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feat(mcp): webflux support custom http header #169

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21 changes: 21 additions & 0 deletions ...lux/src/main/java/io/modelcontextprotocol/client/transport/WebFluxSseClientTransport.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@

import java.io.IOException;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;

import com.fasterxml.jackson.core.type.TypeReference;
Expand All @@ -16,6 +17,7 @@
import io.modelcontextprotocol.util.Assert;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpHeaders;
import reactor.core.Disposable;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
Expand Down Expand Up @@ -235,6 +237,24 @@ else if (MESSAGE_EVENT_TYPE.equals(event.event())) {
*/
@Override
public Mono<Void> sendMessage(JSONRPCMessage message) {
return sendMessage(message, httpHeaders -> {
});
}

/**
* Sends a JSON-RPC message to the server using the endpoint provided during
* connection.
*
* <p>
* Messages are sent via HTTP POST requests to the server-provided endpoint URI. The
* message is serialized to JSON before transmission. If the transport is in the
* process of closing, the message send operation is skipped gracefully.
* @param message the JSON-RPC message to send
* @param modifiableHeaders a consumer that allows modifying the HTTP headers
* @return a Mono that completes when the message has been sent successfully
* @throws RuntimeException if message serialization fails
*/
public Mono<Void> sendMessage(JSONRPCMessage message, Consumer<HttpHeaders> modifiableHeaders) {
// The messageEndpoint is the endpoint URI to send the messages
// It is provided by the server as part of the endpoint event
return messageEndpointSink.asMono().flatMap(messageEndpointUri -> {
Expand All @@ -245,6 +265,7 @@ public Mono<Void> sendMessage(JSONRPCMessage message) {
String jsonText = this.objectMapper.writeValueAsString(message);
return webClient.post()
.uri(messageEndpointUri)
.headers(modifiableHeaders)
.contentType(MediaType.APPLICATION_JSON)
.bodyValue(jsonText)
.retrieve()
Expand Down