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0.90.0 release notes

12th August 2019

New features

You can now send an HTTP request to an absolute URI, which means you don't need to create different HttpClients for different hosts. #1143 #1343 #1961

HttpClient client = HttpClient.of(); // No base URI specified.
client.get("http://foo.com").aggregate().join();
client.execute(RequestHeaders.of(HttpMethod.GET, "http://bar.com")).aggregate().join();

HttpClient client = HttpClient.of("http://baz.com"); // Base URI specified.
client.get("/index.html").aggregate().join();
client.get("http://qux.com").aggregate().join(); // Can override the base URI.

HealthCheckedEndpointGroup has been revamped and now supports long-polling when used with Armeria's HealthCheckService. #1948 #1977 #1982

Long-polling support enables HealthCheckedEndpointGroup to detect the server health changes immediately with much fewer number of health check requests.
Long-polling support is auto-detected based on a special HTTP header armeria-lphc, so it is fully backward-compatible with ordinary non-Armeria health check services.

EndpointGroup group =
    HealthCheckedEndpointGroup.of(
        new StaticEndpointGroup(Endpoint.of("foo.com", 8080),
                                Endpoint.of("bar.com", 8080)),
        "/internal/l7check");
EndpointGroupRegistry.register("myGroup", group,
                               EndpointSelectionStrategy.WEIGHTED_ROUND_ROBIN);
HttpClient client = HttpClient.of("http://group:myGroup");
client.get("/").aggregate().join();

You can now send a delayed response easily using HttpResponse.delayed(), which may be useful when simulating a slow server. #1935

Server server = new ServerBuilder()
    .service("/delayed", (ctx, req) -> HttpResponse.delayed(HttpResponse.of(200),
                                                            Duration.ofSeconds(3)))
    .build();

You can now write a mock HTTP server using MockWebServerExtension and JUnit 5. #1884 #1935

class MyTest {
    @RegisterExtension
    static MockWebServerExtension server = new MockWebServerExtension();

    @Test
    void test() {
        server.enqueue(HttpResponse.of(200));
        HttpResponse actualRes = HttpClient.of(server.httpUri("/")).get("/");
        assertThat(actualRes.aggregate().join().status().code()).isEqualTo(200);
    }
}

AsyncCloseable has been added to provide an asynchronous close operation. #1948

public class IAmCloseable implements AutoCloseable, AsyncCloseable {
    @Override
    public CompletableFuture<?> closeAsync() {
        ...
    }

    @Override
    public void close() {
        closeAsync().join();
    }
}

You can now specify an EventExecutor when using HttpResponse.from(). #1937

You can now suppress the false warnings from RequestContextCurrentTraceContext by using setCurrentThreadNotRequestThread() #1971 #1980

For example, you could prevent warnings from the administrative threads controlled by ThreadFactory like the following:

ThreadFactory factory = (runnable) -> new Thread(new Runnable() {
    @Override
    public void run() {
        RequestContextCurrentTraceContext.setCurrentThreadNotRequestThread(true);
        runnable.run();
    }

    @Override
    public String toString() {
        return runnable.toString();
    }
});

Bug fixes

RequestLog.responseCause() is now recorded correctly for client requests. #1977
RetryingClient now respects the Endpoint selection order, which was broken since 0.89.0. #1973 #1974
The health checked requests sent by HealthCheckedEndpointGroup are now sent at the correct interval, even if an endpoint is not responsive. #1948
ClosedPublisherException is not raised anymore when HttpResponse is aborted by the client who issued the request. #1962
Armeria gRPC client now sends the TE header, whose absence caused interoperability issues with some gRPC servers, such as Python gRPC server. #1963 #1965
Armeria HTTP client does not send more than two Host headers for HTTP/1 anymore. #1942
HealthCheckedEndpointGroup now waits until the initial Endpoints are available from its delegate group. #1940

Deprecations

HealthCheckedEndpointGroupBuilder.retryInterval() has been un-deprecated. #1948
HealthCheckedEndpointGroupBuilder.healthCheckPort() has been deprecated in favor of port(). #1948
CircuitBreakerBuilder.circuitBreakerMapping() has been deprecated in favor of mapping(). #1970

Breaking changes

HttpHealthCheckedEndpointGroup has been renamed to HealthCheckedEndpointGroup.
- The old HealthCheckedEndpointGroup has been renamed to AbstractHealthCheckedEndpointGroup, and is now extensible enough for you to implement your own health-checking mechanism, such as sending a gRPC/Thrift call.

Dependencies