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

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Stephen Halter 2025-06-17 14:27:26 -07:00 • committed by GitHub
commit befa31d5c9
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1 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));
}
}