Default operation content encoding is unstable as it relies on the underlying OS's default

[pengliaoye]

class: AbstractOperationMessage

change

@Override
public String getContentAsString() {
	if (this.content.length > 0) {
		Charset charset = extractCharsetFromContentTypeHeader();
		return (charset != null) ? new String(this.content, charset) : new String(this.content);
	}
	return "";
}

to

@Override
public String getContentAsString() {
	if (this.content.length > 0) {
		Charset charset = extractCharsetFromContentTypeHeader();
		return (charset != null) ? new String(this.content, charset) : new String(this.content, "UTF-8");
	}
	return "";
}