source: josm/trunk/src/org/openstreetmap/josm/tools/HttpClient.java@ 14180

Last change on this file since 14180 was 14121, checked in by Don-vip, 6 years ago

see #15229 - deprecate all Main methods related to network features. New NetworkManager class
File size: 26.6 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.data.Version;
32import org.openstreetmap.josm.gui.progress.NullProgressMonitor;
33import org.openstreetmap.josm.gui.progress.ProgressMonitor;
34import org.openstreetmap.josm.io.Compression;
35import org.openstreetmap.josm.io.NetworkManager;
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 try {
73 CookieHandler.setDefault(new CookieManager());
74 } catch (SecurityException e) {
75 Logging.log(Logging.LEVEL_ERROR, "Unable to set default cookie handler", e);
76 }
77 }
78
79 private HttpClient(URL url, String requestMethod) {
80 this.url = url;
81 this.requestMethod = requestMethod;
82 this.headers.put("Accept-Encoding", "gzip");
83 }
84
85 /**
86 * Opens the HTTP connection.
87 * @return HTTP response
88 * @throws IOException if any I/O error occurs
89 */
90 public Response connect() throws IOException {
91 return connect(null);
92 }
93
94 /**
95 * Opens the HTTP connection.
96 * @param progressMonitor progress monitor
97 * @return HTTP response
98 * @throws IOException if any I/O error occurs
99 * @since 9179
100 */
101 public Response connect(ProgressMonitor progressMonitor) throws IOException {
102 if (progressMonitor == null) {
103 progressMonitor = NullProgressMonitor.INSTANCE;
104 }
105 final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
106 this.connection = connection;
107 connection.setRequestMethod(requestMethod);
108 connection.setRequestProperty("User-Agent", Version.getInstance().getFullAgentString());
109 connection.setConnectTimeout(connectTimeout);
110 connection.setReadTimeout(readTimeout);
111 connection.setInstanceFollowRedirects(false); // we do that ourselves
112 if (ifModifiedSince > 0) {
113 connection.setIfModifiedSince(ifModifiedSince);
114 }
115 connection.setUseCaches(useCache);
116 if (!useCache) {
117 connection.setRequestProperty("Cache-Control", "no-cache");
118 }
119 for (Map.Entry<String, String> header : headers.entrySet()) {
120 if (header.getValue() != null) {
121 connection.setRequestProperty(header.getKey(), header.getValue());
122 }
123 }
124
125 progressMonitor.beginTask(tr("Contacting Server..."), 1);
126 progressMonitor.indeterminateSubTask(null);
127
128 if ("PUT".equals(requestMethod) || "POST".equals(requestMethod) || "DELETE".equals(requestMethod)) {
129 Logging.info("{0} {1} ({2}) ...", requestMethod, url, Utils.getSizeString(requestBody.length, Locale.getDefault()));
130 if (Logging.isTraceEnabled() && requestBody.length > 0) {
131 Logging.trace("BODY: {0}", new String(requestBody, StandardCharsets.UTF_8));
132 }
133 connection.setFixedLengthStreamingMode(requestBody.length);
134 connection.setDoOutput(true);
135 try (OutputStream out = new BufferedOutputStream(
136 new ProgressOutputStream(connection.getOutputStream(), requestBody.length,
137 progressMonitor, outputMessage, finishOnCloseOutput))) {
138 out.write(requestBody);
139 }
140 }
141
142 boolean successfulConnection = false;
143 try {
144 try {
145 connection.connect();
146 final boolean hasReason = reasonForRequest != null && !reasonForRequest.isEmpty();
147 Logging.info("{0} {1}{2} -> {3}{4}",
148 requestMethod, url, hasReason ? (" (" + reasonForRequest + ')') : "",
149 connection.getResponseCode(),
150 connection.getContentLengthLong() > 0
151 ? (" (" + Utils.getSizeString(connection.getContentLengthLong(), Locale.getDefault()) + ')')
152 : ""
153 );
154 if (Logging.isDebugEnabled()) {
155 Logging.debug("RESPONSE: {0}", connection.getHeaderFields());
156 }
157 if (DefaultAuthenticator.getInstance().isEnabled() && connection.getResponseCode() == HttpURLConnection.HTTP_UNAUTHORIZED) {
158 DefaultAuthenticator.getInstance().addFailedCredentialHost(url.getHost());
159 }
160 } catch (IOException | IllegalArgumentException | NoSuchElementException e) {
161 Logging.info("{0} {1} -> !!!", requestMethod, url);
162 Logging.warn(e);
163 //noinspection ThrowableResultOfMethodCallIgnored
164 NetworkManager.addNetworkError(url, Utils.getRootCause(e));
165 throw e;
166 }
167 if (isRedirect(connection.getResponseCode())) {
168 final String redirectLocation = connection.getHeaderField("Location");
169 if (redirectLocation == null) {
170 /* I18n: argument is HTTP response code */
171 throw new IOException(tr("Unexpected response from HTTP server. Got {0} response without ''Location'' header." +
172 " Can''t redirect. Aborting.", connection.getResponseCode()));
173 } else if (maxRedirects > 0) {
174 url = new URL(url, redirectLocation);
175 maxRedirects--;
176 Logging.info(tr("Download redirected to ''{0}''", redirectLocation));
177 return connect();
178 } else if (maxRedirects == 0) {
179 String msg = tr("Too many redirects to the download URL detected. Aborting.");
180 throw new IOException(msg);
181 }
182 }
183 response = new Response(connection, progressMonitor);
184 successfulConnection = true;
185 return response;
186 } finally {
187 if (!successfulConnection) {
188 connection.disconnect();
189 }
190 }
191 }
192
193 /**
194 * Returns the HTTP response which is set only after calling {@link #connect()}.
195 * Calling this method again, returns the identical object (unless another {@link #connect()} is performed).
196 *
197 * @return the HTTP response
198 * @since 9309
199 */
200 public Response getResponse() {
201 return response;
202 }
203
204 /**
205 * A wrapper for the HTTP response.
206 */
207 public static final class Response {
208 private final HttpURLConnection connection;
209 private final ProgressMonitor monitor;
210 private final int responseCode;
211 private final String responseMessage;
212 private boolean uncompress;
213 private boolean uncompressAccordingToContentDisposition;
214 private String responseData;
215
216 private Response(HttpURLConnection connection, ProgressMonitor monitor) throws IOException {
217 CheckParameterUtil.ensureParameterNotNull(connection, "connection");
218 CheckParameterUtil.ensureParameterNotNull(monitor, "monitor");
219 this.connection = connection;
220 this.monitor = monitor;
221 this.responseCode = connection.getResponseCode();
222 this.responseMessage = connection.getResponseMessage();
223 if (this.responseCode >= 300) {
224 String contentType = getContentType();
225 if (contentType == null || (
226 contentType.contains("text") ||
227 contentType.contains("html") ||
228 contentType.contains("xml"))
229 ) {
230 String content = this.fetchContent();
231 if (content.isEmpty()) {
232 Logging.debug("Server did not return any body");
233 } else {
234 Logging.debug("Response body: ");
235 Logging.debug(this.fetchContent());
236 }
237 } else {
238 Logging.debug("Server returned content: {0} of length: {1}. Not printing.", contentType, this.getContentLength());
239 }
240 }
241 }
242
243 /**
244 * Sets whether {@link #getContent()} should uncompress the input stream if necessary.
245 *
246 * @param uncompress whether the input stream should be uncompressed if necessary
247 * @return {@code this}
248 */
249 public Response uncompress(boolean uncompress) {
250 this.uncompress = uncompress;
251 return this;
252 }
253
254 /**
255 * Sets whether {@link #getContent()} should uncompress the input stream according to {@code Content-Disposition}
256 * HTTP header.
257 * @param uncompressAccordingToContentDisposition whether the input stream should be uncompressed according to
258 * {@code Content-Disposition}
259 * @return {@code this}
260 * @since 9172
261 */
262 public Response uncompressAccordingToContentDisposition(boolean uncompressAccordingToContentDisposition) {
263 this.uncompressAccordingToContentDisposition = uncompressAccordingToContentDisposition;
264 return this;
265 }
266
267 /**
268 * Returns the URL.
269 * @return the URL
270 * @see HttpURLConnection#getURL()
271 * @since 9172
272 */
273 public URL getURL() {
274 return connection.getURL();
275 }
276
277 /**
278 * Returns the request method.
279 * @return the HTTP request method
280 * @see HttpURLConnection#getRequestMethod()
281 * @since 9172
282 */
283 public String getRequestMethod() {
284 return connection.getRequestMethod();
285 }
286
287 /**
288 * Returns an input stream that reads from this HTTP connection, or,
289 * error stream if the connection failed but the server sent useful data.
290 * <p>
291 * Note: the return value can be null, if both the input and the error stream are null.
292 * Seems to be the case if the OSM server replies a 401 Unauthorized, see #3887
293 * @return input or error stream
294 * @throws IOException if any I/O error occurs
295 *
296 * @see HttpURLConnection#getInputStream()
297 * @see HttpURLConnection#getErrorStream()
298 */
299 @SuppressWarnings("resource")
300 public InputStream getContent() throws IOException {
301 InputStream in;
302 try {
303 in = connection.getInputStream();
304 } catch (IOException ioe) {
305 Logging.debug(ioe);
306 in = Optional.ofNullable(connection.getErrorStream()).orElseGet(() -> new ByteArrayInputStream(new byte[]{}));
307 }
308 in = new ProgressInputStream(in, getContentLength(), monitor);
309 in = "gzip".equalsIgnoreCase(getContentEncoding()) ? new GZIPInputStream(in) : in;
310 Compression compression = Compression.NONE;
311 if (uncompress) {
312 final String contentType = getContentType();
313 Logging.debug("Uncompressing input stream according to Content-Type header: {0}", contentType);
314 compression = Compression.forContentType(contentType);
315 }
316 if (uncompressAccordingToContentDisposition && Compression.NONE.equals(compression)) {
317 final String contentDisposition = getHeaderField("Content-Disposition");
318 final Matcher matcher = Pattern.compile("filename=\"([^\"]+)\"").matcher(
319 contentDisposition != null ? contentDisposition : "");
320 if (matcher.find()) {
321 Logging.debug("Uncompressing input stream according to Content-Disposition header: {0}", contentDisposition);
322 compression = Compression.byExtension(matcher.group(1));
323 }
324 }
325 in = compression.getUncompressedInputStream(in);
326 return in;
327 }
328
329 /**
330 * Returns {@link #getContent()} wrapped in a buffered reader.
331 *
332 * Detects Unicode charset in use utilizing {@link UTFInputStreamReader}.
333 * @return buffered reader
334 * @throws IOException if any I/O error occurs
335 */
336 public BufferedReader getContentReader() throws IOException {
337 return new BufferedReader(
338 UTFInputStreamReader.create(getContent())
339 );
340 }
341
342 /**
343 * Fetches the HTTP response as String.
344 * @return the response
345 * @throws IOException if any I/O error occurs
346 */
347 public synchronized String fetchContent() throws IOException {
348 if (responseData == null) {
349 try (Scanner scanner = new Scanner(getContentReader()).useDelimiter("\\A")) { // \A - beginning of input
350 responseData = scanner.hasNext() ? scanner.next() : "";
351 }
352 }
353 return responseData;
354 }
355
356 /**
357 * Gets the response code from this HTTP connection.
358 * @return HTTP response code
359 *
360 * @see HttpURLConnection#getResponseCode()
361 */
362 public int getResponseCode() {
363 return responseCode;
364 }
365
366 /**
367 * Gets the response message from this HTTP connection.
368 * @return HTTP response message
369 *
370 * @see HttpURLConnection#getResponseMessage()
371 * @since 9172
372 */
373 public String getResponseMessage() {
374 return responseMessage;
375 }
376
377 /**
378 * Returns the {@code Content-Encoding} header.
379 * @return {@code Content-Encoding} HTTP header
380 * @see HttpURLConnection#getContentEncoding()
381 */
382 public String getContentEncoding() {
383 return connection.getContentEncoding();
384 }
385
386 /**
387 * Returns the {@code Content-Type} header.
388 * @return {@code Content-Type} HTTP header
389 */
390 public String getContentType() {
391 return connection.getHeaderField("Content-Type");
392 }
393
394 /**
395 * Returns the {@code Expire} header.
396 * @return {@code Expire} HTTP header
397 * @see HttpURLConnection#getExpiration()
398 * @since 9232
399 */
400 public long getExpiration() {
401 return connection.getExpiration();
402 }
403
404 /**
405 * Returns the {@code Last-Modified} header.
406 * @return {@code Last-Modified} HTTP header
407 * @see HttpURLConnection#getLastModified()
408 * @since 9232
409 */
410 public long getLastModified() {
411 return connection.getLastModified();
412 }
413
414 /**
415 * Returns the {@code Content-Length} header.
416 * @return {@code Content-Length} HTTP header
417 * @see HttpURLConnection#getContentLengthLong()
418 */
419 public long getContentLength() {
420 return connection.getContentLengthLong();
421 }
422
423 /**
424 * Returns the value of the named header field.
425 * @param name the name of a header field
426 * @return the value of the named header field, or {@code null} if there is no such field in the header
427 * @see HttpURLConnection#getHeaderField(String)
428 * @since 9172
429 */
430 public String getHeaderField(String name) {
431 return connection.getHeaderField(name);
432 }
433
434 /**
435 * Returns an unmodifiable Map mapping header keys to a List of header values.
436 * As per RFC 2616, section 4.2 header names are case insensitive, so returned map is also case insensitive
437 * @return unmodifiable Map mapping header keys to a List of header values
438 * @see HttpURLConnection#getHeaderFields()
439 * @since 9232
440 */
441 public Map<String, List<String>> getHeaderFields() {
442 // returned map from HttpUrlConnection is case sensitive, use case insensitive TreeMap to conform to RFC 2616
443 Map<String, List<String>> ret = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
444 for (Entry<String, List<String>> e: connection.getHeaderFields().entrySet()) {
445 if (e.getKey() != null) {
446 ret.put(e.getKey(), e.getValue());
447 }
448 }
449 return Collections.unmodifiableMap(ret);
450 }
451
452 /**
453 * @see HttpURLConnection#disconnect()
454 */
455 public void disconnect() {
456 HttpClient.disconnect(connection);
457 }
458 }
459
460 /**
461 * Creates a new instance for the given URL and a {@code GET} request
462 *
463 * @param url the URL
464 * @return a new instance
465 */
466 public static HttpClient create(URL url) {
467 return create(url, "GET");
468 }
469
470 /**
471 * Creates a new instance for the given URL and a {@code GET} request
472 *
473 * @param url the URL
474 * @param requestMethod the HTTP request method to perform when calling
475 * @return a new instance
476 */
477 public static HttpClient create(URL url, String requestMethod) {
478 return new HttpClient(url, requestMethod);
479 }
480
481 /**
482 * Returns the URL set for this connection.
483 * @return the URL
484 * @see #create(URL)
485 * @see #create(URL, String)
486 * @since 9172
487 */
488 public URL getURL() {
489 return url;
490 }
491
492 /**
493 * Returns the request method set for this connection.
494 * @return the HTTP request method
495 * @see #create(URL, String)
496 * @since 9172
497 */
498 public String getRequestMethod() {
499 return requestMethod;
500 }
501
502 /**
503 * Returns the set value for the given {@code header}.
504 * @param header HTTP header name
505 * @return HTTP header value
506 * @since 9172
507 */
508 public String getRequestHeader(String header) {
509 return headers.get(header);
510 }
511
512 /**
513 * Sets whether not to set header {@code Cache-Control=no-cache}
514 *
515 * @param useCache whether not to set header {@code Cache-Control=no-cache}
516 * @return {@code this}
517 * @see HttpURLConnection#setUseCaches(boolean)
518 */
519 public HttpClient useCache(boolean useCache) {
520 this.useCache = useCache;
521 return this;
522 }
523
524 /**
525 * Sets whether not to set header {@code Connection=close}
526 * <p>
527 * This might fix #7640, see
528 * <a href='https://web.archive.org/web/20140118201501/http://www.tikalk.com/java/forums/httpurlconnection-disable-keep-alive'>here</a>.
529 *
530 * @param keepAlive whether not to set header {@code Connection=close}
531 * @return {@code this}
532 */
533 public HttpClient keepAlive(boolean keepAlive) {
534 return setHeader("Connection", keepAlive ? null : "close");
535 }
536
537 /**
538 * Sets a specified timeout value, in milliseconds, to be used when opening a communications link to the resource referenced
539 * by this URLConnection. If the timeout expires before the connection can be established, a
540 * {@link java.net.SocketTimeoutException} is raised. A timeout of zero is interpreted as an infinite timeout.
541 * @param connectTimeout an {@code int} that specifies the connect timeout value in milliseconds
542 * @return {@code this}
543 * @see HttpURLConnection#setConnectTimeout(int)
544 */
545 public HttpClient setConnectTimeout(int connectTimeout) {
546 this.connectTimeout = connectTimeout;
547 return this;
548 }
549
550 /**
551 * Sets the read timeout to a specified timeout, in milliseconds. A non-zero value specifies the timeout when reading from
552 * input stream when a connection is established to a resource. If the timeout expires before there is data available for
553 * read, a {@link java.net.SocketTimeoutException} is raised. A timeout of zero is interpreted as an infinite timeout.
554 * @param readTimeout an {@code int} that specifies the read timeout value in milliseconds
555 * @return {@code this}
556 * @see HttpURLConnection#setReadTimeout(int)
557 */
558 public HttpClient setReadTimeout(int readTimeout) {
559 this.readTimeout = readTimeout;
560 return this;
561 }
562
563 /**
564 * Sets the {@code Accept} header.
565 * @param accept header value
566 *
567 * @return {@code this}
568 */
569 public HttpClient setAccept(String accept) {
570 return setHeader("Accept", accept);
571 }
572
573 /**
574 * Sets the request body for {@code PUT}/{@code POST} requests.
575 * @param requestBody request body
576 *
577 * @return {@code this}
578 */
579 public HttpClient setRequestBody(byte[] requestBody) {
580 this.requestBody = Utils.copyArray(requestBody);
581 return this;
582 }
583
584 /**
585 * Sets the {@code If-Modified-Since} header.
586 * @param ifModifiedSince header value
587 *
588 * @return {@code this}
589 */
590 public HttpClient setIfModifiedSince(long ifModifiedSince) {
591 this.ifModifiedSince = ifModifiedSince;
592 return this;
593 }
594
595 /**
596 * Sets the maximum number of redirections to follow.
597 *
598 * Set {@code maxRedirects} to {@code -1} in order to ignore redirects, i.e.,
599 * to not throw an {@link IOException} in {@link #connect()}.
600 * @param maxRedirects header value
601 *
602 * @return {@code this}
603 */
604 public HttpClient setMaxRedirects(int maxRedirects) {
605 this.maxRedirects = maxRedirects;
606 return this;
607 }
608
609 /**
610 * Sets an arbitrary HTTP header.
611 * @param key header name
612 * @param value header value
613 *
614 * @return {@code this}
615 */
616 public HttpClient setHeader(String key, String value) {
617 this.headers.put(key, value);
618 return this;
619 }
620
621 /**
622 * Sets arbitrary HTTP headers.
623 * @param headers HTTP headers
624 *
625 * @return {@code this}
626 */
627 public HttpClient setHeaders(Map<String, String> headers) {
628 this.headers.putAll(headers);
629 return this;
630 }
631
632 /**
633 * Sets a reason to show on console. Can be {@code null} if no reason is given.
634 * @param reasonForRequest Reason to show
635 * @return {@code this}
636 * @since 9172
637 */
638 public HttpClient setReasonForRequest(String reasonForRequest) {
639 this.reasonForRequest = reasonForRequest;
640 return this;
641 }
642
643 /**
644 * Sets the output message to be displayed in progress monitor for {@code PUT}, {@code POST} and {@code DELETE} methods.
645 * Defaults to "Uploading data ..." (translated). Has no effect for {@code GET} or any other method.
646 * @param outputMessage message to be displayed in progress monitor
647 * @return {@code this}
648 * @since 12711
649 */
650 public HttpClient setOutputMessage(String outputMessage) {
651 this.outputMessage = outputMessage;
652 return this;
653 }
654
655 /**
656 * Sets whether the progress monitor task will be finished when the output stream is closed. This is {@code true} by default.
657 * @param finishOnCloseOutput whether the progress monitor task will be finished when the output stream is closed
658 * @return {@code this}
659 * @since 10302
660 */
661 public HttpClient setFinishOnCloseOutput(boolean finishOnCloseOutput) {
662 this.finishOnCloseOutput = finishOnCloseOutput;
663 return this;
664 }
665
666 private static boolean isRedirect(final int statusCode) {
667 switch (statusCode) {
668 case HttpURLConnection.HTTP_MOVED_PERM: // 301
669 case HttpURLConnection.HTTP_MOVED_TEMP: // 302
670 case HttpURLConnection.HTTP_SEE_OTHER: // 303
671 case 307: // TEMPORARY_REDIRECT:
672 case 308: // PERMANENT_REDIRECT:
673 return true;
674 default:
675 return false;
676 }
677 }
678
679 /**
680 * @see HttpURLConnection#disconnect()
681 * @since 9309
682 */
683 public void disconnect() {
684 HttpClient.disconnect(connection);
685 }
686
687 private static void disconnect(final HttpURLConnection connection) {
688 if (connection != null) {
689 // Fix upload aborts - see #263
690 connection.setConnectTimeout(100);
691 connection.setReadTimeout(100);
692 try {
693 Thread.sleep(100);
694 } catch (InterruptedException ex) {
695 Logging.warn("InterruptedException in " + HttpClient.class + " during cancel");
696 Thread.currentThread().interrupt();
697 }
698 connection.disconnect();
699 }
700 }
701
702 /**
703 * Returns a {@link Matcher} against predefined Tomcat error messages.
704 * If it matches, error message can be extracted from {@code group(1)}.
705 * @param data HTML contents to check
706 * @return a {@link Matcher} against predefined Tomcat error messages
707 * @since 13358
708 */
709 public static Matcher getTomcatErrorMatcher(String data) {
710 return data != null ? TOMCAT_ERR_MESSAGE.matcher(data) : null;
711 }
712}
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