httpclient5/src/main/java/org/apache/hc/client5/http/entity/mime/FormBodyPartBuilder.java [188:204]:
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        if (headerCopy.getField(MimeConsts.CONTENT_TYPE) == null) {
            final ContentType contentType;
            if (body instanceof AbstractContentBody) {
                contentType = ((AbstractContentBody) body).getContentType();
            } else {
                contentType = null;
            }
            if (contentType != null) {
                headerCopy.addField(new MimeField(MimeConsts.CONTENT_TYPE, contentType.toString()));
            } else {
                final StringBuilder buffer = new StringBuilder();
                buffer.append(this.body.getMimeType()); // MimeType cannot be null
                if (this.body.getCharset() != null) { // charset may legitimately be null
                    buffer.append("; charset=");
                    buffer.append(this.body.getCharset());
                }
                headerCopy.addField(new MimeField(MimeConsts.CONTENT_TYPE, buffer.toString()));
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httpclient5/src/main/java/org/apache/hc/client5/http/entity/mime/MultipartPartBuilder.java [100:116]:
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        if (headerCopy.getField(MimeConsts.CONTENT_TYPE) == null) {
            final ContentType contentType;
            if (body instanceof AbstractContentBody) {
                contentType = ((AbstractContentBody) body).getContentType();
            } else {
                contentType = null;
            }
            if (contentType != null) {
                headerCopy.addField(new MimeField(MimeConsts.CONTENT_TYPE, contentType.toString()));
            } else {
                final StringBuilder buffer = new StringBuilder();
                buffer.append(this.body.getMimeType()); // MimeType cannot be null
                if (this.body.getCharset() != null) { // charset may legitimately be null
                    buffer.append("; charset=");
                    buffer.append(this.body.getCharset());
                }
                headerCopy.addField(new MimeField(MimeConsts.CONTENT_TYPE, buffer.toString()));
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