Incorrect URLs formed if base URL contains a path segment

(Tested with influxdb-java version 2.5)

We're using a HTTPS reverse proxy in front our influxdb instance.

The external URLs is https://scala-ci.typesafe.com/influx/write.

The URL actually generated by influxdb-java is https://scala-ci.typesafe.com/write.

I believe that changing @POST("/write") to @POST("write"), etc, in InfluxDBService.java would fix this, but haven't verified.

A workaround is to add an interceptor to fixup the URL.

        OkHttpClient.Builder client = new OkHttpClient.Builder();
        client.addNetworkInterceptor(chain -> {
            HttpUrl.Builder fixedUrl = chain.request().url().newBuilder().encodedPath("/influx/" + chain.request().url().encodedPath().replaceFirst("/influxdb", ""));
            return chain.proceed(chain.request().newBuilder().url(fixedUrl.build()).build());
        });
        InfluxDB influxDB = InfluxDBFactory.connect("https://scala-ci.typesafe.com/influx/", user, password, client);

Start by reading InfluxDBService.java and tracing how its endpoint annotations combine with a base URL containing /influx. Reproduce the reported request against https://scala-ci.typesafe.com/influx/ and verify that generated URLs preserve the base path segment without requiring the interceptor workaround.