Also happens for get BibTeX data from DOI:

Could not copy input
java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:152)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:169)
	at org.jabref.logic.importer.fetcher.DoiFetcher.performSearchById(DoiFetcher.java:55)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:47)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:22)
	at javax.swing.SwingWorker$1.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at javax.swing.SwingWorker.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at java.net.HttpURLConnection.getResponseCode(Unknown Source)
	at org.jabref.logic.net.URLDownload.openConnection(URLDownload.java:297)
	... 11 more

Info cannot be found
org.jabref.logic.importer.FetcherException: Invalid URL
	at org.jabref.logic.importer.fetcher.DoiFetcher.performSearchById(DoiFetcher.java:65)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:47)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:22)
	at javax.swing.SwingWorker$1.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at javax.swing.SwingWorker.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:152)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:169)
	at org.jabref.logic.importer.fetcher.DoiFetcher.performSearchById(DoiFetcher.java:55)
	... 8 more
Caused by: java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at java.net.HttpURLConnection.getResponseCode(Unknown Source)
	at org.jabref.logic.net.URLDownload.openConnection(URLDownload.java:297)
	... 11 more

Could not copy input
java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:152)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:169)
	at org.jabref.logic.importer.fetcher.DoiFetcher.performSearchById(DoiFetcher.java:55)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:47)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:22)
	at javax.swing.SwingWorker$1.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at javax.swing.SwingWorker.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at java.net.HttpURLConnection.getResponseCode(Unknown Source)
	at org.jabref.logic.net.URLDownload.openConnection(URLDownload.java:297)
	... 11 more

Info cannot be found
org.jabref.logic.importer.FetcherException: Invalid URL
	at org.jabref.logic.importer.fetcher.DoiFetcher.performSearchById(DoiFetcher.java:65)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:47)
	at org.jabref.gui.mergeentries.FetchAndMergeWorker.doInBackground(FetchAndMergeWorker.java:22)
	at javax.swing.SwingWorker$1.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at javax.swing.SwingWorker.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:152)
	at org.jabref.logic.net.URLDownload.asString(URLDownload.java:169)
	at org.jabref.logic.importer.fetcher.DoiFetcher.performSearchById(DoiFetcher.java:55)
	... 8 more
Caused by: java.io.IOException: Server returned HTTP response code: 503 for URL: http://data.crossref.org/10.1145%2F1496091.1496100
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at java.net.HttpURLConnection.getResponseCode(Unknown Source)
	at org.jabref.logic.net.URLDownload.openConnection(URLDownload.java:297)
	... 11 more

No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().
No localized message exception message defined. Falling back to getMessage().

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Lookup DOI (sometimes) freezes JabRef #2680

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