first commit

wp-content/webp-express/htaccess-capability-tests/header-set/.htaccess

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+<IfModule mod_headers.c>
+    Header set X-Response-Header-Test: test
+</IfModule>

wp-content/webp-express/htaccess-capability-tests/header-set/request-me.txt

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+hi

wp-content/webp-express/htaccess-capability-tests/pass-info-from-rewrite-to-script-through-env/.htaccess

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+<IfModule mod_rewrite.c>
+
+    # Testing if we can pass environment variable from .htaccess to script in a RewriteRule
+    # We pass document root, because that can easily be checked by the script
+
+    RewriteEngine On
+    RewriteRule ^test\.php$ - [E=PASSTHROUGHENV:%{DOCUMENT_ROOT},L]
+
+</IfModule>

wp-content/webp-express/htaccess-capability-tests/pass-info-from-rewrite-to-script-through-env/test.php

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+<?php
+
+/**
+ *  Get environment variable set with mod_rewrite module
+ *  Return false if the environment variable isn't found
+ */
+function getEnvPassedInRewriteRule($envName) {
+    // Environment variables passed through the REWRITE module have "REWRITE_" as a prefix
+    // (in Apache, not Litespeed, if I recall correctly).
+    // Multiple iterations causes multiple REWRITE_ prefixes, and we get many environment variables set.
+    // We simply look for an environment variable that ends with what we are looking for.
+    // (so make sure to make it unique)
+    $len = strlen($envName);
+    foreach ($_SERVER as $key => $item) {
+        if (substr($key, -$len) == $envName) {
+            return $item;
+        }
+    }
+    return false;
+}
+
+$result = getEnvPassedInRewriteRule('PASSTHROUGHENV');
+if ($result === false) {
+    echo '0';
+    exit;
+}
+echo ($result == $_SERVER['DOCUMENT_ROOT'] ? '1' : '0');