Nothing will unset X-Frame-Options (Apache, PHP 5.3)

Question

I\'m trying to implement an embeddable widget, functioning similar to a Twitter embedded tweet. The simplest solution, though maybe not the best, appears to be an iframe or

Answer 1

Consider the following experiment:

Header always set X-Frame-Options "DENY"
Header unset X-Frame-Options
Header set set X-Frame-Options "TEST"

response headers:

X-Frame-Options "DENY"
X-Frame-Options "TEST"

Second experiment:

Header set X-Frame-Options "DENY"
Header unset X-Frame-Options
Header set set X-Frame-Options "TEST"

response headers:

X-Frame-Options "TEST"

Conclusion: the always option blocks the original value from being unset, however it doesn't block from adding a new value.