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fix: Add Accept header to auth metadata request #901

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fix: Add Accept header to auth metadata request #901

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3 changes: 2 additions & 1 deletion src/client/auth.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -887,7 +887,8 @@ describe('OAuth Authorization', () => {
const calls = mockFetch.mock.calls;
const [, options] = calls[0];
expect(options.headers).toEqual({
'MCP-Protocol-Version': '2025-01-01'
'MCP-Protocol-Version': '2025-01-01',
Accept: 'application/json'
});
});

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5 changes: 4 additions & 1 deletion src/client/auth.ts
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Expand Up @@ -735,7 +735,10 @@ export async function discoverAuthorizationServerMetadata(
protocolVersion?: string;
} = {}
): Promise<AuthorizationServerMetadata | undefined> {
const headers = { 'MCP-Protocol-Version': protocolVersion };
const headers = {
'MCP-Protocol-Version': protocolVersion,
Accept: 'application/json'
};

// Get the list of URLs to try
const urlsToTry = buildDiscoveryUrls(authorizationServerUrl);
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