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fix: improve error handling in HttpClientSseClientTransport and add test

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- Include response body in error messages for better debugging
- Change sendHttpPost return type from HttpResponse<Void> to HttpResponse<String>
- Use BodyHandlers.ofString() instead of discarding response body
- Add testErrorOnBogusMessage test to verify error handling for invalid JSON-RPC messages
- Test validates that malformed messages return 400 status with descriptive error message

Replace #361

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

Co-authored-by: jkma <jkma@trip.com>
This commit is contained in:
Christian Tzolov 2025-07-13 10:47:33 +02:00 • committed by Christian Tzolov
commit b678de6514
1 changed files with 14 additions and 4 deletions
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8
mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
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@ -424,8 +424,8 @@ public class HttpClientSseClientTransport implements McpClientTransport {
.flatMap(body -> sendHttpPost(messageEndpointUri, body).handle((response, sink) -> {
if (response.statusCode() != 200 && response.statusCode() != 201 && response.statusCode() != 202
&& response.statusCode() != 206) {
sink.error(new RuntimeException(
"Sending message failed with a non-OK HTTP code: " + response.statusCode()));
sink.error(new RuntimeException("Sending message failed with a non-OK HTTP code: "
+ response.statusCode() + " - " + response.body()));
}
else {
sink.next(response);
@ -453,7 +453,7 @@ public class HttpClientSseClientTransport implements McpClientTransport {
});
}
private Mono<HttpResponse<Void>> sendHttpPost(final String endpoint, final String body) {
private Mono<HttpResponse<String>> sendHttpPost(final String endpoint, final String body) {
final URI requestUri = Utils.resolveUri(baseUri, endpoint);
final HttpRequest request = this.requestBuilder.copy()
.uri(requestUri)
@ -461,7 +461,7 @@ public class HttpClientSseClientTransport implements McpClientTransport {
.build();
// TODO: why discard the body?
return Mono.fromFuture(httpClient.sendAsync(request, HttpResponse.BodyHandlers.discarding()));
return Mono.fromFuture(httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString()));
}
/**