HTTP/2 not properly supported for PUT requests about wiremock

[mdeinum]

The Spring RestClient is nothing more then a wrapper, however internally it will use a Streaming Request and not a plain String or other simple type.

Rewriting the code to use something streaming makes it fail with a plain HttpClient as well.

var client = HttpClient.newHttpClient();
var body = new ObjectMapper().writeValueAsBytes(new SomeRequest(16));
var publisher = HttpRequest.BodyPublishers.ofByteArray(body, 0, body.length);
var request = HttpRequest.newBuilder().
  .uri(URI.create(runtimeInfo.getHttpBaseUrl() + "/something"))
  .header("Content-Type", "application/json")
  .PUT(HttpRequest.BodyPublishers.fromPublisher(publisher))
  .build();

var response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());

Result: java.io.IOException: EOF reached while reading

I've attached the logging for the HttpClient maybe that can shed some light. The output for both the RestClient or plain HttpClient is the same as well as the end result.

logging-when-eof.txt

UPDATE: Fails with a simple byte[] as well in the exact same manner.

[nut-3]

If I'm not mistaken there are no implementations of HTTP/2 without TLS. So my guess is that you set up a http stub that is served with HTTP/1.1. So it might be Java HttpClient's bug for not downgrading to HTTP/1.1 on non-TLS connection or not handling failed upgrade attempt properly. Or maybe underlying Jetty is not configured to use h2c for not-TLS HTTP/2 connections (probably need some configuration to enable it).
Actually, your code can be changed to use only one ClientHttpRequestFactory:

        return RestClient.builder()
                .requestFactory(new JdkClientHttpRequestFactory(HttpClient.newBuilder()
                        .version(HttpClient.Version.HTTP_1_1)
                        .build()))
                .baseUrl(properties.baseUrl())
                .build();

and it works.

[wimdeblauwe]

The point is that Wiremock is that HTTP stub and forcing HTTP/1.1 should not be needed.

[nut-3]

Well, I can only add that I could not reproduce error by using plain Jdk HttpClient like this:

        var httpClient = HttpClient.newHttpClient();
        HttpResponse<String> response = httpClient.send(HttpRequest.newBuilder()
                        .uri(new URI(runtimeInfo.getHttpBaseUrl() + "/something"))
                        .header("Content-Type", "application/json")
                        .PUT(HttpRequest.BodyPublishers.ofString("{ \"data\": \"test\" }"))
                        .build(),
                HttpResponse.BodyHandlers.ofString()
        );

Same using sendAsync(). Maybe error has something to do with Spring RestClient usage of HttpClient.