Add more single value headers to the singleValueResponseHeaders array in WebApplication

[zero-24]

Pull Request for Issue zero-24/plg_system_httpheader#9

Summary of Changes

Add more single value headers to the singleValueResponseHeaders array in WebApplication

New headers added to the singleValueResponseHeaders array:

• pragma
• strict-transport-security
• content-security-policy
• content-security-policy-report-only
• x-frame-options
• x-xss-protection
• x-content-type-options
• referrer-policy
• expect-ct
• feature-policy

Testing Instructions

• Install: https://github.com/zero-24/plg_system_httpheader/releases/tag/1.0.5
• enable progressive caching (System -> Global Configuration -> System -> System Cache)
• enable the system cache plugin
• visit the frontend
• refresh the page a few times

Expected result

Actual result

Documentation Changes Required

none

Side note

This is not limited to my plugin. Any other plugins setting that headers and even the core is affected by that bug (Pragma) in that specific caching case.

Mention

thanks @f-hamel for finding and reporting this issue. 🎉

[ghost]

I have tested this item ✅ successfully on 88cfd5c

Works fine.
No double headers anymore

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[Quy]

I have tested this item ✅ successfully on cbf4bf9

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/24429.}

[ghost]

@f-hamel can you please retest?

[HLeithner]

I tested it successful, thx

[zero-24]

Thanks