When an incorrectly defined Base URL is set, the "Auto Look and Feel" option results in browser errror.

Common scenario could be SSL without the proper certs, etc. Especially after a migration/upgrade.

• Browser:

  Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error.
  

• The following would appear in logs

  2013-05-30 09:42:10,432 http-bio-127.0.0.1-18000-exec-16 ERROR      [500ErrorPage.jsp] Exception caught in 500 page javax.imageio.IIOException: Can't get input stream from URL!
  java.lang.RuntimeException: javax.imageio.IIOException: Can't get input stream from URL!
  	at com.atlassian.jira.lookandfeel.AutoLookAndFeelManager.getLogoInfo(AutoLookAndFeelManager.java:245)
  	at com.atlassian.jira.lookandfeel.AutoLookAndFeelManager.generateFromLogo(AutoLookAndFeelManager.java:53)
  	at com.atlassian.jira.lookandfeel.EditLookAndFeel.doAutoUpdateColors(EditLookAndFeel.java:368)
  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  	at java.lang.reflect.Method.invoke(Unknown Source)
  	at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70)
  	at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56)
  ...
  
  Caused by: javax.imageio.IIOException: Can't get input stream from URL!
  	at javax.imageio.ImageIO.read(Unknown Source)
  	at com.atlassian.jira.lookandfeel.AutoLookAndFeelManager.getLogoInfo(AutoLookAndFeelManager.java:240)
  	... 193 more
  Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  	at sun.security.ssl.Alerts.getSSLException(Unknown Source)
  	at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
  	at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
  	at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
  	at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
  	at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
  	at sun.security.ssl.Handshaker.processLoop(Unknown Source)
  	at sun.security.ssl.Handshaker.process_record(Unknown Source)
  	at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
  	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
  	at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
  	at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
  	at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
  	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
  	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
  	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
  	at java.net.URL.openStream(Unknown Source)
  	... 195 more
  Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  	at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
  	at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
  	at sun.security.validator.Validator.validate(Unknown Source)
  	at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
  	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
  	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
  	... 208 more
  Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
  	at java.security.cert.CertPathBuilder.build(Unknown Source)
  	... 214 more
  

• In this case, JIRA needed a SSL cert installed into Java

This may also occur if the URL is simply badly defined, like http://wrongurl:8001

Quick reproduce:

• Fresh JIRA install, http://localhost:8080
• Edit Base URL to: https://localhost:8080
• Navigate to Look and Feel
• Upload a logo
• Click the "To apply a color scheme that matches your logo, click here." option
• Browser/logs error

Expectation: re-color works or some message about the base URL being ill-defined.