How To Add CSP frame ancestors in WordPress Website? [closed]

SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X-]{4,13}$ HAVE_Accept-Encoding The regex ^(Accept-EncodXng|X-cept-Encoding|X{15}|{15}|-{15})$ is invalid, hence the error you are getting. Specifically, the error is here: ^(Accept-EncodXng|X-cept-Encoding|X{15}|{15}|-{15})$ —————————————^ {15} is a quantifier, but the preceding token | is not quantifiable, since this is itself a special meta character. There is something missing. But it’s not clear what this should be just … Read more