[TEST] Custom endpoints support in FHIR gateway

exec/src/main/java/com/google/fhir/gateway/MainApp.java

@@ -19,7 +19,7 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.servlet.ServletComponentScan;
 
-@SpringBootApplication(scanBasePackages = {"com.google.fhir.gateway.plugin"})
+@SpringBootApplication(scanBasePackages = {"com.google.fhir.gateway"})
 @ServletComponentScan(basePackages = "com.google.fhir.gateway")
 public class MainApp {
 

exec/src/main/java/com/google/fhir/gateway/TestRestController.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2021-2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.fhir.gateway;
+
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class TestRestController {
+
+  @PostMapping("/Test")
+  String test(@RequestBody String data) {
+    return "Testing";
+  }
+}

server/src/main/java/com/google/fhir/gateway/FhirProxyServer.java

@@ -32,7 +32,7 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.cors.CorsConfiguration;
 
-@WebServlet("/*")
+@WebServlet(urlPatterns = {"/fhir/*"})
 public class FhirProxyServer extends RestfulServer {
 
   private static final Logger logger = LoggerFactory.getLogger(FhirProxyServer.class);