fix redirect caching in HttpUriPlugin

lib/schemes/HttpUriPlugin.js

@@ -509,7 +509,7 @@ class HttpUriPlugin {
 
 					/**
 					 * @param {string} url URL
-					 * @param {FetchResult} cachedResult result from cache
+					 * @param {FetchResult | RedirectFetchResult} cachedResult result from cache
 					 * @param {function((Error | null)=, FetchResult=): void} callback callback
 					 * @returns {void}
 					 */
@@ -543,15 +543,6 @@ class HttpUriPlugin {
 										logger.debug(
 											`GET ${url} [${res.statusCode}] -> ${partialResult.location}`
 										);
-										// we should follow redirect and not store partial result
-										return callback(null, {
-											...partialResult,
-											storeLock,
-											storeCache,
-											fresh: true,
-											etag: undefined,
-											validUntil: undefined
-										});
 									} else {
 										logger.debug(
 											`GET ${url} [${res.statusCode}] ${Math.ceil(
@@ -612,9 +603,30 @@ class HttpUriPlugin {
 									res.statusCode >= 301 &&
 									res.statusCode <= 308
 								) {
-									return finishWith({
+									const result = {
 										location: new URL(location, url).href
-									});
+									};
+									if (
+										!cachedResult ||
+										!("location" in cachedResult) ||
+										cachedResult.location !== result.location ||
+										cachedResult.validUntil < validUntil ||
+										cachedResult.storeLock !== storeLock ||
+										cachedResult.storeCache !== storeCache ||
+										cachedResult.etag !== etag
+									) {
+										return finishWith(result);
+									} else {
+										logger.debug(`GET ${url} [${res.statusCode}] (unchanged)`);
+										return callback(null, {
+											...result,
+											fresh: true,
+											storeLock,
+											storeCache,
+											validUntil,
+											etag
+										});
+									}
 								}
 								const contentType = res.headers["content-type"] || "";
 								const bufferArr = [];