Reverse proxy for Instagram/tumblr etc

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http.filter (as @Whitestrake mentioned) works well for this. I have a github proxy with a config like this:

https://github.example.com {
    filter rule {
        content_type text/html.*
        search_pattern assets-cdn.github.com
        replacement assets.example.com
    }

    proxy / https://github.com {
        header_downstream -Content-Security-Policy
        header_downstream -Strict-Transport-Security
        header_downstream -Public-Key-Pins
        header_downstream -X-XSS-Protection
    }
}

https://assets.example.com {
    proxy / https://assets-cdn.github.com {
        header_downstream -Content-Security-Policy
        header_downstream -Strict-Transport-Security
        header_downstream -Public-Key-Pins
        header_downstream -X-XSS-Protection
    }
}

Login to github doesn’t work, however, as 302 redirects are not rewritten.

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