diff --git a/server/controllers/WebSocketController.js b/server/controllers/WebSocketController.js
index 8f0c4e8..6c2d338 100644
--- a/server/controllers/WebSocketController.js
+++ b/server/controllers/WebSocketController.js
@@ -1,4 +1,3 @@
-const fs = require('fs-extra');
 const _ = require('lodash');
 const WebSocket = require ('ws');
 
@@ -182,9 +181,9 @@ class WebSocketController {
         if (!this.config.allowRemoteLib)
             throw new Error('Remote lib access disabled');
 
-        const data = await fs.readFile(this.config.inpxFile, 'base64');
+        const result = await this.webWorker.getInpxFile(req);
 
-        this.send({data}, req, ws);
+        this.send(result, req, ws);
     }
 
 }
diff --git a/server/core/InpxHashCreator.js b/server/core/InpxHashCreator.js
index 8bda1d9..26a9b5f 100644
--- a/server/core/InpxHashCreator.js
+++ b/server/core/InpxHashCreator.js
@@ -23,6 +23,10 @@ class InpxHashCreator {
 
         return utils.getBufHash(joinedHash, 'sha256', 'hex');
     }
+
+    async getInpxFileHash() {
+        return await utils.getFileHash(this.config.inpxFile, 'sha256', 'hex');
+    }
 }
 
 module.exports = InpxHashCreator;
\ No newline at end of file
diff --git a/server/core/RemoteLib.js b/server/core/RemoteLib.js
index e5cd9da..5bd0238 100644
--- a/server/core/RemoteLib.js
+++ b/server/core/RemoteLib.js
@@ -4,6 +4,7 @@ const utils = require('./utils');
 
 const FileDownloader = require('./FileDownloader');
 const WebSocketConnection = require('./WebSocketConnection');
+const InpxHashCreator = require('./InpxHashCreator');
 const log = new (require('./AppLogger'))().log;//singleton
 
 //singleton
@@ -20,10 +21,9 @@ class RemoteLib {
 
             this.remoteHost = config.remoteLib.url.replace(/^ws:\/\//, 'http://').replace(/^wss:\/\//, 'https://');
 
-            this.inpxFile = `${config.tempDir}/${utils.randomHexString(20)}`;
-            this.lastUpdateTime = 0;
-
             this.down = new FileDownloader(config.maxPayloadSize*1024*1024);
+            this.inpxHashCreator = new InpxHashCreator(config);
+            this.inpxFileHash = '';
 
             instance = this;
         }
@@ -46,17 +46,16 @@ class RemoteLib {
         return response;
     }
 
-    async downloadInpxFile(getPeriod = 0) {
-        if (getPeriod && Date.now() - this.lastUpdateTime < getPeriod)
-            return this.inpxFile;
+    async downloadInpxFile() {
+        if (!this.inpxFileHash)
+            this.inpxFileHash = await this.inpxHashCreator.getInpxFileHash();
 
-        const response = await this.wsRequest({action: 'get-inpx-file'});
+        const response = await this.wsRequest({action: 'get-inpx-file', inpxFileHash: this.inpxFileHash});
 
-        await fs.writeFile(this.inpxFile, response.data, 'base64');
-
-        this.lastUpdateTime = Date.now();
-
-        return this.inpxFile;
+        if (response.data) {
+            await fs.writeFile(this.config.inpxFile, response.data, 'base64');
+            this.inpxFileHash = '';
+        }
     }
 
     async downloadBook(bookPath, downFileName) {
diff --git a/server/core/WebWorker.js b/server/core/WebWorker.js
index 759ae6e..41677cf 100644
--- a/server/core/WebWorker.js
+++ b/server/core/WebWorker.js
@@ -43,6 +43,9 @@ class WebWorker {
                 this.remoteLib = new RemoteLib(config);
             }
             
+            this.inpxHashCreator = new InpxHashCreator(config);
+            this.inpxFileHash = '';
+
             this.wState = this.workerState.getControl('server_state');
             this.myState = '';
             this.db = null;
@@ -136,6 +139,8 @@ class WebWorker {
             const config = this.config;
             const dbPath = `${config.dataDir}/db`;
 
+            this.inpxFileHash = await this.inpxHashCreator.getInpxFileHash();
+
             //пересоздаем БД из INPX если нужно
             if (config.recreateDb || recreate)
                 await fs.remove(dbPath);
@@ -427,6 +432,18 @@ class WebWorker {
         }
     }
 
+    async getInpxFile(params) {
+        let data = null;
+        if (params.inpxFileHash && this.inpxFileHash && params.inpxFileHash === this.inpxFileHash) {
+            data = false;
+        }
+
+        if (data === null)
+            data = await fs.readFile(this.config.inpxFile, 'base64');
+
+        return {data};
+    }
+
     logServerStats() {
         try {
             const memUsage = process.memoryUsage().rss/(1024*1024);//Mb
@@ -516,18 +533,16 @@ class WebWorker {
         if (!inpxCheckInterval)
             return;
 
-        const inpxHashCreator = new InpxHashCreator(this.config);
-
         while (1) {// eslint-disable-line no-constant-condition
             try {
                 while (this.myState != ssNormal)
                     await utils.sleep(1000);
 
                 if (this.remoteLib) {
-                    await this.remoteLib.downloadInpxFile(60*1000);
+                    await this.remoteLib.downloadInpxFile();
                 }
 
-                const newInpxHash = await inpxHashCreator.getHash();
+                const newInpxHash = await this.inpxHashCreator.getHash();
 
                 const dbConfig = await this.dbConfig();
                 const currentInpxHash = (dbConfig.inpxHash ? dbConfig.inpxHash : '');
diff --git a/server/index.js b/server/index.js
index 9f49286..5eeb084 100644
--- a/server/index.js
+++ b/server/index.js
@@ -114,9 +114,10 @@ async function init() {
             }
         }
     } else {
+        config.inpxFile = `${config.tempDir}/${utils.randomHexString(20)}`;
         const RemoteLib = require('./core/RemoteLib');//singleton
         const remoteLib = new RemoteLib(config);
-        config.inpxFile = await remoteLib.downloadInpxFile();
+        await remoteLib.downloadInpxFile();
     }
 
     config.recreateDb = argv.recreate || false;