feat: add the option to configure a proxy for the HTTP client

src/main/java/com/google/genai/ApiClient.java

@@ -30,6 +30,9 @@
 import com.google.genai.types.ClientOptions;
 import com.google.genai.types.HttpOptions;
 import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.Proxy;
+import java.net.SocketAddress;
 import java.time.Duration;
 import java.util.List;
 import java.util.Map;
@@ -233,7 +236,9 @@ private OkHttpClient createHttpClient(
           options.maxConnectionsPerHost().ifPresent(dispatcher::setMaxRequestsPerHost);
           builder.dispatcher(dispatcher);
         });
-
+    if (httpOptions != null) {
+      httpOptions.proxy().ifPresent(builder::proxy);
+    }
     return builder.build();
   }
 

src/main/java/com/google/genai/types/HttpOptions.java

@@ -23,6 +23,7 @@
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.google.auto.value.AutoValue;
 import com.google.genai.JsonSerializable;
+import java.net.Proxy;
 import java.util.Map;
 import java.util.Optional;
 
@@ -46,6 +47,10 @@ public abstract class HttpOptions extends JsonSerializable {
   @JsonProperty("timeout")
   public abstract Optional<Integer> timeout();
 
+  /** Proxy configuration for the HTTP requests. */
+  @JsonProperty("proxy")
+  public abstract Optional<Proxy> proxy();
+
   /**
    * Extra parameters to add to the request body. The structure must match the backend API's request
    * structure. - VertexAI backend API docs: https://cloud.google.com/vertex-ai/docs/reference/rest
@@ -103,6 +108,14 @@ private static Builder create() {
     @JsonProperty("timeout")
     public abstract Builder timeout(Integer timeout);
 
+    /**
+     * Setter for proxy.
+     *
+     * <p>proxy: Proxy configuration for the HTTP requests.
+     */
+    @JsonProperty("proxy")
+    public abstract Builder proxy(Proxy proxy);
+
     /**
      * Setter for extraBody.
      *