
- Non‑streaming on proxy returns:
400: "stream": false is not supported"
Relevant Code
|
const GITHUB_DEVICE_CODE_URL: &str = "https://github.com/login/device/code"; |
|
const GITHUB_TOKEN_URL: &str = "https://github.com/login/oauth/access_token"; |
|
const COPILOT_TOKEN_URL: &str = "https://api.github.com/copilot_internal/v2/token"; |
|
const COPILOT_API_BASE: &str = "https://api.individual.githubcopilot.com"; |
|
const COPILOT_MODELS_ENDPOINT: &str = "https://api.individual.githubcopilot.com/models"; |
Currently hardcodes:
https://api.individual.githubcopilot.com/...- Headers:
Editor-Version: vscode/1.96.2User-Agent: GitHubCopilotChat/0.26.7
Suggested Fix
- Use
proxy-ep from the token response when present (enterprise tokens).
- Route requests to enterprise proxy endpoint.
- Ensure streaming for chat/completions on enterprise proxy (non‑streaming returns 400).
- Keep
api.individual.githubcopilot.com for non‑enterprise tokens.
Additional Notes
- Updating headers to newer versions didn’t fix 421:
Editor-Version: vscode/1.110.1User-Agent: GitHubCopilotChat/0.38.2
Can you reproduce this?
Yes, every time with the same prompt
LLM provider and model
Copilot
Moltis version
0.10.17
Preflight Checklist
Type of behavior issue
Unexpected behavior with a specific LLM provider
What you asked the agent to do
Summary
Using Moltis with GitHub Copilot Enterprise tokens fails with
HTTP 421 Misdirected Requestbecause requests are sent toapi.individual.githubcopilot.com. Enterprise tokens must use the proxy endpoint (proxy.enterprise.githubcopilot.com). Also, the proxy endpoint requires streaming for chat completions (stream: true); non‑streaming returns400: "stream": false is not supported".Steps to Reproduce
Observed Behavior
https://api.individual.githubcopilot.com/models→HTTP 421 Misdirected Requesthttps://api.individual.githubcopilot.com/chat/completions→HTTP 421 Misdirected RequestExpected Behavior
proxy-ep/ enterprise proxy).Verified Workaround
GET https://proxy.enterprise.githubcopilot.com/models→200 OKPOST https://proxy.enterprise.githubcopilot.com/chat/completionswith stream: true →200 OK400: "stream": false is not supported"Relevant Code
moltis/crates/providers/src/github_copilot.rs
Lines 33 to 37 in 1fd772d
Currently hardcodes:
https://api.individual.githubcopilot.com/...Editor-Version: vscode/1.96.2User-Agent: GitHubCopilotChat/0.26.7Suggested Fix
proxy-epfrom the token response when present (enterprise tokens).api.individual.githubcopilot.comfor non‑enterprise tokens.Additional Notes
Editor-Version: vscode/1.110.1User-Agent: GitHubCopilotChat/0.38.2Can you reproduce this?
Yes, every time with the same prompt
LLM provider and model
Copilot
Moltis version
0.10.17