epugh commented on code in PR #3710:
URL: https://github.com/apache/solr/pull/3710#discussion_r2528794773


##########
solr/solrj/src/java/org/apache/solr/client/solrj/impl/InputStreamResponseParser.java:
##########
@@ -38,14 +43,35 @@ public InputStreamResponseParser(String writerType) {
     this.writerType = writerType;
   }
 
+  /**
+   * When using a {@link InputStreamResponseParser}, the raw output is 
available in the response
+   * under the key {@link #STREAM_KEY}.
+   */
+  public static String consumeResponseToString(NamedList<Object> response) 
throws IOException {
+    assert response != null;
+    String output;
+    // Would be nice to validate the STREAM_KEY value is present
+    try (InputStream responseStream = (InputStream) response.get(STREAM_KEY)) {
+      ByteArrayOutputStream baos = new ByteArrayOutputStream();
+      responseStream.transferTo(baos);
+      output = baos.toString(StandardCharsets.UTF_8);
+    }
+    return output;
+  }
+
   @Override
   public String getWriterType() {
     return writerType;
   }
 
   @Override
-  public NamedList<Object> processResponse(InputStream body, String encoding) {
-    throw new UnsupportedOperationException();
+  public NamedList<Object> processResponse(InputStream body, String encoding) 
throws IOException {

Review Comment:
   ;-). I don't know that I would on this one.   The 
UnsupportedOperationException seems appropirate here as we no longer do this 
method.  Versus IOException...



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