Malformed URL Exception

[pcolmer]

Some of our sites are accessible via both http and https. In order to avoid browsers complaining about mixed content, references within pages miss off the http/https bit in order to let the browser figure that out by itself.

However, fess then doesn't cope:

2017-05-23 00:20:44,314 [Crawler-20170523000000-8-3] INFO  Crawling URL: https://www.linaro.org/downloads/
2017-05-23 00:20:44,949 [Crawler-20170523000000-8-3] WARN  Could not parse anchor tags.
java.net.MalformedURLException: no protocol: //www.linaro.org/downloads/
	at java.net.URL.<init>(URL.java:593)
	at java.net.URL.<init>(URL.java:490)
	at java.net.URL.<init>(URL.java:439)
	at org.codelibs.fess.crawler.transformer.FessXpathTransformer.getAnchorList(FessXpathTransformer.java:584)
	at org.codelibs.fess.crawler.transformer.FessXpathTransformer.putAdditionalData(FessXpathTransformer.java:320)
	at org.codelibs.fess.crawler.transformer.FessXpathTransformer.storeData(FessXpathTransformer.java:171)
	at org.codelibs.fess.crawler.transformer.impl.HtmlTransformer.transform(HtmlTransformer.java:120)
	at org.codelibs.fess.crawler.processor.impl.DefaultResponseProcessor.process(DefaultResponseProcessor.java:77)
	at org.codelibs.fess.crawler.CrawlerThread.processResponse(CrawlerThread.java:330)
	at org.codelibs.fess.crawler.CrawlerThread.run(CrawlerThread.java:176)
	at java.lang.Thread.run(Thread.java:745)