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fix(auth): add Accept: application/json header to OAuth token requests #2754

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fix(auth): add Accept: application/json header to OAuth token requests #2754

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10 changes: 8 additions & 2 deletions src/mcp/client/auth/oauth2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -402,7 +402,10 @@ async def _exchange_token_authorization_code(
token_data["resource"] = self.context.get_resource_url() # RFC 8707

# Prepare authentication based on preferred method
headers = {"Content-Type": "application/x-www-form-urlencoded"}
headers = {
"Content-Type": "application/x-www-form-urlencoded",
"Accept": "application/json",
}
token_data, headers = self.context.prepare_token_auth(token_data, headers)

return httpx.Request("POST", token_url, data=token_data, headers=headers)
Expand Down Expand Up @@ -447,7 +450,10 @@ async def _refresh_token(self) -> httpx.Request:
refresh_data["resource"] = self.context.get_resource_url() # RFC 8707

# Prepare authentication based on preferred method
headers = {"Content-Type": "application/x-www-form-urlencoded"}
headers = {
"Content-Type": "application/x-www-form-urlencoded",
"Accept": "application/json",
}
refresh_data, headers = self.context.prepare_token_auth(refresh_data, headers)

return httpx.Request("POST", token_url, data=refresh_data, headers=headers)
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