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WWW-Authenticate header does not contain a resource metadata params

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
48/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
冷清
技术栈
csharp
领域
api, authentication

调研方向

从 ClientOAuthProvider.ExtractProtectedResourceMetadata 开始，并在堆栈跟踪中跟踪其从 PerformOAuthAuthorizationAsync 发起的调用。复现 Atlassian Remote MCP Server 返回的 401 响应，然后验证当 WWW-Authenticate 不包含 resource_metadata 参数时，OAuth 授权服务器元数据发现仍可继续进行。

由索引模型根据 Issue 内容生成。

描述

area-auth bug P2

Describe the bug
I attempted to connect to the Atlassian Remote MCP Server (https://mcp.atlassian.com/v1/sse) using HttpClientTransport and successfully initialized the client. However, I’m encountering an issue that appears after the initial handshake. The 401-response header’s WWW-Authenticate field does not include the resource metadata parameters. This behavior is present with some other remote MCP servers that also no resource metadata.

I haven’t found a way to bypass this resource metadata check and proceed directly to the authorization server metadata discovery, even though this remote MCP server exposes it at:
https://mcp.atlassian.com/.well-known/oauth-authorization-server

To Reproduce
Steps to reproduce the behavior:

  1. Create HttpTransportClient with OAuth.
  2. Initialized the client.

Logs

Unhandled exception. ModelContextProtocol.McpException: The WWW-Authenticate header does not contain a resource_metadata parameter
   at ModelContextProtocol.Authentication.ClientOAuthProvider.ExtractProtectedResourceMetadata(HttpResponseMessage response, Uri serverUrl, CancellationToken cancellationToken)
   at ModelContextProtocol.Authentication.ClientOAuthProvider.PerformOAuthAuthorizationAsync(HttpResponseMessage response, CancellationToken cancellationToken)
   at ModelContextProtocol.Authentication.ClientOAuthProvider.HandleUnauthorizedResponseAsync(String scheme, HttpResponseMessage response, CancellationToken cancellationToken)
   at ModelContextProtocol.Authentication.AuthenticatingMcpHttpClient.HandleUnauthorizedResponseAsync(HttpRequestMessage originalRequest, JsonRpcMessage originalJsonRpcMessage, HttpResponseMessage response, CancellationToken cancellationToken)
   at ModelContextProtocol.Authentication.AuthenticatingMcpHttpClient.SendAsync(HttpRequestMessage request, JsonRpcMessage message, CancellationToken cancellationToken)
   at ModelContextProtocol.Client.StreamableHttpClientSessionTransport.SendHttpRequestAsync(JsonRpcMessage message, CancellationToken cancellationToken)
   at ModelContextProtocol.Client.AutoDetectingClientSessionTransport.InitializeAsync(JsonRpcMessage message, CancellationToken cancellationToken)
   at ModelContextProtocol.Client.AutoDetectingClientSessionTransport.InitializeAsync(JsonRpcMessage message, CancellationToken cancellationToken)
   at ModelContextProtocol.McpSessionHandler.SendRequestAsync(JsonRpcRequest request, CancellationToken cancellationToken)
   at ModelContextProtocol.McpSession.SendRequestAsync[TParameters,TResult](String method, TParameters parameters, JsonTypeInfo`1 parametersTypeInfo, JsonTypeInfo`1 resultTypeInfo, RequestId requestId, CancellationToken cancellationToken)
   at ModelContextProtocol.Client.McpClientImpl.ConnectAsync(CancellationToken cancellationToken)
   at ModelContextProtocol.Client.McpClientImpl.ConnectAsync(CancellationToken cancellationToken)
   at ModelContextProtocol.Client.McpClient.CreateAsync(IClientTransport clientTransport, McpClientOptions clientOptions, ILoggerFactory loggerFactory, CancellationToken cancellationToken)
   at ModelContextProtocol.Client.McpClient.CreateAsync(IClientTransport clientTransport, McpClientOptions clientOptions, ILoggerFactory loggerFactory, CancellationToken cancellationToken)
主要语言
C#
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环境准备

从这里开始

  1. 先读完整个 Issue，再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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