From ac43fae035cfbddc6949d78375c105deb204bd99 Mon Sep 17 00:00:00 2001
From: Mikhail Perminov <mfperminov@mail.ru>
Date: Mon, 4 May 2026 23:42:39 +0300
Subject: [PATCH] core: handle empty proxy selector result

---
 .../java/io/grpc/internal/ProxyDetectorImpl.java  |  4 ++++
 .../io/grpc/internal/ProxyDetectorImplTest.java   | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java b/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java
index 58c7803346f..7995acf05cf 100644
--- a/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java
+++ b/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java
@@ -207,6 +207,10 @@ private ProxiedSocketAddress detectProxy(InetSocketAddress targetAddr) throws IO
     }
 
     List<Proxy> proxies = proxySelector.select(uri);
+    if (proxies == null || proxies.isEmpty()) {
+      log.log(Level.FINE, "No proxies returned, proceeding without proxy");
+      return null;
+    }
     if (proxies.size() > 1) {
       log.warning("More than 1 proxy detected, gRPC will select the first one");
     }
diff --git a/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java b/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java
index 771050f119d..8f33c947a15 100644
--- a/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java
+++ b/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java
@@ -40,6 +40,7 @@
 import java.net.ProxySelector;
 import java.net.SocketAddress;
 import java.net.URI;
+import java.util.Collections;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -191,4 +192,18 @@ public ProxySelector get() {
         authenticator);
     assertNull(proxyDetector.proxyFor(destination));
   }
+
+  @Test
+  public void returnNullWhenProxySelectorReturnsEmptyList() throws Exception {
+    when(proxySelector.select(any(URI.class))).thenReturn(Collections.<Proxy>emptyList());
+
+    assertNull(proxyDetector.proxyFor(destination));
+  }
+
+  @Test
+  public void returnNullWhenProxySelectorReturnsNullList() throws Exception {
+    when(proxySelector.select(any(URI.class))).thenReturn(null);
+
+    assertNull(proxyDetector.proxyFor(destination));
+  }
 }