SInce the introduction of the revamped "new Item" page the list of items that can be populated via an XMLHttpRequest.

However this is a bad thing to do as the list should not be considered static.

OSS can add to the list if a plugin is installed.
Third party extensions can contribute items (and even remove items from the list) dynamically.

This causes a big issue with IE as by default IE legitimatley caches the responses of an XMLHttpRequest unless told otherwise.

Workaround is to force a reload after cleaning the cache - but this is bad UX.

NOTE: there are probably other places in jenkins core that handle XMLHttpRequest requests that are not adding correct cache control headers - this should probably be investigated too.

Found with IE 11 on windows 10 but likely affects all versions of IE 11 and possibly (but untested Edge)

Steps to reproduce:

• Load the New Item page in your IE11 browser
• Install a new plugin which provides a new Item type
• Navigate to the new Item page again in your browser

Observed Behavior:

• You will not see the new item listed

Expected Behavior:

• The new item should show up in the list without a special action or refresh by the user