michael-o commented on code in PR #556:
URL: 
https://github.com/apache/httpcomponents-client/pull/556#discussion_r1528412914


##########
httpclient5/src/main/java/org/apache/hc/client5/http/entity/mime/MultipartEntityBuilder.java:
##########
@@ -253,12 +253,13 @@ MultipartFormEntity buildEntity() {
         if (charsetCopy == null && contentType != null) {
             charsetCopy = contentType.getCharset();
         }
-        final List<NameValuePair> paramsList = new ArrayList<>(2);
-        paramsList.add(new BasicNameValuePair("boundary", boundaryCopy));
-        if (charsetCopy != null) {
-            paramsList.add(new BasicNameValuePair("charset", 
charsetCopy.name()));
-        }
-        final NameValuePair[] params = 
paramsList.toArray(EMPTY_NAME_VALUE_ARRAY);
+        // Previusly, "charset" parameter was added to the Content-Type 
header, however adding "charset=..."
+        // is not specified in RFC 7578, and it causes issues with (flawed?) 
HTTP servers.
+        // For instance:
+        //  
https://github.com/owasp-modsecurity/ModSecurity/commit/6e56950cdf258c9b39f12cf6eb014cb59797cfd3
+        //  https://github.com/akka/akka-http/issues/338
+        //  https://bz.apache.org/bugzilla/show_bug.cgi?id=61384
+        final NameValuePair[] params = new NameValuePair[]{new 
BasicNameValuePair("boundary", boundaryCopy)};

Review Comment:
   Agreed.



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