Examples of io.netty.handler.codec.http.HttpHeaders

io.netty.handler.codec.http.HttpHeaders
Provides the constants for the standard HTTP header names and values and commonly used utility methods that accesses an {@link HttpMessage}.

            chunk.content().retain();
            SpdyDataFrame spdyDataFrame = new DefaultSpdyDataFrame(currentStreamId, chunk.content());
            spdyDataFrame.setLast(chunk instanceof LastHttpContent);
            if (chunk instanceof LastHttpContent) {
                LastHttpContent trailer = (LastHttpContent) chunk;
                HttpHeaders trailers = trailer.trailingHeaders();
                if (trailers.isEmpty()) {
                    out.add(spdyDataFrame);
                } else {
                    // Create SPDY HEADERS frame out of trailers
                    SpdyHeadersFrame spdyHeadersFrame = new DefaultSpdyHeadersFrame(currentStreamId);
                    for (Map.Entry<String, String> entry: trailers) {

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            response.headers().set(ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");
        }
    }


    private static boolean isPreflightRequest(final HttpRequest request) {
        final HttpHeaders headers = request.headers();
        return request.getMethod().equals(OPTIONS) &&
                headers.contains(ORIGIN) &&
                headers.contains(ACCESS_CONTROL_REQUEST_METHOD);
    }

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        encoder.addParam("thirdinfo", "third value\r\ntest second line\r\n\r\nnew line\r\n");
        encoder.addParam("Send", "Send");


        URI uriGet = new URI(encoder.toString());
        HttpRequest request = new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, uriGet.toASCIIString());
        HttpHeaders headers = request.headers();
        headers.set(HttpHeaders.Names.HOST, host);
        headers.set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.CLOSE);
        headers.set(HttpHeaders.Names.ACCEPT_ENCODING, HttpHeaders.Values.GZIP + "," + HttpHeaders.Values.DEFLATE);


        headers.set(HttpHeaders.Names.ACCEPT_CHARSET, "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
        headers.set(HttpHeaders.Names.ACCEPT_LANGUAGE, "fr");
        headers.set(HttpHeaders.Names.REFERER, uriSimple.toString());
        headers.set(HttpHeaders.Names.USER_AGENT, "Netty Simple Http Client side");
        headers.set(HttpHeaders.Names.ACCEPT, "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");


        //connection will not close but needed
        // headers.set("Connection","keep-alive");


        headers.set(
                HttpHeaders.Names.COOKIE, ClientCookieEncoder.encode(
                        new DefaultCookie("my-cookie", "foo"),
                        new DefaultCookie("another-cookie", "bar"))
        );


        // send request
        List<Entry<String, String>> entries = headers.entries();
        channel.writeAndFlush(request);


        // Wait for the server to close the connection.
        channel.closeFuture().sync();

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            buf.append("VERSION: ").append(request.protocolVersion()).append("\r\n");
            buf.append("HOSTNAME: ").append(request.headers().get(HOST, "unknown")).append("\r\n");
            buf.append("REQUEST_URI: ").append(request.uri()).append("\r\n\r\n");


            HttpHeaders headers = request.headers();
            if (!headers.isEmpty()) {
                for (Map.Entry<String, String> h: headers) {
                    String key = h.getKey();
                    String value = h.getValue();
                    buf.append("HEADER: ").append(key).append(" = ").append(value).append("\r\n");
                }

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     * @throws Http2Exception If not all HTTP/2 headers can be translated to HTTP/1.x
     */
    private static void addHttp2ToHttpHeaders(int streamId, Http2Headers sourceHeaders,
                    FullHttpMessage destinationMessage, boolean addToTrailer, Map<String, String> translations)
                            throws Http2Exception {
        HttpHeaders headers = addToTrailer ? destinationMessage.trailingHeaders() : destinationMessage.headers();
        HttpAdapterVisitor visitor = new HttpAdapterVisitor(headers, translations);
        sourceHeaders.forEach(visitor);
        if (visitor.exception() != null) {
            throw visitor.exception();
        }


        headers.remove(HttpHeaders.Names.TRANSFER_ENCODING);
        headers.remove(HttpHeaders.Names.TRAILER);
        if (!addToTrailer) {
            headers.set(HttpUtil.ExtensionHeaders.Names.STREAM_ID, streamId);
            HttpHeaderUtil.setKeepAlive(destinationMessage, true);
        }
    }

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     */
    public HttpHeaders preflightResponseHeaders() {
        if (preflightHeaders.isEmpty()) {
            return EmptyHttpHeaders.INSTANCE;
        }
        final HttpHeaders preflightHeaders = new DefaultHttpHeaders();
        for (Entry<CharSequence, Callable<?>> entry : this.preflightHeaders.entrySet()) {
            final Object value = getValue(entry.getValue());
            if (value instanceof Iterable) {
                preflightHeaders.add(entry.getKey(), (Iterable<?>) value);
            } else {
                preflightHeaders.add(entry.getKey(), value);
            }
        }
        return preflightHeaders;
    }

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            response.headers().set(ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");
        }
    }


    private static boolean isPreflightRequest(final HttpRequest request) {
        final HttpHeaders headers = request.headers();
        return request.method().equals(OPTIONS) &&
                headers.contains(ORIGIN) &&
                headers.contains(ACCESS_CONTROL_REQUEST_METHOD);
    }

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     * This method will add the {@code headers} to the out of order headers map
     * @param streamId The stream id associated with {@code headers}
     * @param headers Newly encountered out of order headers which must be stored for future use
     */
    private void importOutOfMessageFlowHeaders(int streamId, HttpHeaders headers) {
        final HttpHeaders outOfMessageFlowHeader = outOfMessageFlowHeaders.get(streamId);
        if (outOfMessageFlowHeader == null) {
            outOfMessageFlowHeaders.put(streamId, headers);
        } else {
            outOfMessageFlowHeader.setAll(headers);
        }
    }

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     * Take any saved out of order headers and export them to {@code headers}
     * @param streamId The stream id to search for out of order headers for
     * @param headers If any out of order headers exist for {@code streamId} they will be added to this object
     */
    private void exportOutOfMessageFlowHeaders(int streamId, final HttpHeaders headers) {
        final HttpHeaders outOfMessageFlowHeader = outOfMessageFlowHeaders.get(streamId);
        if (outOfMessageFlowHeader != null) {
            headers.setAll(outOfMessageFlowHeader);
        }
    }

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        if (msg == null) {
            // msg may be null if a HTTP/2 frame event in received outside the HTTP message flow
            // For example a PRIORITY frame can be received in any state besides IDLE
            // and the HTTP message flow exists in OPEN.
            if (parent != null && !parent.equals(connection.connectionStream())) {
                HttpHeaders headers = new DefaultHttpHeaders();
                headers.set(HttpUtil.ExtensionHeaders.Names.STREAM_DEPENDENCY_ID, parent.id());
                importOutOfMessageFlowHeaders(stream.id(), headers);
            }
        } else {
            if (parent == null) {
                removePriorityRelatedHeaders(msg.headers());
                removePriorityRelatedHeaders(msg.trailingHeaders());
            } else if (!parent.equals(connection.connectionStream())) {
                HttpHeaders headers = getActiveHeaders(msg);
                headers.set(HttpUtil.ExtensionHeaders.Names.STREAM_DEPENDENCY_ID, parent.id());
            }
        }
    }

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