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Send MCP-Protocol-Version header in Streamable HTTP client transport (#500)

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This commit is contained in:
Stephen Halter 2025-06-17 14:27:26 -07:00 • committed by GitHub
commit befa31d5c9
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4 changed files with 69 additions and 24 deletions
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35
tests/ModelContextProtocol.AspNetCore.Tests/MapMcpStreamableHttpTests.cs
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@ -1,5 +1,6 @@
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Primitives;
using ModelContextProtocol.Client;
namespace ModelContextProtocol.AspNetCore.Tests;
@ -143,4 +144,38 @@ public class MapMcpStreamableHttpTests(ITestOutputHelper outputHelper) : MapMcpT
Assert.Equal("SseTestServer", mcpClient.ServerInfo.Name);
}
[Fact]
public async Task StreamableHttpClient_SendsMcpProtocolVersionHeader_AfterInitialization()
{
var protocolVersionHeaderValues = new List<string?>();
Builder.Services.AddMcpServer().WithHttpTransport(ConfigureStateless).WithTools<EchoHttpContextUserTools>();
await using var app = Builder.Build();
app.Use(next =>
{
return async context =>
{
if (!StringValues.IsNullOrEmpty(context.Request.Headers["mcp-session-id"]))
{
protocolVersionHeaderValues.Add(context.Request.Headers["mcp-protocol-version"]);
}
await next(context);
};
});
app.MapMcp();
await app.StartAsync(TestContext.Current.CancellationToken);
await using var mcpClient = await ConnectAsync();
await mcpClient.ListToolsAsync(cancellationToken: TestContext.Current.CancellationToken);
// The header should be included in the GET request, the initialized notification, and the tools/list call.
Assert.Equal(3, protocolVersionHeaderValues.Count);
Assert.All(protocolVersionHeaderValues, v => Assert.Equal("2025-03-26", v));
}
}

2
tests/ModelContextProtocol.AspNetCore.Tests/MapMcpTests.cs
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@ -195,7 +195,7 @@ public abstract class MapMcpTests(ITestOutputHelper testOutputHelper) : KestrelI
"TestAuthType", "name", "role"));
[McpServerToolType]
private class EchoHttpContextUserTools(IHttpContextAccessor contextAccessor)
protected class EchoHttpContextUserTools(IHttpContextAccessor contextAccessor)
{
[McpServerTool, Description("Echoes the input back to the client with their user name.")]
public string EchoWithUserName(string message)

1
tests/ModelContextProtocol.AspNetCore.Tests/ModelContextProtocol.AspNetCore.Tests.csproj
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@ -4,7 +4,6 @@
<TargetFrameworks>net9.0;net8.0</TargetFrameworks>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<LangVersion>Latest</LangVersion>
<IsPackable>false</IsPackable>
<IsTestProject>true</IsTestProject>
<RootNamespace>ModelContextProtocol.AspNetCore.Tests</RootNamespace>

1
tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
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@ -5,7 +5,6 @@
<TargetFrameworks>net9.0;net8.0</TargetFrameworks>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<LangVersion>Latest</LangVersion>
<IsPackable>false</IsPackable>
<IsTestProject>true</IsTestProject>