source: josm/trunk/src/org/openstreetmap/josm/tools/HttpClient.java@ 13608

Last change on this file since 13608 was 13358, checked in by Don-vip, 6 years ago

fix #15830 - Support (and autodetect) WMS 1.3.0
File size: 26.5 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.tools;
3
4import static org.openstreetmap.josm.tools.I18n.tr;
5
6import java.io.BufferedOutputStream;
7import java.io.BufferedReader;
8import java.io.ByteArrayInputStream;
9import java.io.IOException;
10import java.io.InputStream;
11import java.io.OutputStream;
12import java.net.CookieHandler;
13import java.net.CookieManager;
14import java.net.HttpURLConnection;
15import java.net.URL;
16import java.nio.charset.StandardCharsets;
17import java.util.Collections;
18import java.util.List;
19import java.util.Locale;
20import java.util.Map;
21import java.util.Map.Entry;
22import java.util.NoSuchElementException;
23import java.util.Optional;
24import java.util.Scanner;
25import java.util.TreeMap;
26import java.util.concurrent.TimeUnit;
27import java.util.regex.Matcher;
28import java.util.regex.Pattern;
29import java.util.zip.GZIPInputStream;
30
31import org.openstreetmap.josm.Main;
32import org.openstreetmap.josm.data.Version;
33import org.openstreetmap.josm.gui.progress.NullProgressMonitor;
34import org.openstreetmap.josm.gui.progress.ProgressMonitor;
35import org.openstreetmap.josm.io.Compression;
36import org.openstreetmap.josm.io.ProgressInputStream;
37import org.openstreetmap.josm.io.ProgressOutputStream;
38import org.openstreetmap.josm.io.UTFInputStreamReader;
39import org.openstreetmap.josm.io.auth.DefaultAuthenticator;
40import org.openstreetmap.josm.spi.preferences.Config;
41
42/**
43 * Provides a uniform access for a HTTP/HTTPS server. This class should be used in favour of {@link HttpURLConnection}.
44 * @since 9168
45 */
46public final class HttpClient {
47
48 private URL url;
49 private final String requestMethod;
50 private int connectTimeout = (int) TimeUnit.SECONDS.toMillis(Config.getPref().getInt("socket.timeout.connect", 15));
51 private int readTimeout = (int) TimeUnit.SECONDS.toMillis(Config.getPref().getInt("socket.timeout.read", 30));
52 private byte[] requestBody;
53 private long ifModifiedSince;
54 private final Map<String, String> headers = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
55 private int maxRedirects = Config.getPref().getInt("socket.maxredirects", 5);
56 private boolean useCache;
57 private String reasonForRequest;
58 private String outputMessage = tr("Uploading data ...");
59 private HttpURLConnection connection; // to allow disconnecting before `response` is set
60 private Response response;
61 private boolean finishOnCloseOutput = true;
62
63 // Pattern to detect Tomcat error message. Be careful with change of format:
64 // CHECKSTYLE.OFF: LineLength
65 // https://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/valves/ErrorReportValve.java?r1=1740707&r2=1779641&pathrev=1779641&diff_format=h
66 // CHECKSTYLE.ON: LineLength
67 private static final Pattern TOMCAT_ERR_MESSAGE = Pattern.compile(
68 ".*<p><b>[^<]+</b>[^<]+</p><p><b>[^<]+</b> (?:<u>)?([^<]*)(?:</u>)?</p><p><b>[^<]+</b> (?:<u>)?[^<]*(?:</u>)?</p>.*",
69 Pattern.CASE_INSENSITIVE);
70
71 static {
72 CookieHandler.setDefault(new CookieManager());
73 }
74
75 private HttpClient(URL url, String requestMethod) {
76 this.url = url;
77 this.requestMethod = requestMethod;
78 this.headers.put("Accept-Encoding", "gzip");
79 }
80
81 /**
82 * Opens the HTTP connection.
83 * @return HTTP response
84 * @throws IOException if any I/O error occurs
85 */
86 public Response connect() throws IOException {
87 return connect(null);
88 }
89
90 /**
91 * Opens the HTTP connection.
92 * @param progressMonitor progress monitor
93 * @return HTTP response
94 * @throws IOException if any I/O error occurs
95 * @since 9179
96 */
97 public Response connect(ProgressMonitor progressMonitor) throws IOException {
98 if (progressMonitor == null) {
99 progressMonitor = NullProgressMonitor.INSTANCE;
100 }
101 final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
102 this.connection = connection;
103 connection.setRequestMethod(requestMethod);
104 connection.setRequestProperty("User-Agent", Version.getInstance().getFullAgentString());
105 connection.setConnectTimeout(connectTimeout);
106 connection.setReadTimeout(readTimeout);
107 connection.setInstanceFollowRedirects(false); // we do that ourselves
108 if (ifModifiedSince > 0) {
109 connection.setIfModifiedSince(ifModifiedSince);
110 }
111 connection.setUseCaches(useCache);
112 if (!useCache) {
113 connection.setRequestProperty("Cache-Control", "no-cache");
114 }
115 for (Map.Entry<String, String> header : headers.entrySet()) {
116 if (header.getValue() != null) {
117 connection.setRequestProperty(header.getKey(), header.getValue());
118 }
119 }
120
121 progressMonitor.beginTask(tr("Contacting Server..."), 1);
122 progressMonitor.indeterminateSubTask(null);
123
124 if ("PUT".equals(requestMethod) || "POST".equals(requestMethod) || "DELETE".equals(requestMethod)) {
125 Logging.info("{0} {1} ({2}) ...", requestMethod, url, Utils.getSizeString(requestBody.length, Locale.getDefault()));
126 if (Logging.isTraceEnabled() && requestBody.length > 0) {
127 Logging.trace("BODY: {0}", new String(requestBody, StandardCharsets.UTF_8));
128 }
129 connection.setFixedLengthStreamingMode(requestBody.length);
130 connection.setDoOutput(true);
131 try (OutputStream out = new BufferedOutputStream(
132 new ProgressOutputStream(connection.getOutputStream(), requestBody.length,
133 progressMonitor, outputMessage, finishOnCloseOutput))) {
134 out.write(requestBody);
135 }
136 }
137
138 boolean successfulConnection = false;
139 try {
140 try {
141 connection.connect();
142 final boolean hasReason = reasonForRequest != null && !reasonForRequest.isEmpty();
143 Logging.info("{0} {1}{2} -> {3}{4}",
144 requestMethod, url, hasReason ? (" (" + reasonForRequest + ')') : "",
145 connection.getResponseCode(),
146 connection.getContentLengthLong() > 0
147 ? (" (" + Utils.getSizeString(connection.getContentLengthLong(), Locale.getDefault()) + ')')
148 : ""
149 );
150 if (Logging.isDebugEnabled()) {
151 Logging.debug("RESPONSE: {0}", connection.getHeaderFields());
152 }
153 if (DefaultAuthenticator.getInstance().isEnabled() && connection.getResponseCode() == HttpURLConnection.HTTP_UNAUTHORIZED) {
154 DefaultAuthenticator.getInstance().addFailedCredentialHost(url.getHost());
155 }
156 } catch (IOException | IllegalArgumentException | NoSuchElementException e) {
157 Logging.info("{0} {1} -> !!!", requestMethod, url);
158 Logging.warn(e);
159 //noinspection ThrowableResultOfMethodCallIgnored
160 Main.addNetworkError(url, Utils.getRootCause(e));
161 throw e;
162 }
163 if (isRedirect(connection.getResponseCode())) {
164 final String redirectLocation = connection.getHeaderField("Location");
165 if (redirectLocation == null) {
166 /* I18n: argument is HTTP response code */
167 throw new IOException(tr("Unexpected response from HTTP server. Got {0} response without ''Location'' header." +
168 " Can''t redirect. Aborting.", connection.getResponseCode()));
169 } else if (maxRedirects > 0) {
170 url = new URL(url, redirectLocation);
171 maxRedirects--;
172 Logging.info(tr("Download redirected to ''{0}''", redirectLocation));
173 return connect();
174 } else if (maxRedirects == 0) {
175 String msg = tr("Too many redirects to the download URL detected. Aborting.");
176 throw new IOException(msg);
177 }
178 }
179 response = new Response(connection, progressMonitor);
180 successfulConnection = true;
181 return response;
182 } finally {
183 if (!successfulConnection) {
184 connection.disconnect();
185 }
186 }
187 }
188
189 /**
190 * Returns the HTTP response which is set only after calling {@link #connect()}.
191 * Calling this method again, returns the identical object (unless another {@link #connect()} is performed).
192 *
193 * @return the HTTP response
194 * @since 9309
195 */
196 public Response getResponse() {
197 return response;
198 }
199
200 /**
201 * A wrapper for the HTTP response.
202 */
203 public static final class Response {
204 private final HttpURLConnection connection;
205 private final ProgressMonitor monitor;
206 private final int responseCode;
207 private final String responseMessage;
208 private boolean uncompress;
209 private boolean uncompressAccordingToContentDisposition;
210 private String responseData;
211
212 private Response(HttpURLConnection connection, ProgressMonitor monitor) throws IOException {
213 CheckParameterUtil.ensureParameterNotNull(connection, "connection");
214 CheckParameterUtil.ensureParameterNotNull(monitor, "monitor");
215 this.connection = connection;
216 this.monitor = monitor;
217 this.responseCode = connection.getResponseCode();
218 this.responseMessage = connection.getResponseMessage();
219 if (this.responseCode >= 300) {
220 String contentType = getContentType();
221 if (contentType == null || (
222 contentType.contains("text") ||
223 contentType.contains("html") ||
224 contentType.contains("xml"))
225 ) {
226 String content = this.fetchContent();
227 if (content.isEmpty()) {
228 Logging.debug("Server did not return any body");
229 } else {
230 Logging.debug("Response body: ");
231 Logging.debug(this.fetchContent());
232 }
233 } else {
234 Logging.debug("Server returned content: {0} of length: {1}. Not printing.", contentType, this.getContentLength());
235 }
236 }
237 }
238
239 /**
240 * Sets whether {@link #getContent()} should uncompress the input stream if necessary.
241 *
242 * @param uncompress whether the input stream should be uncompressed if necessary
243 * @return {@code this}
244 */
245 public Response uncompress(boolean uncompress) {
246 this.uncompress = uncompress;
247 return this;
248 }
249
250 /**
251 * Sets whether {@link #getContent()} should uncompress the input stream according to {@code Content-Disposition}
252 * HTTP header.
253 * @param uncompressAccordingToContentDisposition whether the input stream should be uncompressed according to
254 * {@code Content-Disposition}
255 * @return {@code this}
256 * @since 9172
257 */
258 public Response uncompressAccordingToContentDisposition(boolean uncompressAccordingToContentDisposition) {
259 this.uncompressAccordingToContentDisposition = uncompressAccordingToContentDisposition;
260 return this;
261 }
262
263 /**
264 * Returns the URL.
265 * @return the URL
266 * @see HttpURLConnection#getURL()
267 * @since 9172
268 */
269 public URL getURL() {
270 return connection.getURL();
271 }
272
273 /**
274 * Returns the request method.
275 * @return the HTTP request method
276 * @see HttpURLConnection#getRequestMethod()
277 * @since 9172
278 */
279 public String getRequestMethod() {
280 return connection.getRequestMethod();
281 }
282
283 /**
284 * Returns an input stream that reads from this HTTP connection, or,
285 * error stream if the connection failed but the server sent useful data.
286 * <p>
287 * Note: the return value can be null, if both the input and the error stream are null.
288 * Seems to be the case if the OSM server replies a 401 Unauthorized, see #3887
289 * @return input or error stream
290 * @throws IOException if any I/O error occurs
291 *
292 * @see HttpURLConnection#getInputStream()
293 * @see HttpURLConnection#getErrorStream()
294 */
295 @SuppressWarnings("resource")
296 public InputStream getContent() throws IOException {
297 InputStream in;
298 try {
299 in = connection.getInputStream();
300 } catch (IOException ioe) {
301 Logging.debug(ioe);
302 in = Optional.ofNullable(connection.getErrorStream()).orElseGet(() -> new ByteArrayInputStream(new byte[]{}));
303 }
304 in = new ProgressInputStream(in, getContentLength(), monitor);
305 in = "gzip".equalsIgnoreCase(getContentEncoding()) ? new GZIPInputStream(in) : in;
306 Compression compression = Compression.NONE;
307 if (uncompress) {
308 final String contentType = getContentType();
309 Logging.debug("Uncompressing input stream according to Content-Type header: {0}", contentType);
310 compression = Compression.forContentType(contentType);
311 }
312 if (uncompressAccordingToContentDisposition && Compression.NONE.equals(compression)) {
313 final String contentDisposition = getHeaderField("Content-Disposition");
314 final Matcher matcher = Pattern.compile("filename=\"([^\"]+)\"").matcher(
315 contentDisposition != null ? contentDisposition : "");
316 if (matcher.find()) {
317 Logging.debug("Uncompressing input stream according to Content-Disposition header: {0}", contentDisposition);
318 compression = Compression.byExtension(matcher.group(1));
319 }
320 }
321 in = compression.getUncompressedInputStream(in);
322 return in;
323 }
324
325 /**
326 * Returns {@link #getContent()} wrapped in a buffered reader.
327 *
328 * Detects Unicode charset in use utilizing {@link UTFInputStreamReader}.
329 * @return buffered reader
330 * @throws IOException if any I/O error occurs
331 */
332 public BufferedReader getContentReader() throws IOException {
333 return new BufferedReader(
334 UTFInputStreamReader.create(getContent())
335 );
336 }
337
338 /**
339 * Fetches the HTTP response as String.
340 * @return the response
341 * @throws IOException if any I/O error occurs
342 */
343 public synchronized String fetchContent() throws IOException {
344 if (responseData == null) {
345 try (Scanner scanner = new Scanner(getContentReader()).useDelimiter("\\A")) { // \A - beginning of input
346 responseData = scanner.hasNext() ? scanner.next() : "";
347 }
348 }
349 return responseData;
350 }
351
352 /**
353 * Gets the response code from this HTTP connection.
354 * @return HTTP response code
355 *
356 * @see HttpURLConnection#getResponseCode()
357 */
358 public int getResponseCode() {
359 return responseCode;
360 }
361
362 /**
363 * Gets the response message from this HTTP connection.
364 * @return HTTP response message
365 *
366 * @see HttpURLConnection#getResponseMessage()
367 * @since 9172
368 */
369 public String getResponseMessage() {
370 return responseMessage;
371 }
372
373 /**
374 * Returns the {@code Content-Encoding} header.
375 * @return {@code Content-Encoding} HTTP header
376 * @see HttpURLConnection#getContentEncoding()
377 */
378 public String getContentEncoding() {
379 return connection.getContentEncoding();
380 }
381
382 /**
383 * Returns the {@code Content-Type} header.
384 * @return {@code Content-Type} HTTP header
385 */
386 public String getContentType() {
387 return connection.getHeaderField("Content-Type");
388 }
389
390 /**
391 * Returns the {@code Expire} header.
392 * @return {@code Expire} HTTP header
393 * @see HttpURLConnection#getExpiration()
394 * @since 9232
395 */
396 public long getExpiration() {
397 return connection.getExpiration();
398 }
399
400 /**
401 * Returns the {@code Last-Modified} header.
402 * @return {@code Last-Modified} HTTP header
403 * @see HttpURLConnection#getLastModified()
404 * @since 9232
405 */
406 public long getLastModified() {
407 return connection.getLastModified();
408 }
409
410 /**
411 * Returns the {@code Content-Length} header.
412 * @return {@code Content-Length} HTTP header
413 * @see HttpURLConnection#getContentLengthLong()
414 */
415 public long getContentLength() {
416 return connection.getContentLengthLong();
417 }
418
419 /**
420 * Returns the value of the named header field.
421 * @param name the name of a header field
422 * @return the value of the named header field, or {@code null} if there is no such field in the header
423 * @see HttpURLConnection#getHeaderField(String)
424 * @since 9172
425 */
426 public String getHeaderField(String name) {
427 return connection.getHeaderField(name);
428 }
429
430 /**
431 * Returns an unmodifiable Map mapping header keys to a List of header values.
432 * As per RFC 2616, section 4.2 header names are case insensitive, so returned map is also case insensitive
433 * @return unmodifiable Map mapping header keys to a List of header values
434 * @see HttpURLConnection#getHeaderFields()
435 * @since 9232
436 */
437 public Map<String, List<String>> getHeaderFields() {
438 // returned map from HttpUrlConnection is case sensitive, use case insensitive TreeMap to conform to RFC 2616
439 Map<String, List<String>> ret = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
440 for (Entry<String, List<String>> e: connection.getHeaderFields().entrySet()) {
441 if (e.getKey() != null) {
442 ret.put(e.getKey(), e.getValue());
443 }
444 }
445 return Collections.unmodifiableMap(ret);
446 }
447
448 /**
449 * @see HttpURLConnection#disconnect()
450 */
451 public void disconnect() {
452 HttpClient.disconnect(connection);
453 }
454 }
455
456 /**
457 * Creates a new instance for the given URL and a {@code GET} request
458 *
459 * @param url the URL
460 * @return a new instance
461 */
462 public static HttpClient create(URL url) {
463 return create(url, "GET");
464 }
465
466 /**
467 * Creates a new instance for the given URL and a {@code GET} request
468 *
469 * @param url the URL
470 * @param requestMethod the HTTP request method to perform when calling
471 * @return a new instance
472 */
473 public static HttpClient create(URL url, String requestMethod) {
474 return new HttpClient(url, requestMethod);
475 }
476
477 /**
478 * Returns the URL set for this connection.
479 * @return the URL
480 * @see #create(URL)
481 * @see #create(URL, String)
482 * @since 9172
483 */
484 public URL getURL() {
485 return url;
486 }
487
488 /**
489 * Returns the request method set for this connection.
490 * @return the HTTP request method
491 * @see #create(URL, String)
492 * @since 9172
493 */
494 public String getRequestMethod() {
495 return requestMethod;
496 }
497
498 /**
499 * Returns the set value for the given {@code header}.
500 * @param header HTTP header name
501 * @return HTTP header value
502 * @since 9172
503 */
504 public String getRequestHeader(String header) {
505 return headers.get(header);
506 }
507
508 /**
509 * Sets whether not to set header {@code Cache-Control=no-cache}
510 *
511 * @param useCache whether not to set header {@code Cache-Control=no-cache}
512 * @return {@code this}
513 * @see HttpURLConnection#setUseCaches(boolean)
514 */
515 public HttpClient useCache(boolean useCache) {
516 this.useCache = useCache;
517 return this;
518 }
519
520 /**
521 * Sets whether not to set header {@code Connection=close}
522 * <p>
523 * This might fix #7640, see
524 * <a href='https://web.archive.org/web/20140118201501/http://www.tikalk.com/java/forums/httpurlconnection-disable-keep-alive'>here</a>.
525 *
526 * @param keepAlive whether not to set header {@code Connection=close}
527 * @return {@code this}
528 */
529 public HttpClient keepAlive(boolean keepAlive) {
530 return setHeader("Connection", keepAlive ? null : "close");
531 }
532
533 /**
534 * Sets a specified timeout value, in milliseconds, to be used when opening a communications link to the resource referenced
535 * by this URLConnection. If the timeout expires before the connection can be established, a
536 * {@link java.net.SocketTimeoutException} is raised. A timeout of zero is interpreted as an infinite timeout.
537 * @param connectTimeout an {@code int} that specifies the connect timeout value in milliseconds
538 * @return {@code this}
539 * @see HttpURLConnection#setConnectTimeout(int)
540 */
541 public HttpClient setConnectTimeout(int connectTimeout) {
542 this.connectTimeout = connectTimeout;
543 return this;
544 }
545
546 /**
547 * Sets the read timeout to a specified timeout, in milliseconds. A non-zero value specifies the timeout when reading from
548 * input stream when a connection is established to a resource. If the timeout expires before there is data available for
549 * read, a {@link java.net.SocketTimeoutException} is raised. A timeout of zero is interpreted as an infinite timeout.
550 * @param readTimeout an {@code int} that specifies the read timeout value in milliseconds
551 * @return {@code this}
552 * @see HttpURLConnection#setReadTimeout(int)
553 */
554 public HttpClient setReadTimeout(int readTimeout) {
555 this.readTimeout = readTimeout;
556 return this;
557 }
558
559 /**
560 * Sets the {@code Accept} header.
561 * @param accept header value
562 *
563 * @return {@code this}
564 */
565 public HttpClient setAccept(String accept) {
566 return setHeader("Accept", accept);
567 }
568
569 /**
570 * Sets the request body for {@code PUT}/{@code POST} requests.
571 * @param requestBody request body
572 *
573 * @return {@code this}
574 */
575 public HttpClient setRequestBody(byte[] requestBody) {
576 this.requestBody = Utils.copyArray(requestBody);
577 return this;
578 }
579
580 /**
581 * Sets the {@code If-Modified-Since} header.
582 * @param ifModifiedSince header value
583 *
584 * @return {@code this}
585 */
586 public HttpClient setIfModifiedSince(long ifModifiedSince) {
587 this.ifModifiedSince = ifModifiedSince;
588 return this;
589 }
590
591 /**
592 * Sets the maximum number of redirections to follow.
593 *
594 * Set {@code maxRedirects} to {@code -1} in order to ignore redirects, i.e.,
595 * to not throw an {@link IOException} in {@link #connect()}.
596 * @param maxRedirects header value
597 *
598 * @return {@code this}
599 */
600 public HttpClient setMaxRedirects(int maxRedirects) {
601 this.maxRedirects = maxRedirects;
602 return this;
603 }
604
605 /**
606 * Sets an arbitrary HTTP header.
607 * @param key header name
608 * @param value header value
609 *
610 * @return {@code this}
611 */
612 public HttpClient setHeader(String key, String value) {
613 this.headers.put(key, value);
614 return this;
615 }
616
617 /**
618 * Sets arbitrary HTTP headers.
619 * @param headers HTTP headers
620 *
621 * @return {@code this}
622 */
623 public HttpClient setHeaders(Map<String, String> headers) {
624 this.headers.putAll(headers);
625 return this;
626 }
627
628 /**
629 * Sets a reason to show on console. Can be {@code null} if no reason is given.
630 * @param reasonForRequest Reason to show
631 * @return {@code this}
632 * @since 9172
633 */
634 public HttpClient setReasonForRequest(String reasonForRequest) {
635 this.reasonForRequest = reasonForRequest;
636 return this;
637 }
638
639 /**
640 * Sets the output message to be displayed in progress monitor for {@code PUT}, {@code POST} and {@code DELETE} methods.
641 * Defaults to "Uploading data ..." (translated). Has no effect for {@code GET} or any other method.
642 * @param outputMessage message to be displayed in progress monitor
643 * @return {@code this}
644 * @since 12711
645 */
646 public HttpClient setOutputMessage(String outputMessage) {
647 this.outputMessage = outputMessage;
648 return this;
649 }
650
651 /**
652 * Sets whether the progress monitor task will be finished when the output stream is closed. This is {@code true} by default.
653 * @param finishOnCloseOutput whether the progress monitor task will be finished when the output stream is closed
654 * @return {@code this}
655 * @since 10302
656 */
657 public HttpClient setFinishOnCloseOutput(boolean finishOnCloseOutput) {
658 this.finishOnCloseOutput = finishOnCloseOutput;
659 return this;
660 }
661
662 private static boolean isRedirect(final int statusCode) {
663 switch (statusCode) {
664 case HttpURLConnection.HTTP_MOVED_PERM: // 301
665 case HttpURLConnection.HTTP_MOVED_TEMP: // 302
666 case HttpURLConnection.HTTP_SEE_OTHER: // 303
667 case 307: // TEMPORARY_REDIRECT:
668 case 308: // PERMANENT_REDIRECT:
669 return true;
670 default:
671 return false;
672 }
673 }
674
675 /**
676 * @see HttpURLConnection#disconnect()
677 * @since 9309
678 */
679 public void disconnect() {
680 HttpClient.disconnect(connection);
681 }
682
683 private static void disconnect(final HttpURLConnection connection) {
684 if (connection != null) {
685 // Fix upload aborts - see #263
686 connection.setConnectTimeout(100);
687 connection.setReadTimeout(100);
688 try {
689 Thread.sleep(100);
690 } catch (InterruptedException ex) {
691 Logging.warn("InterruptedException in " + HttpClient.class + " during cancel");
692 Thread.currentThread().interrupt();
693 }
694 connection.disconnect();
695 }
696 }
697
698 /**
699 * Returns a {@link Matcher} against predefined Tomcat error messages.
700 * If it matches, error message can be extracted from {@code group(1)}.
701 * @param data HTML contents to check
702 * @return a {@link Matcher} against predefined Tomcat error messages
703 * @since 13358
704 */
705 public static Matcher getTomcatErrorMatcher(String data) {
706 return data != null ? TOMCAT_ERR_MESSAGE.matcher(data) : null;
707 }
708}
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