Netty中每个字符的响应有2个字节

Question

In Netty, I create a response by feeding a String in body :

        DefaultFullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, httpResponse.getHttpResponseStatus());
        if (body != null) {
            ByteBuf buf = Unpooled.copiedBuffer(body, CharsetUtil.UTF_8);
            res.content().writeBytes(buf);
            buf.release();
            res.headers().set(HttpHeaderNames.CONTENT_LENGTH, res.content().readableBytes());
        }

When I look at the response, I see content-length being twice the length of the characters in the String. I understand the Java String contains 2 bytes per character, but I can't figure out how to prevent this in Netty when returning the request.

When I look at Cloudflare responses, these contain one byte per character. So there must be a way to change this. Ideas?

Answer 1

As @Chris O'Toole shows in How to convert a netty ByteBuf to a String and vice versa we must

• first convert the String to Byte Array using the desired charset (UTF-8 works fine) String.getBytes(Charset) ,
• then Unpooled.wrappedBuffer(byte[]) using the Byte Array instead the String.

One byte per character for most characters, as @rossum stated.

Answer 2

Use US_ASCII charset instead of UTF-8. Haven't tested, try.