arturobernalg commented on code in PR #619:
URL:
https://github.com/apache/httpcomponents-client/pull/619#discussion_r1979959165
##########
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:
> How can it happen that no explicit boundary is set? I mean you have to
deliberately call `#setBoundary(null)`?
Not setting a boundary—or explicitly setting it to null—signals that no
explicit value is provided, so the builder falls back to generating one (either
fixed or random based on configuration).
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