WP Super Cache is setting invalid header!
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The plugin is setting the following header:
Content-Type: text/html; charset=”UTF-8″
The problem are the quotes. There must not be quotes according to the specs! https://www.w3.org/International/articles/http-charset/index.en
This is problematic because it prevented us to use a certain REST service with the cache enabled!
The faulty code is in wp-cache-phase2.php, line 907:
$value .= “; charset=\”” . $wp_cache_blog_charset . “\””;
This prevents us to further use the plugin and might be cause for plenty of other peoples issues.
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