Exploring the implications of Content Security Policy in conjunction with mod_pagespeed evaluations

I am currently in the process of configuring CPS rules for my website. One issue I have encountered is that mod_pagespeeds often uses 'unsafe-eval' for scripts, which goes against my security settings. An example of code generated by mod_pagespeeds on a webpage is:

<script>eval(mod_pagespeed_N_OeYaMDDO);</script> <script>eval(mod_pagespeed_vvygFO_kog);</script>

How can I resolve this conflict?

In addition, some plugins installed on my WordPress-based website tend to include inline scripts. Is there a way to address this issue as well?

Lastly, I am debating whether or not it is wise to use 'unsafe-inline' for styles. While Google recommends inline styles for faster page loading, CPS guidelines advise against it. It's difficult to determine who to trust in this scenario.

javascripthtmlcsswordpress

Answer №1

According to the provided documentation:

As of version 1.13.35.1, PageSpeed has the ability to customize its optimizations based on any Content Security Policies specified in the response headers. To utilize this feature in the current release, users must explicitly opt-in, although future versions might enable it by default.

To opt-in for this feature, configure the following: ModPagespeedHonorCsp on

I implemented the above configuration on my server and removed unsafe-eval as a permitted CSP script source. Despite these changes, mod_pagespeed continued to use evals instead of complying with the configured CSP. This resulted in numerous errors displayed in the Chrome developer tools console. I have detailed the issue in the following link:

https://groups.google.com/forum/#!topic/mod-pagespeed-discuss/65Emhm1O1xs

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