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feat: implement Streamable HTTP HttpClient transport and improve error handling (#337)

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- Add HttpClientStreamableHttpTransport implementing the 2025-03-26 MCP specification
- Add ResponseSubscribers utility for handling different HTTP response body types
- Refactor HttpClientSseClientTransport to use reactive streams instead of FlowSseClient
  - Remove FlowSseClient in favor of reactive stream patterns
  - Use Disposable-based connection management instead of CountDownLatch
  - Replace message endpoint discovery with Sinks.One approach
- Improve error handling by replacing doOnError/onErrorResume with onErrorComplete
- Add test coverage for new Streamable HTTP transport
- Add resiliency tests for connection handling and session invalidation

BREAKING CHANGE: FlowSseClient has been removed in favor of reactive streams

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Co-authored-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>
This commit is contained in:
Christian Tzolov 2025-06-13 07:05:47 +02:00
commit c711f8315a
2 changed files with 1601 additions and 394 deletions
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6
mcp-spring/mcp-spring-webflux/src/test/java/io/modelcontextprotocol/client/WebClientStreamableHttpAsyncClientTests.java
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@ -1,12 +1,12 @@
package io.modelcontextprotocol.client;
import io.modelcontextprotocol.client.transport.WebClientStreamableHttpTransport;
import io.modelcontextprotocol.spec.McpClientTransport;
import org.junit.jupiter.api.Timeout;
import org.springframework.web.reactive.function.client.WebClient;
import org.testcontainers.containers.GenericContainer;
import org.testcontainers.containers.wait.strategy.Wait;
import org.springframework.web.reactive.function.client.WebClient;
import io.modelcontextprotocol.client.transport.WebClientStreamableHttpTransport;
import io.modelcontextprotocol.spec.McpClientTransport;
@Timeout(15)
public class WebClientStreamableHttpAsyncClientTests extends AbstractMcpAsyncClientTests {

6
mcp-spring/mcp-spring-webflux/src/test/java/io/modelcontextprotocol/client/WebClientStreamableHttpSyncClientTests.java
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@ -1,12 +1,12 @@
package io.modelcontextprotocol.client;
import io.modelcontextprotocol.client.transport.WebClientStreamableHttpTransport;
import io.modelcontextprotocol.spec.McpClientTransport;
import org.junit.jupiter.api.Timeout;
import org.springframework.web.reactive.function.client.WebClient;
import org.testcontainers.containers.GenericContainer;
import org.testcontainers.containers.wait.strategy.Wait;
import org.springframework.web.reactive.function.client.WebClient;
import io.modelcontextprotocol.client.transport.WebClientStreamableHttpTransport;
import io.modelcontextprotocol.spec.McpClientTransport;
@Timeout(15)
public class WebClientStreamableHttpSyncClientTests extends AbstractMcpSyncClientTests {