ProxiedResponseError [FetchResponseError]: HTTP 200 response does not appear to originate from GitHub. Is a proxy or firewall intercepting this request?
Quick fix
Verify the account session, API key, provider settings, and environment where the failing tool is running.
Updated
Verification status
Source-backed
Evidence
2 public source URLs
Before you change production
This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.
Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for GitHub Copilot, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.
What this error means
ProxiedResponseError [FetchResponseError]: HTTP 200 response does not appear to originate from GitHub. Is a proxy or firewall intercepting this request? is a GitHub Copilot failure pattern reported for developers trying to fix github copilot authentication failure with http 200 response origin error on macos. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
GitHub issues github/copilot.vim#282 and #283 (May 8-10, 2026): Copilot language server throws ProxiedResponseError during auth/embedding type fetch even without proxy configured. Related to npx upgrade (11.12.1) and response content-type validation. Affects Neovim + copilot.vim and Zed on macOS. Category: GitHub Copilot (subscription auth failure).
Common causes
GitHub issues github/copilot.vim#282 and #283 (May 8-10, 2026): Copilot language server throws ProxiedResponseError during auth/embedding type fetch even without proxy configured. Related to npx upgrade (11.12.1) and response content-type validation. Affects Neovim + copilot.vim and Zed on macOS. Category: GitHub Copilot (subscription auth failure).
Quick fixes
Confirm the exact error signature matches ProxiedResponseError [FetchResponseError]: HTTP 200 response does not appear to originate from GitHub. Is a proxy or firewall intercepting this request?.
Check the GitHub Copilot account, local tool state, and provider configuration involved in the failing workflow.
Verify the account session, API key, provider settings, and environment where the failing tool is running.
Platform/tool-specific checks
Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.
Step-by-step troubleshooting
Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.
How to prevent it
Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.
Diagnostic flow for this page
Match ProxiedResponseError [FetchResponseError]: HTTP 200 response does not appear to originate from GitHub. Is a proxy or firewall intercepting this request? exactly before applying the quick fix.
Compare the failing environment with GitHub Copilot versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.