default RestClientPreparation get(String path) {
        return path(HttpMethod.GET, path);
    }
Sets an {@link HttpMethod#GET} and the {@code path} and returns a fluent request builder.
<pre>{@code
RestClient restClient = RestClient.of("...");
CompletableFuture<ResponseEntity<Customer>> response =
    restClient.get("/api/v1/customers/{customerId}")
              .pathParam("customerId", "0000001")
              .execute(Customer.class);
}</pre>
core/src/main/java/com/linecorp/armeria/client/RestClient.java