Java Code Examples for io.undertow.util.HttpString

/**
 * Test of matchOrigin method, of class CorsUtil.
 */
@Test
public void testMatchOrigin() throws Exception {
    HeaderMap headerMap = new HeaderMap();
    headerMap.add(HOST, "localhost:80");
    headerMap.add(ORIGIN, "http://localhost");
    HttpServerExchange exchange = new HttpServerExchange(null, headerMap, new HeaderMap(), 10);
    exchange.setRequestScheme("http");
    exchange.setRequestMethod(HttpString.EMPTY);
    Collection<String> allowedOrigins = null;
    assertThat(CorsUtil.matchOrigin(exchange, allowedOrigins), is("http://localhost"));
    allowedOrigins = Collections.singletonList("http://www.example.com:9990");
    //Default origin
    assertThat(CorsUtil.matchOrigin(exchange, allowedOrigins), is("http://localhost"));
    headerMap.clear();
    headerMap.add(HOST, "localhost:80");
    headerMap.add(ORIGIN, "http://www.example.com:9990");
    assertThat(CorsUtil.matchOrigin(exchange, allowedOrigins), is("http://www.example.com:9990"));
    headerMap.clear();
    headerMap.add(HOST, "localhost:80");
    headerMap.add(ORIGIN, "http://www.example.com");
    assertThat(CorsUtil.matchOrigin(exchange, allowedOrigins), is(nullValue()));
    headerMap.addAll(ORIGIN, Arrays.asList("http://localhost:8080", "http://www.example.com:9990", "http://localhost"));
    allowedOrigins = Arrays.asList("http://localhost", "http://www.example.com:9990");
    assertThat(CorsUtil.matchOrigin(exchange, allowedOrigins), is("http://localhost"));
}
 

@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
    IMap<String, List<ServiceEndpoint>> serviceEndpoints = CacheStartupHookProvider.hz.getMap("serviceEndpoints");

    String serviceId = exchange.getQueryParameters().get("serviceId").getFirst();
    List<ServiceEndpoint> values = serviceEndpoints.get(serviceId);

    if(values == null || values.size() == 0) {
        setExchangeStatus(exchange, SERVICE_ENDPOINT_NOT_FOUND, serviceId);
        processAudit(exchange);
        return;
    }
    exchange.getResponseHeaders().add(new HttpString("Content-Type"), "application/json");
    exchange.getResponseSender().send(Config.getInstance().getMapper().writeValueAsString(values));
    processAudit(exchange);
}
 

private void prepareResponseChannel(ClientResponse response, ClientExchange exchange) {
    String encoding = response.getResponseHeaders().getLast(Headers.TRANSFER_ENCODING);
    boolean chunked = encoding != null && Headers.CHUNKED.equals(new HttpString(encoding));
    String length = response.getResponseHeaders().getFirst(Headers.CONTENT_LENGTH);
    if (exchange.getRequest().getMethod().equals(Methods.HEAD)) {
        connection.getSourceChannel().setConduit(new FixedLengthStreamSourceConduit(connection.getSourceChannel().getConduit(), 0, responseFinishedListener));
    } else if (chunked) {
        connection.getSourceChannel().setConduit(new ChunkedStreamSourceConduit(connection.getSourceChannel().getConduit(), pushBackStreamSourceConduit, bufferPool, responseFinishedListener, exchange, connection));
    } else if (length != null) {
        try {
            long contentLength = Long.parseLong(length);
            connection.getSourceChannel().setConduit(new FixedLengthStreamSourceConduit(connection.getSourceChannel().getConduit(), contentLength, responseFinishedListener));
        } catch (NumberFormatException e) {
            handleError(e);
            throw e;
        }
    } else if (response.getProtocol().equals(Protocols.HTTP_1_1) && !Connectors.isEntityBodyAllowed(response.getResponseCode())) {
        connection.getSourceChannel().setConduit(new FixedLengthStreamSourceConduit(connection.getSourceChannel().getConduit(), 0, responseFinishedListener));
    } else {
        connection.getSourceChannel().setConduit(new FinishableStreamSourceConduit(connection.getSourceChannel().getConduit(), responseFinishedListener));
        state |= CLOSE_REQ;
    }
}
 

@Test
void append() {
    var headers = new HeaderMap();
    HttpString name = new HttpString("client-id");

    headers.put(name, "client1");
    var builder = new StringBuilder();
    var param = new HeaderLogParam(name, headers.get(name));
    param.append(builder, Set.of(), 1000);
    assertThat(builder.toString()).isEqualTo("client1");

    headers.add(name, "client2");
    builder = new StringBuilder();
    param = new HeaderLogParam(name, headers.get(name));
    param.append(builder, Set.of(), 1000);
    assertThat(builder.toString()).isEqualTo("[client1, client2]");
}
 

/**
 * Return if a given HTTP method results in a read or write request to a resource
 * 
 * GET = read
 * POST = write
 * PUT = write
 * DELETE = write
 * PATCH = write
 * OPTIONS = read
 * HEAD = read
 * 
 * @param method The HTTP method
 * @return read or write if HTTP method is found, blank otherwise
 */
public static String getOperation(HttpString method) {
    String operation = "";
    
    if (Methods.POST.equals(method)) {
        operation = WRITE;
    } else if (Methods.PUT.equals(method)) {
        operation = WRITE;
    } else if (Methods.DELETE.equals(method)) {
        operation = WRITE;
    } else if (Methods.GET.equals(method)) {
        operation = READ;
    } else if (Methods.PATCH.equals(method)) {
        operation = WRITE;
    } else if (Methods.OPTIONS.equals(method)) {
        operation = READ;
    } else if (Methods.HEAD.equals(method)) {
        operation = READ;
    } else {
        // ignore everything else
    }
    
    return operation;
}
 

@Override
public void sendRequest(final ClientRequest request, final ClientCallback<ClientExchange> clientCallback) {
    if(http2Delegate != null) {
        http2Delegate.sendRequest(request, clientCallback);
        return;
    }
    if (anyAreSet(state, UPGRADE_REQUESTED | UPGRADED | CLOSE_REQ | CLOSED)) {
        clientCallback.failed(UndertowClientMessages.MESSAGES.invalidConnectionState());
        return;
    }
    final HttpClientExchange httpClientExchange = new HttpClientExchange(clientCallback, request, this);
    boolean ssl = this.connection instanceof SslConnection;
    if(!ssl && !http2Tried && options.get(UndertowOptions.ENABLE_HTTP2, false) && !request.getRequestHeaders().contains(Headers.UPGRADE)) {
        //this is the first request, as we want to try a HTTP2 upgrade
        request.getRequestHeaders().put(new HttpString("HTTP2-Settings"), Http2ClearClientProvider.createSettingsFrame(options, bufferPool));
        request.getRequestHeaders().put(Headers.UPGRADE, Http2Channel.CLEARTEXT_UPGRADE_STRING);
        request.getRequestHeaders().put(Headers.CONNECTION, "Upgrade, HTTP2-Settings");
        http2Tried = true;
    }

    if (currentRequest == null) {
        initiateRequest(httpClientExchange);
    } else {
        pendingQueue.add(httpClientExchange);
    }
}
 

/**
 * Add a PathChain (having a non-null path) to the handler data structures.
 */
private static void addPathChain(PathChain pathChain) {
	HttpString method = new HttpString(pathChain.getMethod());

	// Use a random integer as the id for a given path.
	Integer randInt = new Random().nextInt();
	while (handlerListById.containsKey(randInt.toString())) {
		randInt = new Random().nextInt();
	}

	// Flatten out the execution list from a mix of middleware chains and handlers.
	List<HttpHandler> handlers = getHandlersFromExecList(pathChain.getExec());
	if(handlers.size() > 0) {
		// If a matcher already exists for the given type, at to that instead of
		// creating a new one.
		PathTemplateMatcher<String> pathTemplateMatcher = methodToMatcherMap.containsKey(method)
			? methodToMatcherMap.get(method)
			: new PathTemplateMatcher<>();

		if(pathTemplateMatcher.get(pathChain.getPath()) == null) { pathTemplateMatcher.add(pathChain.getPath(), randInt.toString()); }
		methodToMatcherMap.put(method, pathTemplateMatcher);
		handlerListById.put(randInt.toString(), handlers);
	}
}
 

public boolean execute(Object ...objects) throws Exception {
    Map<String, Object> inputMap = (Map<String, Object>) objects[0];
    Map<String, Object> data = (Map<String, Object>) inputMap.get("data");
    String token = (String) data.get("token");
    String path = null;
    Map<String, Object> fileMap = ServiceLocator.getInstance().getMemoryImage("fileMap");
    ConcurrentMap<Object, Object> cache = (ConcurrentMap<Object, Object>)fileMap.get("cache");
    if(cache != null) {
        path = (String)cache.get(token);
    }
    if(path == null) {
        inputMap.put("result", "Token is expired.");
        inputMap.put("responseCode", 400);
        return false;
    } else {
        HttpServerExchange exchange = (HttpServerExchange)inputMap.get("exchange");
        File file = new File(path);
        String name = file.getName();
        exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "application/x-download");
        exchange.getResponseHeaders().put(new HttpString("Content-disposition"), "attachment; filename=" + name);
        writeToOutputStream(file, exchange.getOutputStream());
        return true;
    }
}
 

@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
    IMap<String, RefreshToken> tokens = CacheStartupHookProvider.hz.getMap("tokens");
    Deque<String> userIdDeque = exchange.getQueryParameters().get("userId");
    String userId = userIdDeque == null? "%" : userIdDeque.getFirst() + "%";
    int page = Integer.valueOf(exchange.getQueryParameters().get("page").getFirst()) - 1;
    Deque<String> pageSizeDeque = exchange.getQueryParameters().get("pageSize");
    int pageSize = pageSizeDeque == null? 10 : Integer.valueOf(pageSizeDeque.getFirst());
    if(logger.isDebugEnabled()) logger.debug("userId = " + userId + " page = " + page + " pageSize = " + pageSize);
    LikePredicate likePredicate = new LikePredicate("userId", userId);

    PagingPredicate pagingPredicate = new PagingPredicate(likePredicate, new RefreshTokenComparator(), pageSize);
    pagingPredicate.setPage(page);
    Collection<RefreshToken> values = tokens.values(pagingPredicate);

    exchange.getResponseHeaders().add(new HttpString("Content-Type"), "application/json");
    exchange.getResponseSender().send(Config.getInstance().getMapper().writeValueAsString(values));
    processAudit(exchange);
}
 

protected ExchangeAttribute getServerToClientElement(
        PatternTokenizer tokenizer) throws IOException {
    if (tokenizer.hasSubToken()) {
        String token = tokenizer.getToken();
        if ("status".equals(token)) {
            return ResponseCodeAttribute.INSTANCE;
        } else if ("comment".equals(token)) {
            return new ConstantExchangeAttribute("?");
        }
    } else if (tokenizer.hasParameter()) {
        String parameter = tokenizer.getParameter();
        if (parameter == null) {
            UndertowLogger.ROOT_LOGGER.extendedAccessLogMissingClosing();
            return null;
        }
        return new QuotingExchangeAttribute(new ResponseHeaderAttribute(new HttpString(parameter)));
    }
    UndertowLogger.ROOT_LOGGER.extendedAccessLogCannotDecode(tokenizer.getRemains());
    return null;
}
 

@Test
public void testWithSerializedContextData() throws Throwable {
    TracingHandler handler = new TracingHandler(httpHandler);
    HttpServerExchange exchange = buildExchange();
    exchange.getRequestHeaders()
            .put(HttpString.tryFromString(SW8CarrierItem.HEADER_NAME), "1-My40LjU=-MS4yLjM=-3-c2VydmljZQ==-aW5zdGFuY2U=-L2FwcA==-MTI3LjAuMC4xOjgwODA=");
    handler.handleRequest(exchange);
    exchange.endExchange();

    assertThat(segmentStorage.getTraceSegments().size(), is(1));
    TraceSegment traceSegment = segmentStorage.getTraceSegments().get(0);
    List<AbstractTracingSpan> spans = SegmentHelper.getSpans(traceSegment);

    assertHttpSpan(spans.get(0));
    assertTraceSegmentRef(traceSegment.getRefs().get(0));
}
 

@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
    String responseBody = null;
    if(exchange.getAttachment(BodyHandler.REQUEST_BODY) != null) {
        responseBody = Config.getInstance().getMapper().writeValueAsString(exchange.getAttachment(BodyHandler.REQUEST_BODY));
    }

    List<HttpString> headerNames = exchange.getRequestHeaders().getHeaderNames().stream()
            .filter( s -> s.toString().startsWith("todo"))
            .collect(Collectors.toList());
    for(HttpString headerName : headerNames) {
        String headerValue = exchange.getRequestHeaders().get(headerName).getFirst();
        exchange.getResponseHeaders().put(headerName, headerValue);
    }
    exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, ContentType.APPLICATION_JSON.value());
    exchange.getResponseSender().send(responseBody);
}
 

@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
    IMap<String, Client> clients = CacheStartupHookProvider.hz.getMap("clients");
    Deque<String> clientNameDeque = exchange.getQueryParameters().get("clientName");
    String clientName = clientNameDeque == null? "%" : clientNameDeque.getFirst() + "%";
    int page = Integer.valueOf(exchange.getQueryParameters().get("page").getFirst()) - 1;
    Deque<String> pageSizeDeque = exchange.getQueryParameters().get("pageSize");
    int pageSize = pageSizeDeque == null? 10 : Integer.valueOf(pageSizeDeque.getFirst());

    LikePredicate likePredicate = new LikePredicate("clientName", clientName);

    PagingPredicate pagingPredicate = new PagingPredicate(likePredicate, new ClientComparator(), pageSize);
    pagingPredicate.setPage(page);
    Collection<Client> values = clients.values(pagingPredicate);

    List results = new ArrayList();
    for (Client value : values) {
        Client c = Client.copyClient(value);
        c.setClientSecret(null);
        results.add(c);
    }
    exchange.getResponseHeaders().add(new HttpString("Content-Type"), "application/json");
    exchange.getResponseSender().send(Config.getInstance().getMapper().writeValueAsString(results));
    processAudit(exchange);
}
 

@SuppressWarnings("unchecked")
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
    String clientId = exchange.getQueryParameters().get("clientId").getFirst();

    IMap<String, Client> clients = CacheStartupHookProvider.hz.getMap("clients");
    Client client = clients.get(clientId);

    if(client == null) {
        setExchangeStatus(exchange, CLIENT_NOT_FOUND, clientId);
        processAudit(exchange);
        return;
    }
    Client c = Client.copyClient(client);
    c.setClientSecret(null);
    exchange.getResponseHeaders().add(new HttpString("Content-Type"), "application/json");
    exchange.getResponseSender().send(Config.getInstance().getMapper().writeValueAsString(c));
    processAudit(exchange);
}
 

private void setResponseHeaders(Headers headers, HttpServerExchange exchange) {
    HeaderMap map = exchange.getResponseHeaders();
    headers.keySet().forEach(headerName -> headers.getList(headerName)
            .forEach(v -> {
                if (v instanceof String) {
                    map.add(HttpString.tryFromString(headerName), (String) v);
                } else if (v instanceof Number) {
                    map.add(HttpString.tryFromString(headerName), ((Number) v).longValue());
                }
            }));
}
 

static RoutingHandler getTestHandler() {
    return Handlers.routing()
            .add(Methods.GET, "/v2/pet/{petId}", exchange -> {
                Map<String, Object> examples = new HashMap<>();
                examples.put("application/xml", StringEscapeUtils.unescapeHtml4("&lt;Pet&gt;  &lt;id&gt;123456&lt;/id&gt;  &lt;name&gt;doggie&lt;/name&gt;  &lt;photoUrls&gt;    &lt;photoUrls&gt;string&lt;/photoUrls&gt;  &lt;/photoUrls&gt;  &lt;tags&gt;  &lt;/tags&gt;  &lt;status&gt;string&lt;/status&gt;&lt;/Pet&gt;"));
                examples.put("application/json", StringEscapeUtils.unescapeHtml4("{  &quot;photoUrls&quot; : [ &quot;aeiou&quot; ],  &quot;name&quot; : &quot;doggie&quot;,  &quot;id&quot; : 123456789,  &quot;category&quot; : {    &quot;name&quot; : &quot;aeiou&quot;,    &quot;id&quot; : 123456789  },  &quot;tags&quot; : [ {    &quot;name&quot; : &quot;aeiou&quot;,    &quot;id&quot; : 123456789  } ],  &quot;status&quot; : &quot;aeiou&quot;}"));
                if(examples.size() > 0) {
                    exchange.getResponseHeaders().add(new HttpString("Content-Type"), "application/json");
                    exchange.getResponseSender().send((String)examples.get("application/json"));
                } else {
                    exchange.endExchange();
                }
            })
            .add(Methods.GET, "/v2/pet", exchange -> exchange.getResponseSender().send("get"));
}
 

private static boolean persistentConnection(HttpServerExchange exchange, String connectionHeader) {
    if (exchange.isHttp11()) {
        return !(connectionHeader != null && Headers.CLOSE.equalToString(connectionHeader));
    } else if (exchange.isHttp10()) {
        if (connectionHeader != null) {
            if (Headers.KEEP_ALIVE.equals(new HttpString(connectionHeader))) {
                return true;
            }
        }
    }
    log.trace("Connection not persistent");
    return false;
}
 

private void writeHuffmanEncodableValue(ByteBuffer target, HttpString headerName, String val) {
    if (hpackHeaderFunction.shouldUseHuffman(headerName, val)) {
        if (!HPackHuffman.encode(target, val, false)) {
            writeValueString(target, val);
        }
    } else {
        writeValueString(target, val);
    }
}
 

static RoutingHandler getTestHandler() {
    return Handlers.routing()
            .add(Methods.GET, "/v1/pets/{petId}", exchange -> {
                Map<String, Object> examples = new HashMap<>();
                examples.put("application/xml", StringEscapeUtils.unescapeHtml4("&lt;Pet&gt;  &lt;id&gt;123456&lt;/id&gt;  &lt;name&gt;doggie&lt;/name&gt;  &lt;photoUrls&gt;    &lt;photoUrls&gt;string&lt;/photoUrls&gt;  &lt;/photoUrls&gt;  &lt;tags&gt;  &lt;/tags&gt;  &lt;status&gt;string&lt;/status&gt;&lt;/Pet&gt;"));
                examples.put("application/json", StringEscapeUtils.unescapeHtml4("{  &quot;photoUrls&quot; : [ &quot;aeiou&quot; ],  &quot;name&quot; : &quot;doggie&quot;,  &quot;id&quot; : 123456789,  &quot;category&quot; : {    &quot;name&quot; : &quot;aeiou&quot;,    &quot;id&quot; : 123456789  },  &quot;tags&quot; : [ {    &quot;name&quot; : &quot;aeiou&quot;,    &quot;id&quot; : 123456789  } ],  &quot;status&quot; : &quot;aeiou&quot;}"));
                if(examples.size() > 0) {
                    exchange.getResponseHeaders().add(new HttpString("Content-Type"), "application/json");
                    exchange.getResponseSender().send((String)examples.get("application/json"));
                } else {
                    exchange.endExchange();
                }
            })
            .add(Methods.GET, "/v1/pets", exchange -> exchange.getResponseSender().send("get"));
}
 

@Override
@SuppressWarnings("unchecked")
public void handleRequest(HttpServerExchange exchange) throws Exception {
    try {
        ContainerRequest request = createContainerRequest(exchange);
        request.setWriter(new UndertowResponseWriter(exchange, container));
        container.getApplicationHandler().handle(request);
    } catch (Throwable e) {
        if (exchange.isResponseChannelAvailable()) {
            exchange.setStatusCode(500);
            exchange.getResponseHeaders().add(new HttpString("Content-Type"), "text/plain");
            exchange.getResponseSender().send(Exceptions.stackTrace(e));
        }
    }
}
 

TableEntry(HttpString name, String value, int position) {
    this.name = name;
    this.value = value;
    this.position = position;
    if (value != null) {
        this.size = 32 + name.length() + value.length();
    } else {
        this.size = -1;
    }
}
 

@Test
public void testNoResponseContentValidation() throws ClientException, URISyntaxException, ExecutionException, InterruptedException, TimeoutException {
    ClientRequest clientRequest = new ClientRequest();
    clientRequest.getRequestHeaders().put(new HttpString("todo_Header1"), "header_1");
    CompletableFuture<ClientResponse> future = sendResponse(clientRequest, "");
    String statusCode = future.get().getStatus();
    Assert.assertNotEquals("OK", statusCode);
}
 

private void writeHuffmanEncodableName(ByteBuffer target, HttpString headerName) {
    if (hpackHeaderFunction.shouldUseHuffman(headerName)) {
        if(HPackHuffman.encode(target, headerName.toString(), true)) {
            return;
        }
    }
    target.put((byte) 0); //to use encodeInteger we need to place the first byte in the buffer.
    encodeInteger(target, headerName.length(), 7);
    for (int j = 0; j < headerName.length(); ++j) {
        target.put(Hpack.toLower(headerName.byteAt(j)));
    }

}
 

public synchronized RoutingHandler add(HttpString method, String template, HttpHandler handler) {
    PathTemplateMatcher<RoutingMatch> matcher = matches.get(method);
    if (matcher == null) {
        matches.put(method, matcher = new PathTemplateMatcher<>());
    }
    RoutingMatch res = matcher.get(template);
    if (res == null) {
        matcher.add(template, res = new RoutingMatch());
    }
    if (allMethodsMatcher.get(template) == null) {
        allMethodsMatcher.add(template, res);
    }
    res.defaultHandler = handler;
    return this;
}
 

@Test
public void testResponseContentValidationWithNoError() throws ClientException, URISyntaxException, ExecutionException, InterruptedException {
    ClientRequest clientRequest = new ClientRequest();
    clientRequest.getRequestHeaders().put(new HttpString("todo_Header1"), "header_1");
    CompletableFuture<ClientResponse> future = sendResponse(clientRequest, "response1");
    String statusCode = future.get().getStatus();
    Assert.assertEquals("OK", statusCode);
    List<String> errorLines = getErrorLinesFromLogFile();
    Assert.assertTrue(errorLines.size() == 0);
}
 

@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
    SpecificationConfig config = (SpecificationConfig)Config.getInstance().getJsonObjectConfig(CONFIG_NAME, SpecificationConfig.class);
    final String payload = Config.getInstance().getStringFromFile(config.getFileName());
    exchange.getResponseHeaders().add(new HttpString("Content-Type"), config.getContentType());
    exchange.getResponseSender().send(payload);
}
 

@Override
public ExchangeAttribute build(final String token) {
    if (token.startsWith("%{o,") && token.endsWith("}")) {
        final HttpString headerName = HttpString.tryFromString(token.substring(4, token.length() - 1));
        return new ResponseHeaderAttribute(headerName);
    }
    return null;
}
 

/**
 * Handle a management+ request.
 *
 * @param method   the http method
 * @param exchange the http server exchange
 * @throws Exception
 */
protected void handleRequest(final HttpString method, HttpServerExchange exchange) throws Exception {
    final RequestData requestData = parseFormData(exchange);
    boolean persistent = exchange.isPersistent();
    exchange.setPersistent(false); //UNDERTOW-947 MCMP should not use persistent connections
    if (CONFIG.equals(method)) {
        processConfig(exchange, requestData);
    } else if (ENABLE_APP.equals(method)) {
        processCommand(exchange, requestData, MCMPAction.ENABLE);
    } else if (DISABLE_APP.equals(method)) {
        processCommand(exchange, requestData, MCMPAction.DISABLE);
    } else if (STOP_APP.equals(method)) {
        processCommand(exchange, requestData, MCMPAction.STOP);
    } else if (REMOVE_APP.equals(method)) {
        processCommand(exchange, requestData, MCMPAction.REMOVE);
    } else if (STATUS.equals(method)) {
        processStatus(exchange, requestData);
    } else if (INFO.equals(method)) {
        processInfo(exchange);
    } else if (DUMP.equals(method)) {
        processDump(exchange);
    } else if (PING.equals(method)) {
        processPing(exchange, requestData);
    } else {
        exchange.setPersistent(persistent);
        next.handleRequest(exchange);
    }
}
 

@Override
public Enumeration<String> getHeaderNames() {
    final Set<String> headers = new HashSet<>();
    for (final HttpString i : exchange.getRequestHeaders().getHeaderNames()) {
        headers.add(i.toString());
    }
    return new IteratorEnumeration<>(headers.iterator());
}
 

/**
 * Send an error message.
 *
 * @param type         the error type
 * @param errString    the error string
 * @param exchange     the http server exchange
 */
static void processError(String type, String errString, HttpServerExchange exchange) {
    exchange.setStatusCode(StatusCodes.INTERNAL_SERVER_ERROR);
    exchange.getResponseHeaders().add(Headers.CONTENT_TYPE, CONTENT_TYPE);
    exchange.getResponseHeaders().add(new HttpString("Version"), VERSION_PROTOCOL);
    exchange.getResponseHeaders().add(new HttpString("Type"), type);
    exchange.getResponseHeaders().add(new HttpString("Mess"), errString);
    exchange.endExchange();
    UndertowLogger.ROOT_LOGGER.mcmpProcessingError(type, errString);
}