ok2c commented on code in PR #619:
URL: 
https://github.com/apache/httpcomponents-client/pull/619#discussion_r1980079460


##########
httpclient5/src/main/java/org/apache/hc/client5/http/entity/mime/MultipartEntityBuilder.java:
##########
@@ -29,40 +29,53 @@
 
 import java.io.File;
 import java.io.InputStream;
-import java.nio.CharBuffer;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
-import java.util.concurrent.ThreadLocalRandom;
+import java.util.UUID;
 
 import org.apache.hc.core5.http.ContentType;
 import org.apache.hc.core5.http.HttpEntity;
 import org.apache.hc.core5.http.NameValuePair;
 import org.apache.hc.core5.http.message.BasicNameValuePair;
 import org.apache.hc.core5.util.Args;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Builder for multipart {@link HttpEntity}s.
+ * <p>
+ * This class constructs multipart entities with a boundary determined by 
either a fixed
+ * value ("httpclient_boundary_7k9p2m4x8n5j3q6t1r0vwyzabcdefghi") or a random 
UUID. If no
+ * boundary is explicitly set via {@link #setBoundary(String)}, it defaults to 
the fixed
+ * value unless {@link #withRandomBoundary()} is called to request a random 
UUID at build
+ * time. Users can provide a custom boundary with {@link 
#setBoundary(String)}. A warning
+ * is logged when no explicit boundary is set via {@link 
#setBoundary(String)}, encouraging

Review Comment:
   > Exactly, what is the point in setting null?
   
   @michael-o This is like saying "use default" / "I do not care".



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