initial commit

doc/examples/njs/site/http-env-js.conf

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+server {
+    listen 8080;
+
+    location / { return 204; }
+
+    js_import ngx_env.js;
+    location = /env
+    {
+        js_content ngx_env.report;
+    }
+}

doc/examples/njs/site/ngx_env.js

@@ -0,0 +1,12 @@
+function report(r) {
+    var s = "";
+    const keys = Object.keys(process.env).sort();
+    for (const i in keys) {
+        const k = keys[i];
+        const v = process.env[k];
+        s += k + '=' + v + "\n";
+    }
+    r.return(200, s);
+}
+
+export default { report };