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fix(auth): enforce form-urlencoded Content-Type for token endpoint #1774

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fix(auth): enforce form-urlencoded Content-Type for token endpoint #1774

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fix(auth): enforce form-urlencoded Content-Type for token endpoint
lanxevo3 Mar 26, 2026
984a27e
Merge branch 'main' of https://github.com/lanxevo3/typescript-sdk
lanxevo3 Mar 26, 2026
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4 changes: 4 additions & 0 deletions packages/client/src/client/auth.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1439,6 +1439,10 @@ export async function executeTokenRequest(
applyClientAuthentication(authMethod, clientInformation as OAuthClientInformation, headers, tokenRequestParams);
}

// Ensure Content-Type is always form-urlencoded for the token endpoint (OAuth 2.1 §3.2).
// Some addClientAuthentication implementations may have inadvertently set a different value.
headers.set('Content-Type', 'application/x-www-form-urlencoded');

const response = await (fetchFn ?? fetch)(tokenUrl, {
method: 'POST',
headers,
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