1 files changed, 15 insertions, 1 deletions
diff --git a/deps/npm/node_modules/npm-profile/node_modules/make-fetch-happen/node_modules/http-cache-semantics/index.js b/deps/npm/node_modules/npm-profile/node_modules/make-fetch-happen/node_modules/http-cache-semantics/index.js
index 2e9c58c99f..8a5bcab597 100644
--- a/deps/npm/node_modules/npm-profile/node_modules/make-fetch-happen/node_modules/http-cache-semantics/index.js
+++ b/deps/npm/node_modules/npm-profile/node_modules/make-fetch-happen/node_modules/http-cache-semantics/index.js
@@ -221,7 +221,14 @@ module.exports = class CachePolicy {
 
     responseHeaders() {
         const headers = this._copyWithoutHopByHopHeaders(this._resHeaders);
-        headers.age = `${Math.round(this.age())}`;
+        const age = this.age();
+
+        // A cache SHOULD generate 113 warning if it heuristically chose a freshness
+        // lifetime greater than 24 hours and the response's age is greater than 24 hours.
+        if (age > 3600*24 && !this._hasExplicitExpiration() && this.maxAge() > 3600*24) {
+            headers.warning = (headers.warning ? `${headers.warning}, ` : '') + '113 - "rfc7234 5.5.4"';
+        }
+        headers.age = `${Math.round(age)}`;
         return headers;
     }
 
@@ -260,6 +267,13 @@ module.exports = class CachePolicy {
         return isFinite(ageValue) ? ageValue : 0;
     }
 
+    /**
+     * Value of applicable max-age (or heuristic equivalent) in seconds. This counts since response's `Date`.
+     *
+     * For an up-to-date value, see `timeToLive()`.
+     *
+     * @return Number
+     */
     maxAge() {
         if (!this.storable() || this._rescc['no-cache']) {
             return 0;