feat: 支持使用脚本删除响应头字段

Author: xream

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.21.2",
+  "version": "2.21.3",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and Shadowrocket.",
   "main": "src/main.js",
   "scripts": {

backend/src/restful/download.js

@@ -364,7 +364,11 @@ async function downloadSubscription(req, res) {
             if ($options?._res?.headers) {
                 Object.entries($options._res.headers).forEach(
                     ([key, value]) => {
-                        res.set(key, value);
+                        if (value == null) {
+                            res.removeHeader(key);
+                        } else {
+                            res.set(key, value);
+                        }
                     },
                 );
             }
@@ -650,7 +654,11 @@ async function downloadCollection(req, res) {
             if ($options?._res?.headers) {
                 Object.entries($options._res.headers).forEach(
                     ([key, value]) => {
-                        res.set(key, value);
+                        if (value == null) {
+                            res.removeHeader(key);
+                        } else {
+                            res.set(key, value);
+                        }
                     },
                 );
             }

backend/src/restful/file.js

@@ -193,7 +193,11 @@ async function getFile(req, res, next) {
             if (output?.$options?._res?.headers) {
                 Object.entries(output.$options._res.headers).forEach(
                     ([key, value]) => {
-                        res.set(key, value);
+                        if (value == null) {
+                            res.removeHeader(key);
+                        } else {
+                            res.set(key, value);
+                        }
                     },
                 );
             }

backend/src/vendor/express.js

@@ -224,6 +224,11 @@ export default function express({ substore: $, port, host }) {
                 headers[key] = val;
                 return this;
             }
+
+            removeHeader(key) {
+                delete headers[key];
+                return this;
+            }
         })();
     }
 }