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+## BusyBox `[[ .. ]]` does not support glob matching. Use a case statement.
+
+### Problematic code:
+
+```sh
+#!/bin/busybox sh
+if [[ $1 == https:* ]]
+then
+  echo "Using URL $1"
+fi
+```
+
+### Correct code:
+
+```sh
+#!/bin/busybox sh
+case "$1" in
+  https:*)
+    echo "Using URL $1" 
+    ;;
+esac
+```
+
+### Rationale:
+
+You are using `[[ .. ]]` in BusyBox `sh` to match against a glob pattern. This is supported in Bash and Ksh, but not in BusyBox.
+
+Rewrite the match to use a `case` statement instead.
+
+### Exceptions:
+
+None.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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