Set API host idle timeout to 25 seconds by default instead of no timeout. See jetty/jetty.project#3891

PiperOrigin-RevId: 731360214
Change-Id: Ifedd44381e45a318ab38705d910ba3f41317ee79

Author: ludoch

runtime/runtime_impl_jetty12/src/main/java/com/google/apphosting/runtime/http/JettyHttpApiHostClient.java

@@ -72,6 +72,16 @@ private JettyHttpApiHostClient(String url, HttpClient httpClient, Config config)
   static JettyHttpApiHostClient create(String url, Config config) {
     Preconditions.checkNotNull(url);
     HttpClient httpClient = new HttpClient();
+    long idleTimeout = 25000; // 25 seconds, should be less than 30 or 60 used server-side.
+    String envValue = System.getenv("APPENGINE_API_CALLS_IDLE_TIMEOUT_MS");
+    if (envValue != null) {
+      try {
+        idleTimeout = Long.parseLong(envValue);
+      } catch (NumberFormatException e) {
+        logger.atWarning().withCause(e).log("Invalid idle timeout value: %s", envValue);
+      }
+    }
+    httpClient.setIdleTimeout(idleTimeout);
     String schedulerName =
         HttpClient.class.getSimpleName() + "@" + httpClient.hashCode() + "-scheduler";
     ClassLoader myLoader = JettyHttpApiHostClient.class.getClassLoader();

runtime/runtime_impl_jetty9/src/main/java/com/google/apphosting/runtime/http/JettyHttpApiHostClient.java

@@ -72,6 +72,16 @@ private JettyHttpApiHostClient(String url, HttpClient httpClient, Config config)
   static JettyHttpApiHostClient create(String url, Config config) {
     Preconditions.checkNotNull(url);
     HttpClient httpClient = new HttpClient();
+    long idleTimeout = 25000; // 25 seconds, should be less than 30 or 60 used server-side.
+    String envValue = System.getenv("APPENGINE_API_CALLS_IDLE_TIMEOUT_MS");
+    if (envValue != null) {
+      try {
+        idleTimeout = Long.parseLong(envValue);
+      } catch (NumberFormatException e) {
+        logger.atWarning().withCause(e).log("Invalid idle timeout value: %s", envValue);
+      }
+    }
+    httpClient.setIdleTimeout(idleTimeout);
     String schedulerName =
         HttpClient.class.getSimpleName() + "@" + httpClient.hashCode() + "-scheduler";
     ClassLoader myLoader = JettyHttpApiHostClient.class.getClassLoader();