I20251202-1800
The NPE was output to System.err because nothing catches it, but its running on a thread. The code worked, but System.err would have ``` Exception in thread "Thread-2" java.lang.NullPointerException: Cannot invoke "String.indexOf(int)" because "content_type" is null at org.eclipse.swt.browser.WebKit.lambda$14(WebKit.java:2186) at java.base/java.lang.Thread.run(Thread.java:1583) ``` or similar.