fix(github-copilot): request identity-encoded API responses

CHANGELOG.md

@@ -6,6 +6,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Providers/GitHub Copilot: request identity-encoded Copilot API responses across token exchange, catalog, model calls, usage, and embeddings so compressed Business-account error payloads no longer reach JSON parsers as gzip bytes. Fixes #82871. Thanks @tonyfe01.
 - Agents/diagnostics: split slow embedded-run `attempt-dispatch` startup summaries into workspace, prompt, runtime-plan, and final dispatch subspans so traces identify the delayed setup phase. Fixes #82782. (#82783) Thanks @galiniliev.
 - CLI/media: accept HTTP(S) URLs in `openclaw infer image describe --file`, fetching remote images through the guarded media path instead of treating URLs as local files. Fixes #82837. (#82854) Thanks @neeravmakwana.
 - Agents/subagents: keep session-backed parent runs active when the child wait call times out before the child session has actually settled, so late subagent completions are reconciled instead of being lost. Fixes #82787. Thanks @ramitrkar-hash.

extensions/github-copilot/embeddings.test.ts

@@ -244,6 +244,7 @@ describe("githubCopilotMemoryEmbeddingProviderAdapter", () => {
 
     const discoveryCall = firstDiscoveryRequest();
     expect(discoveryCall.url).toBe("https://proxy.example/v1/models");
+    expect(discoveryCall.init.headers["Accept-Encoding"]).toBe("identity");
     expect(discoveryCall.init.headers["X-Proxy-Token"]).toBe("proxy");
   });
 

extensions/github-copilot/models.test.ts

@@ -412,6 +412,10 @@ describe("github-copilot token", () => {
 
     expect(res.token).toBe("fresh;proxy-ep=https://proxy.contoso.test;");
     expect(res.baseUrl).toBe("https://api.contoso.test");
+    const [, calledInit] = fetchImpl.mock.calls[0] ?? [];
+    expect(((calledInit as RequestInit).headers as Record<string, string>)["Accept-Encoding"]).toBe(
+      "identity",
+    );
     expect(jsonStoreMocks.saveJsonFile).toHaveBeenCalledTimes(1);
   });
 });
@@ -537,6 +541,9 @@ describe("fetchCopilotModelCatalog", () => {
     expect(((calledInit as RequestInit).headers as Record<string, string>).Authorization).toBe(
       "Bearer tid=test",
     );
+    expect(((calledInit as RequestInit).headers as Record<string, string>)["Accept-Encoding"]).toBe(
+      "identity",
+    );
 
     expect(out.map((m) => m.id)).toEqual([
       "gpt-5.5",

extensions/github-copilot/stream.test.ts

@@ -64,6 +64,7 @@ describe("wrapCopilotAnthropicStream", () => {
       messages,
       hasImages: true,
     });
+    expect(expectedCopilotHeaders["Accept-Encoding"]).toBe("identity");
 
     void wrapped(
       {

src/plugin-sdk/provider-auth.ts

@@ -122,6 +122,7 @@ export function buildCopilotIdeHeaders(
   } = {},
 ): Record<string, string> {
   return {
+    "Accept-Encoding": "identity",
     "Editor-Version": COPILOT_EDITOR_VERSION,
     "Editor-Plugin-Version": COPILOT_EDITOR_PLUGIN_VERSION,
     "User-Agent": COPILOT_USER_AGENT,