[2.3-develop] X-Magento-Tags header containing whitespaces causes exception #11849
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Description
When the header X-Magento-Tags contains whitespaces, an Zend\Http\Header\Exception\InvalidArgumentException is being thrown when the full page cache is enabled. Block IDs can contain whitespaces due to reformatting in layout XML files, because of the 80 character line length limit.
(cherry picked from commit 026da5a)
Backport of #11767 to 2.3-develop
Fixed Issues (if relevant)
Contribution checklist