fix #6480
fix #6480

update OriginTest to test getFieldValue fix
Revert "fix #6480"

This reverts commit 2f0160915ae480aad13cb0ce29b1e819dbeb29a8.
fix #6480
#6484 - `Zend\Http\Header\Origin` value should always be a string
#6484 - `Zend\Http\Header\Origin` is always be a string
#6484 - removed old `@todo`
#6484 - adding constructor docblock
#6484 - removing incomplete, redundant test
Merge branch 'hotfix/#6484-zend-http-origin-header-instantiation'

Close #6484