Avoid multiple X-Frame-Options headers #4237
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XFrameOptionsHeaderWriter should not *add*, but *set* the X-Frame-Options header. According to https://tools.ietf.org/html/rfc7034#section-2.1, having multiple values for the header is disallowed: "There are three different values for the header field. These values are mutually exclusive; that is, the header field MUST be set to exactly one of the three values." With this change, only the latest XFrameOptionsHeaderWriter will remain.
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rwinch
added
type: bug
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XFrameOptionsHeaderWriter should not add, but set the X-Frame-Options header.
According to https://tools.ietf.org/html/rfc7034#section-2.1, having multiple values for the header is disallowed:
With this change, only the latest XFrameOptionsHeaderWriter will remain.