DefaultLastHttpContent Class — netty Architecture

Source Code

codec-http/src/main/java/io/netty/handler/codec/http/DefaultLastHttpContent.java lines 30–151

public class DefaultLastHttpContent extends DefaultHttpContent implements LastHttpContent {
    private final HttpHeaders trailingHeaders;

    /**
     * Create a new empty, last HTTP content message.
     */
    public DefaultLastHttpContent() {
        this(Unpooled.buffer(0));
    }

    /**
     * Create a new last HTTP content message with the given contents.
     */
    public DefaultLastHttpContent(ByteBuf content) {
        this(content, trailersFactory());
    }

    /**
     * Create a new last HTTP content message with the given contents, and optional trailing header validation.
     * <p>
     * <b>Warning!</b> Setting {@code validateHeaders} to {@code false} will mean that Netty won't
     * validate & protect against user-supplied header values that are malicious.
     * This can leave your server implementation vulnerable to
     * <a href="https://cwe.mitre.org/data/definitions/113.html">
     *     CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')
     * </a>.
     * When disabling this validation, it is the responsibility of the caller to ensure that the values supplied
     * do not contain a non-url-escaped carriage return (CR) and/or line feed (LF) characters.
     *
     * @deprecated Prefer the {@link #DefaultLastHttpContent(ByteBuf)} constructor instead, to always have header
     * validation enabled.
     */
    @Deprecated
    public DefaultLastHttpContent(ByteBuf content, boolean validateHeaders) {
        this(content, trailersFactory().withValidation(validateHeaders));
    }

    /**
     * Create a new last HTTP content message with the given contents, and trailing headers from the given factory.
     */
    public DefaultLastHttpContent(ByteBuf content, HttpHeadersFactory trailersFactory) {
        super(content);
        trailingHeaders = trailersFactory.newHeaders();
    }

    /**
     * Create a new last HTTP content message with the given contents, and trailing headers.
     */
    public DefaultLastHttpContent(ByteBuf content, HttpHeaders trailingHeaders) {
        super(content);
        this.trailingHeaders = checkNotNull(trailingHeaders, "trailingHeaders");
    }

    @Override
    public LastHttpContent copy() {
        return replace(content().copy());
    }

    @Override
    public LastHttpContent duplicate() {
        return replace(content().duplicate());
    }

    @Override
    public LastHttpContent retainedDuplicate() {
        return replace(content().retainedDuplicate());
    }

    @Override
    public LastHttpContent replace(ByteBuf content) {
        return new DefaultLastHttpContent(content, trailingHeaders().copy());
    }

    @Override
    public LastHttpContent retain(int increment) {
        super.retain(increment);
        return this;
    }

    @Override
    public LastHttpContent retain() {